Flowserve Guardian Sealless Metallic User Manual

USER INSTRUCTIONS

Guardian Sealless Metallic Pumps

ANSI Standard, Close-Coupled and Unitized Self-Primer

Single stage, end suction, centrifugal, chemical process
pumps

PCN=71569212 08-11 (E) (Based on P-20-502.)
Original instructions.

Installation

Operation

Maintenance

These instructions must be read prior to installing,

operating, using and maintaining this equipment.

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

CONTENTS

Page

1 INTRODUCTION AND SAFETY......................3

1.1 General .........................................................3

1.2 CE marking and approvals ...........................3

1.3 Disclaimer .....................................................3

1.4 Copyright.......................................................3

1.5 Duty conditions .............................................3

1.6 Safety............................................................4

1.7 Nameplate and warning labels .....................8

1.8 Specific machine performance......................8

1.9 Noise level ....................................................8

2 TRANSPORT AND STORAGE........................9

2.1 Consignment receipt and unpacking..............9

2.2 Handling........................................................9

2.3 Lifting.............................................................9

2.4 Storage........................................................10

2.5 Recycling and end of product life................11

3 DESCRIPTION...............................................11

3.1 Configurations.............................................11

3.2 Nomenclature..............................................11

3.3 Design of major parts..................................12

3.4 Performance and operation limits...............13

4 INSTALLATION..............................................16

4.1 Location ......................................................16

4.2 Part assemblies ..........................................16

4.3 Foundation..................................................16

4.4 Grouting ......................................................18

4.5 Initial alignment...........................................19

4.6 Piping..........................................................20

4.7 Electrical connections .................................27

4.8 Final shaft alignment check ........................28

4.9 Protection systems......................................28

6 MAINTENANCE.............................................35

6.1 Maintenance schedule................................36

6.2 Spare parts.................................................36

6.3 Recommended spares and consumables..37

6.4 Tools required.............................................37

6.5 Fastener torques ........................................37

6.6 Setting impeller clearance ..........................37

6.7 Disassembly ...............................................38

6.8 Examination of parts...................................44

6.9 Assembly of pump......................................47

7 FAULTS; CAUSES AND REMEDIES............56

8 PARTS LIST AND DRAWINGS.....................59

8.1 Cutaway – Guardian G & H Series – Group 1 –

long coupled ...............................................59

8.2 Cutaway - Guardian G & H Series - Group 2 –

long coupled ...............................................61

8.3 Cutaway - Guardian G & H Series - Group 1 –

close coupled..............................................63

9 CERTIFICATION ...........................................65

10 OTHER RELEVANT DOCUMENTATION AND

MANUALS......................................................65

10.1 Supplementary User Instructions.......65

10.2 Change notes.....................................65

10.3 Additional sources of information.......65

Page

5 COMMISSIONING, STARTUP, OPERATION

AND SHUTDOWN .........................................30

5.1 Pre-commission procedure.........................30

5.2 Pump lubricants ..........................................30

5.3 Impeller clearance.......................................31

5.4 Direction of rotation.....................................32

5.5 Guarding .....................................................32

5.6 Priming and auxiliary supplies ....................33

5.7 Starting the pump........................................34

5.8 Running or operation ..................................34

5.9 Stopping and shutdown ..............................34

5.10 Hydraulic, mechanical and electrical duty
35

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

1 INTRODUCTION AND SAFETY

1.1 General

These instructions must always be kept

close to the product's operating location or
directly with the product.

Flowserve products are designed, developed and
manufactured with state-of-the-art technologies in
modern facilities. The unit is produced with great
care and commitment to continuous quality control,
utilising sophisticated quality techniques, and safety
requirements.

Flowserve is committed to continuous quality
improvement and being at service for any further
information about the product in its installation and
operation or about its support products, repair and
diagnostic services.

These instructions are intended to facilitate
familiarization with the product and its permitted use.
Operating the product in compliance with these
instructions is important to help ensure reliability in
service and avoid risks. The instructions may not take
into account local regulations; ensure such regulations
are observed by all, including those installing the
product. Always coordinate repair activity with
operations personnel, and follow all plant safety
requirements and applicable safety and health
laws/regulations.

These instructions must read prior to

installing, operating, using and maintaining the
equipment in any region worldwide. The
equipment must not be put into service until all
the conditions relating to safety noted in the
instructions, have been met. Failure to follow and
apply the present user instructions is considered
to be misuse. Personal injury, product damage,
delay or failure caused by misuse are not covered
by the Flowserve warranty.

1.2 CE marking and approvals

It is a legal requirement that machinery and
equipment put into service within certain regions of
the world shall conform with the applicable CE
Marking Directives covering Machinery and, where
applicable, Low Voltage Equipment, Electromagnetic
Compatibility (EMC), Pressure Equipment Directive
(PED) and Equipment for Potentially Explosive
Atmospheres (ATEX).

Where applicable, the Directives and any additional
Approvals, cover important safety aspects relating to
machinery and equipment and the satisfactory
provision of technical documents and safety
instructions. Where applicable this document
incorporates information relevant to these Directives
and Approvals.
To confirm the Approvals applying and if the product
is CE marked, check the serial number plate
markings and the Certification, (See section 9,
Certification.)

1.3 Disclaimer

Information in these User Instructions is believed to
be complete and reliable. However, in spite of all of
the efforts of Flowserve Corporation to provide
comprehensive instructions, good engineering and
safety practice should always be used.

Flowserve manufactures products to exacting
International Quality Management System Standards as
certified and audited by external Quality Assurance
organisations. Genuine parts and accessories have
been designed, tested and incorporated into the
products to help ensure their continued product quality
and performance in use. As Flowserve cannot test
parts and accessories sourced from other vendors the
incorrect incorporation of such parts and accessories
may adversely affect the performance and safety
features of the products. The failure to properly select,
install or use authorised Flowserve parts and
accessories is considered to be misuse. Damage or
failure caused by misuse is not covered by the
Flowserve's warranty. In addition, any modification of
Flowserve products or removal of original components
may impair the safety of these products in their use.

1.4 Copyright

All rights reserved. No part of these instructions may
be reproduced, stored in a retrieval system or
transmitted in any form or by any means without prior
permission of Flowserve Pump Division.

1.5 Duty conditions

This product has been selected to meet the
specifications of your purchaser order. The
acknowledgement of these conditions has been sent
separately to the Purchaser. A copy should be kept
with these instructions.

The product must not be operated beyond

the parameters specified for the application. If
there is any doubt as to the suitability of the
product for the application intended, contact
Flowserve for advice, quoting the serial number.

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

If the conditions of service on your purchase order
are going to be changed (for example liquid pumped,
temperature or duty) it is requested that the user seek
written agreement of Flowserve before start up.

1.6 Safety

1.6.1 Summary of safety markings

These User Instructions contain specific safety
markings where non-observance of an instruction would
cause hazards. The specific safety markings are:

This symbol indicates electrical safety
instructions where non-compliance will involve a high
risk to personal safety or the loss of life.

This symbol indicates safety instructions where
non-compliance would affect personal safety and
could result in loss of life.

This symbol indicates “hazardous and toxic fluid”
safety instructions where non-compliance would affect
personal safety and could result in loss of life.

This symbol indicates safety
instructions where non-compliance will involve some
risk to safe operation and personal safety and would
damage the equipment or property.

This symbol indicates “strong magnetic
field” safety instructions where non-compliance would
affect personal safety, pacemakers, instruments, or
stored data sensitive to magnetic fields.

This symbol indicates explosive atmosphere
zone marking according to ATEX. It is used in safety
instructions where non-compliance in the hazardous
area would cause the risk of an explosion.

This symbol is used in safety instructions to
remind not to rub non-metallic surfaces with a dry
cloth; ensure the cloth is damp. It is used in safety
instructions where non-compliance in the hazardous
area would cause the risk of an explosion.

This sign is not a safety symbol but
indicates an important instruction in the assembly
process.

1.6.2 Personnel qualification and training

All personnel involved in the operation, installation,
inspection and maintenance of the unit must be
qualified to carry out the work involved. If the
personnel in question do not already possess the
necessary knowledge and skill, appropriate training
and instruction must be provided. If required the

operator may commission the manufacturer/supplier
to provide applicable training.

Always coordinate repair activity with operations and
health and safety personnel, and follow all plant
safety requirements and applicable safety and health
laws and regulations.

1.6.3 Safety action

This is a summary of conditions and actions to
prevent injury to personnel and damage to the
environment and to equipment. For products
used in potentially explosive atmospheres
section 1.6.4 also applies.

HIGH MAGNETIC FIELDS
Great care should be taken when assembling/
dismantling magnetic rotors, where fitted, because of
the very high forces which can be created by the
magnets.

Persons with pacemakers and any instrumentation
etc sensitive to magnetic fields should be kept well
away from the magnetic drive unit during
dismantling.

NEVER DO MAINTENANCE WORK

WHEN THE UNIT IS CONNECTED TO POWER

DRAIN THE PUMP AND ISOLATE PIPEWORK
BEFORE DISMANTLING THE PUMP
The appropriate safety precautions should be taken
where the pumped liquids are hazardous.

FLUOROELASTOMERS (When fitted.)
When a pump has experienced temperatures over
250 ºC (482 ºF), partial decomposition of
fluoroelastomers (example: Viton) will occur. In this
condition these are extremely dangerous and skin
contact must be avoided.

HANDLING COMPONENTS
Many precision parts have sharp corners and the
wearing of appropriate safety gloves and equipment
is required when handling these components. To lift
heavy pieces above 25 kg (55 lb) use a crane
appropriate for the mass and in accordance with
current local regulations.

NEVER OPERATE THE PUMP WITHOUT THE
COUPLING GUARD AND ALL OTHER SAFETY
DEVICES CORRECTLY INSTALLED

GUARDS MUST NOT BE REMOVED WHILE
THE PUMP IS OPERATIONAL

HOT (and cold) PARTS

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

If hot or freezing components or auxiliary heating
equipment can present a danger to operators and
persons entering the immediate area, action must be
taken to avoid accidental contact (such as shielding). If
complete protection is not possible, the machine access
must be limited to maintenance staff only with clear
visual warnings and indicators to those entering the
immediate area.

Bearing housings must not be insulated and

drive motors and bearings may be hot.

If the temperature is greater than 80 °C (175 °F) o r
below -5 °C (23 °F) in a restricted zone, or
exceeds local regulations, action as above shall
be taken.

THERMAL SHOCK
Rapid changes in the temperature of the liquid within
the pump can cause thermal shock, which can result
in damage or breakage of components and should be
avoided.

NEVER APPLY HEAT TO REMOVE IMPELLER
Trapped lubricant or vapor could cause an explosion.

ALWAYS USE THE JACKBOLTS TO
SEPARATE THE POWER END FROM THE WET
END ASSEMBLIES

PREVENT EXCESSIVE EXTERNAL
PIPE LOAD
Do not use pump as a support for piping. Do not
mount expansion joints, unless allowed by Flowserve
in writing, so that their force, due to internal pressure,
acts on the pump flange.

ENSURE CORRECT LUBRICATION
(See section 5, Commissioning, startup, operation
and shutdown.)

NEVER EXCEED THE MAXIMUM
DESIGN PRESSURE (MDP) AT THE TEMPERATURE
SHOWN ON THE PUMP NAMEPLATE
See section 3 for pressure versus temperature
ratings based on the material of construction.

NEVER OPERATE THE PUMP
WITH THE DISCHARGE VALVE CLOSED
(Unless otherwise instructed at a specific point in the
user instructions.)
See section 5, Commissioning start-up, operation and
shutdown.

immediate damage to the containment shell and
bearings.

NEVER OPERATE THE PUMP WITH
THE SUCTION VALVE CLOSED
It should be fully opened when the pump is running.

NEVER OPERATE THE PUMP AT
ZERO FLOW OR FOR EXTENEDED PERIODS
BELOW THE MINIMUM CONTINUOUS FLOW

DO NOT START THE PUMP

WITHOUT PROPER LUBRICATION
Refer to bearing lubrication in Section 5.2.

THE PUMP SHAFT MUST TURN
CLOCKWISE WHEN VIEWED FROM THE MOTOR
END
It is absolutely essential that the rotation of the motor
be checked before installation of the coupling spacer
and starting the pump. Incorrect rotation of the pump
for even a short period can unscrew the impeller,
which can cause significant damage.

GUARDIAN G & H SERIES PUMPS
ARE SIZED BASED ON A SPECIFIC APPLICATION.
In the event the user elects to operate this pump in a
service other than what it was originally sized for, a
Flowserve sales engineer should be contacted to
evaluate the new application.

DO NOT RUN THE PUMP AT
ABNORMALLY HIGH OR LOW FLOW RATES
Operating at a flow rate higher than normal or at a flow
rate with no back pressure on the pump may overload
the motor and cause cavitation. Low flow rates may
cause a reduction in pump/bearing life, overheating of
the pump, instability and cavitation/vibration.

EXCESSIVE PUMP NOISE OR
VIBRATION
This may indicate a dangerous condition. The pump
must be shut down immediately.

HAZARDOUS LIQUIDS
When the pump is handling hazardous liquids care
must be taken to avoid exposure to the liquid by
appropriate pump placement, limiting personnel
access and by operator training. If the liquid is
flammable and/or explosive, strict safety procedures
must be applied.

NEVER RUN THE PUMP DRY
OR WITHOUT PROPER PRIME (Casing Flooded)
Operating the magnetic coupling dry may cause

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Temperature class

Temperature class

1.6.4 Products used in potentially explosive

atmospheres

Measures are required to:

• Avoid excess temperature

• Prevent build up of explosive mixtures

• Prevent the generation of sparks

• Prevent leakages

• Maintain the pump to avoid hazard

The following instructions for pumps and pump units
when installed in potentially explosive atmospheres
must be followed to help ensure explosion protection.
For ATEX, both electrical and non-electrical equipment
must meet the requirements of European Directive
94/9/EC. . Always observe the regional legal Ex
requirements eg Ex electrical items outside the EU may
be required certified to other than ATEX eg IECEx, UL.

1.6.4.1 Scope of compliance

Use equipment only in the zone for which it is
appropriate. Always check that the driver, drive
coupling assembly, and pump equipment are suitably
rated and/or certified for the classification of the
specific atmosphere in which they are to be installed.

Where Flowserve has supplied only the bare shaft
pump, the Ex rating applies only to the pump. The
party responsible for assembling the pump set shall
select the coupling, driver, and any additional
equipment, with the necessary CE Certificate/
Declaration of Conformity establishing it is suitable for
the area in which it is to be installed.

The output from a variable frequency drive (VFD) can
cause additional heating effects in the motor. On pump
sets controlled by a VFD, the ATEX Certification for the
motor must state that it covers the situation where
electrical supply is from the VFD. This particular
requirement still applies even if the VFD is in a safe area.

1.6.4.2 Marking

An example of ATEX equipment marking is shown
below. The actual classification of the pump will be
engraved on the nameplate.

II 2 GD c IIC 135 ºC (T4)

Equipment Group
I = Mining
II = Non-mining

Category
2 or M2 = high level protection
3 = normal level of protection

Gas and/or dust
G = Gas
D = Dust

c = Constructional safety

(in accordance with EN13463-5)
Gas Group
IIA – Propane (typical)
IIB – Ethylene (typical)
IIC – Hydrogen (typical)

Maximum surface temperature (Temperature Class)
(see section 1.6.4.3.)

1.6.4.3 Avoiding excessive surface

temperatures

ENSURE THE EQUIPMENT TEMPERATURE

CLASS IS SUITABLE FOR THE HAZARD ZONE
Pumps have a temperature class as stated in the ATEX

Ex rating on the nameplate. These are based on a
maximum ambient temperature of 40 °C (104 °F).
Refer to Flowserve for higher ambient temperatures.

Maximum permitted liquid temperature for pumps

to EN13463-1

T6
T5
T4
T3
T2

Maximum surface

temperature permitted

85 °C (185 °F)
100 °C (212 °F)
135 °C (275 °F)
200 °C (392 °F)
300 °C (572 °F)

Temperature limit of

liquid handled

Consult Flowserve
Consult Flowserve

115 °C (239 °F) *
180 °C (356 °F) *
275 °C (527 °F) *

Maximum permitted liquid temperature for pumps
with self priming casing

to EN13463-1

T6
T5
T4
T3
T2

* The tables only takes the ATEX temperature class into consideration.

Pump design or material, as well as component design or material, may
further limit the maximum working temperature of the liquid.

Maximum surface

temperature permitted

85 °C (185 °F)

100 °C(212 °F)
135 °C (275 °F)
200 °C (392 °F)
300 °C (572 °F)

Temperature limit of

liquid handled

Consult Flowserve
Consult Flowserve

110 °C (230 °F) *
175 °C (347 °F) *
270 °C (518 °F) *

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The responsibility for compliance with the specified
maximum liquid temperature is with the plant
operator.

Temperature classification “Tx” is used when the
liquid temperature varies and the pump could be
installed in different hazardous atmospheres. In this
case the user is responsible for ensuring that the
pump surface temperature does not exceed that
permitted in the particular hazardous atmosphere.

Do not attempt to check the direction of rotation with the
coupling spacer fitted due to the risk of severe contact
between rotating and stationary components.

Where there is any risk of the pump being run against a
closed valve generating high liquid and casing external
surface temperatures fit an external surface
temperature protection device.

Avoid mechanical, hydraulic or electrical overload by
using motor overload trips or a power monitor and
perform routine vibration monitoring.

In dirty or dusty environments, make regular checks
and remove dirt from areas around close clearances,
bearing housings and motors.

Additional requirements for self-priming casing
pumps

Where the system operation does not ensure control of
priming, as defined in the User Instructions, and the
maximum permitted surface temperature of the T Class
could be exceeded, the user shall install an external
surface temperature protection device.

1.6.4.4 Preventing the build up of explosive
mixtures

ENSURE PUMP IS PROPERLY FILLED AND

VENTED AND DOES NOT RUN DRY
Ensure that the pump and relevant suction and

discharge piping is totally filled with liquid at all times
during the pumps operation so that an explosive
atmosphere is prevented. In addition, it is essential
to make sure that any heating and cooling systems
are properly filled.

If the operation of the system can not avoid this
condition fit an appropriate dry run protection device
(example: liquid detection or a power monitor).

To avoid potential hazards from fugitive emissions of
vapor or gas to atmosphere, the surrounding area
must be well ventilated.

1.6.4.5 Preventing sparks

To prevent a potential hazard from mechanical
contact, the coupling guard must be non-sparking for
category 2 equipment.

To avoid the potential hazard from random induced
current generating a spark, the baseplate must be
properly grounded.

Avoid electrostatic charge. Do not rub non­metallic surfaces with a dry cloth; ensure the cloth is
damp.

For ATEX the coupling must be selected to comply
with 94/9/EC. Correct alignment must be maintained.

Additional requirements for pumps on non­metallic baseplates

When metallic components are fitted on a non­metallic baseplate they must be individually earthed.

1.6.4.6 Preventing leakage

The pump must only be used to handle liquids
for which it has been approved to have the correct
corrosion resistance.

Avoid entrapment of liquid in the pump and associated
piping due to closing of suction and discharge valves,
which could cause dangerous excessive pressures to
occur if there is heat input to the liquid. This can occur if
the pump is stationary or running.

Bursting of liquid containing parts due to freezing
must be avoided by draining or protecting the pump
and auxiliary systems.

Where there is the potential hazard of a loss of
external flush, the fluid must be monitored.

If leakage of liquid to atmosphere can result in a
hazard, install a liquid detection device.

1.6.4.7 Maintenance to avoid a hazard

CORRECT MAINTENANCE IS REQUIRED TO
AVOID POTENTIAL HAZARDS WHICH GIVE A
RISK OF EXPLOSION

The responsibility for compliance with maintenance
instructions is with the plant operator.

To avoid potential explosion hazards during
maintenance, the tools, cleaning and painting
materials used must not give rise to sparking or

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

adversely affect the ambient conditions. Where there
is a risk from such tools or materials, maintenance
must be conducted in a safe area.

It is recommended that a maintenance plan and
schedule be implemented. See section 6, Maintenance.

1.7 Nameplate and warning labels

1.7.1 Nameplate

For details of nameplate, see Declaration of
Conformity and section 3.

1.7.2 Warning labels

1.9 Noise level

Attention must be given to the exposure of personnel
to the noise, and local legislation will define when
guidance to personnel on noise limitation is required,
and when noise exposure reduction is mandatory.
This is typically 80 to 85 dBA.

The usual approach is to control the exposure time to
the noise or to enclose the machine to reduce emitted
sound. You may have already specified a limiting
noise level when the equipment was ordered,
however if no noise requirements were defined, then
attention is drawn to the following table to give an
indication of equipment noise level so that you can
take the appropriate action in your plant.

Pump noise level is dependent on a number of
operational factors, flow rate, pipework design and
acoustic characteristics of the building, and so the
values given are subject to a 3 dBA tolerance and
cannot be guaranteed.

Similarly the motor noise assumed in the “pump and
motor” noise is that typically expected from standard
and high efficiency motors when on load directly driving
the pump. Note that a motor driven by an inverter may
show an increased noise at some speeds.

If a pump unit only has been purchased for fitting with
your own driver then the “pump only” noise levels in the
table should be combined with the level for the driver
obtained from the supplier. Consult Flowserve or a
noise specialist if assistance is required in combining
the values.

For units driven by equipment other than electric

motors or units contained within enclosures, see the

Oil lubricated units only

1.8 Specific machine performance

For performance parameters see section 1.5, Duty
conditions. Where performance data has been supplied

separately to the purchaser these should be obtained
and retained with these User Instructions if required.

Page 8 of 68 flowserve.com

accompanying information sheets and manuals.
It is recommended that where exposure approaches

the prescribed limit, then site noise measurements
should be made.

The values are in sound pressure level LpA at 1 m
(3.3 ft) from the machine, for “free field conditions
over a reflecting plane”.

For estimating sound power level LWA (re 1 pW) then
add 14 dBA to the sound pressure value.

Motor size
and speed

kW (hp)

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Typical sound pressure level, LpA at 1 m reference 20 µPa (dBA)

3550 r/min 2900 r/min 1750 r/min 1450 r/min

Pump

only

Pump and

motor

Pump

only

Pump and

motor

Pump

only

Pump and

motor

Pump

only

Pump and

motor

<0.55 (<0.75)

0.75 (1)

1.1 (1.5)

1.5 (2)

2.2 (3)
3 (4)
4 (5)

5.5 (7.5)

7.5 (10)
11 (15)
15 (20)

18.5 (25)
22 (30)
30 (40)
37 (50)
45 (60)
55 (75)

75 (100)

Note: for 1 180 and 960 r/min reduce 1 450 r/min values by 2 dBA. For 880 and 720 r/min reduce 1 450 r/min values by 3 dBA.

72 72 64 65 62 64 62 64
72 72 64 66 62 64 62 64
74 74 66 67 64 64 62 63
74 74 66 71 64 64 62 63
75 76 68 72 65 66 63 64
75 76 70 73 65 66 63 64
75 76 71 73 65 66 63 64
76 77 72 75 66 67 64 65
76 77 72 75 66 67 64 65
80 81 76 78 70 71 68 69
80 81 76 78 70 71 68 69
81 81 77 78 71 71 69 71
81 81 77 79 71 71 69 71
83 83 79 81 73 73 71 73
83 83 79 81 73 73 71 73
86 86 82 84 76 76 74 76
86 86 82 84 76 76 74 76
87 87 83 85 77 77 75 77

2 TRANSPORT AND STORAGE

2.3 Lifting

2.1 Consignment receipt and unpacking

Immediately after receipt of the equipment it must be
checked against the delivery/shipping documents for
its completeness and that there has been no damage
in transportation. Any shortage and/or damage must
be reported immediately to Flowserve and must be
received in writing within 10 days of receipt of the
equipment. Later claims cannot be accepted.

Check all crates, boxes or wrappings for any
accessories or spare parts that may be packed
separately from the equipment or attached to side
walls of the box or equipment.

Each product has a unique serial number. Check
that this number corresponds with that advised and
quote this number in correspondence as well as
when ordering spare parts or further accessories.

2.2 Handling

Boxes, crates, pallets or cartons may be unloaded
using fork-lift vehicles or slings depending on their
size and construction.

lifting lugs or eye bolts. These are intended for use in
only lifting the individual piece of equipment. NEVER

use eye bolts or cast-in lifting lugs to lift pump,
motor and baseplate assemblies.

A crane must be used for all pump sets in
excess of 25 kg (55 lb). Fully trained personnel must
carry out lifting in accordance with local regulations.
The driver and pump weights are recorded on their
respective nameplates.

or assemblies above the center of gravity to prevent
the unit from flipping. The angle between slings or
ropes used for lifting must never exceed 60°.

2.3.1 Lifting pump components

2.3.1.1 Casing [1100]

Use a choker hitch pulled tight around the discharge
nozzle.

2.3.1.2 Bearing housing [3200]

Insert either a sling or hook through the lifting lug

Pumps and motors often have integral

Care must be taken to lift components

located on the top of the housing.

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

2.3.1.3 Power end

Same as bearing housing.

To avoid distortion, the pump unit

should be lifted as shown.

2.3.1.4 Bare pump

Sling around the pump discharge nozzle and around
the outboard end of the bearing housing with
separate slings. Choker hitches must be used at
both attachment points and pulled tight. Make sure
the completion of the choker hitch on the discharge
nozzle is toward the coupling end of the pump shaft
as shown in Figure 2-1. The sling lengths should be
adjusted to balance the load before attaching the
lifting hook.

Figure 2.1

Figure 2.3

The sling should be positioned so the weight is not
carried through the motor fan housing. Make sure the
completion of the choker hitch on the discharge
nozzle is toward the coupling end of the pump shaft
as shown in Figure 2-1.

2.4 Storage

2.3.1.5 Lifting pump, motor and baseplate
assembly

If the baseplate has lifting holes cut in the sides at the
end insert lifting S hooks at the four corners and use
slings or chains to connect to the lifting eye as shown in
Figure 2-2. Do not use slings through the lifting holes.

Figure 2.2

For other baseplates, sling around the pump discharge
nozzle, and around the outboard end of the motor frame
using choker hitches pulled tight. (Figure 2-1.)

Store the pump in a clean, dry location
away from vibration. Leave flange covers in place to
keep dirt and other foreign material out of pump
casing. Turn the pump shaft at regular intervals to
prevent brinelling of the bearings.

The pump may be stored as above for up to 6
months. Consult Flowserve for preservative actions
when a longer storage period is needed.

2.4.1 Short term storage

Normal packaging is designed to protect the pump
and parts during shipment and for dry, indoor storage
for up to six months or less. The following is an
overview of our normal packaging:

• All loose unmounted items are packaged in a

water proof plastic bag and placed under the
coupling guard. Larger items are boxed and
metal banded to the baseplate. For pumps not
mounted on a baseplate, the bag and/or box is
placed inside the shipping container.

• Inner surfaces of the bearing housing, shaft (area

through bearing housing) and bearings are coated
with Cortec VCI-329 rust inhibitor, or equal.

Bearing housings are not filled with oil

prior to shipment.)

Page 10 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Serial No.

Equipment No.

Purchase

• The internal surfaces of ferrous casings, covers,
flange faces, and the impeller surface are
sprayed with Cortec VCI-389, or equal.

• Exposed shafts are taped with Polywrap.

• Flange covers are secured to both the suction

and discharge flanges.

• Assemblies ordered with external piping, in some
cases components may be disassembled for
shipment.

• The pump must be stored in a covered, dry
location.

2.4.2 Long term storage

Long term storage is defined as more than six
months, but less than 12 months. The procedure
Flowserve follows for long term storage of pumps is
given below. These procedures are in addition to the
short term procedure:

• Each assembly is hermetically (heat) sealed from
the atmosphere by means of tack wrap sheeting
and rubber bushings (mounting holes).

• Desiccant bags are placed inside the tack
wrapped packaging.

• A solid wood box is used to cover the assembly.

This packaging will provide protection for up to twelve
months from humidity, salt laden air, dust etc.

After unpacking, protection will be the responsibility of
the user. Addition of oil to the bearing housing will
remove the inhibitor. If units are to be idle for extended
periods after addition of lubricants, inhibitor oils and
greases should be used. Every three months, the pump
shaft should be rotated approximately 10 revolutions.

2.5 Recycling and end of product life

At the end of the service life of the product or its
parts, the relevant materials and parts should be
recycled or disposed of using an environmentally
acceptable method and in accordance with local
regulations. If the product contains substances that
are harmful to the environment, these should be
removed and disposed of in accordance with current
local regulations. This also includes the liquids
and/or gases that may be used in the "seal system"
or other utilities.

Make sure that hazardous substances are
disposed of safely and that the correct personal
protective equipment is used. The safety
specifications must be in accordance with the current
local regulations at all times.

3 DESCRIPTION

3.1 Configurations

The Durco G and H Series Magnetic Drive chemical
process pump are end suction, single stage,
centrifugal pumps. The horizontal family conforms to
ASME B73.3M, which has a centerline discharge and
is represented by our Standard long-coupled, Close­coupled (Group 1 only), and Unitized self-priming
variants.

3.2 Nomenclature

The pump size will be engraved on the nameplate
typically as below:

BG 1.5 x 1 - 62/5.00 RV

• “BG” refers to the magnetic coupling size – see
Table 3-2.

• “1.5” refers to the suction diameter (1.5 in.)

• “1” refers to the discharge diameter (1.0 in.)

• “62” refers to nominal impeller diameter (6 & 2/8 in.)

• “5.00” refers to actual impeller diameter (5.00 in)

• “RV” refers to Reverse Vane impeller. (Open

impeller design not available on Guardian G & H
series pumps.)

Pump design variation:

A = This pump has been redesigned from an earlier

version. The impeller and casing are no longer
interchangeable with the earlier version.

H = This pump is designed for a higher flow capacity

than another pump with the same basic
designation. (Examples: 4X3-10 and 4X3-10H;
6X4-10 and 6X4-10H).

An example of the nameplate used on the Guardian
G & H Series pump is shown below. This nameplate,
which is always mounted on the Guardian G & H
Series bearing housing, is shown in Figure 3-1.

Figure 3.1: Nameplate

Serial No.

Equipment No.

Purchase Order

Date DD/MMM/YY

Model

Size

MDP

Material

Page 11 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

3.3 Design of major parts

3.3.1 Pump casing and impeller

Removal of the casing is not required when
performing maintenance of the rotating element. The
pump is designed with a gasket perpendicular to the
shaft allowing the rotating element to be easily
removed (back pull out). The impeller is reverse
vane; there is no option for an open impeller.

3.3.2 Magnetic coupling

See Figure 3-2 for magnetic coupling static torque
values. Outer and inner magnets are separated by a
containment shell which isolates the process fluid
from the atmosphere. When the motor drives the
outer magnet, the attraction between the outer and
inner magnet causes the pump shaft and impeller to
rotate. See Figure 3-3. This “magnetic coupling” is
produced by alternating polarities between the
magnet pairs on the inner and outer magnet
assemblies. The alternating magnet polarity also
causes repulsion between adjacent magnets and
prevents the coupling from slipping or decoupling.
(See Figure 3-4.)

Figure 3-2: Magnetic coupling static torque
values

Pump

size

Group

1

Group

2

Figure 3-3: Magnetic drive schematic (shaded
areas rotate)

Pump
prefix

AG/AH 0.5 in. 12 (110)
BG/BH 1.0 in. 33 (290)
CG/CH 1.5 in. 57 (500)
DG/DH 2.0 in. 75 (660)

JG/JH 2.5 in. 92 (810)
JG/JH 0.5 in. 23 (200)

KG/KH 1.0 in. 57 (500)

LG/LH 1.5 in. 99 (870)

MG/MH 2.0 in. 138 (1220)

NG/NH 2.5 in. 175 (1540)
PG/PH 3.0 in. 220 (1940)

QG/QH 3.5 in. 257 (2270)

Magnet

length

Torque at 20 ºC (68 ºF)

Nm (lbf٠in.)

Figure 3-4: Magnetic coupling

3.3.3 Inner rotating assembly

The wetted, inner rotating assembly consisting of the
inner magnet, pump shaft and impeller is supported
radially by bushings. The bushings also carry radial and
axial loading from the impeller. A small amount of
process fluid circulates in the containment area to
lubricate these bearings and cool the containment shell.

3.3.4 Lubrication and cooling path

Referring to Figure 3-5, the process fluid enters the
containment area through two lubrication holes in the
bearing holder (A). The fluid is divided at this point
with a small portion providing lubrication to the
inboard bushing and thrust journal before returning to
low pressure (B). The remaining portion moves
across the outboard bushing (C) at which point it is
divided with a portion lubricating the outboard thrust
journal (D) and the remaining passing through holes
in the inner magnet assembly (E). The process fluid
cools the containment shell (F) before mixing with
flow entering from two holes in the bearing holder
(G). The mixed flow then returns to the process flow
through the two return lubrication holes (H).

Two of the holes in the bearing holder (G) are located
at the six and twelve o’clock position to vent and drain
the containment area during startup and shutdown.

This circulation path ensures positive flow and
lubrication to the bushings and thrust journals with the
coolest fluid, i.e. before cooling the containment shell.

Page 12 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 3-5: Lubrication and cooling path

3.3.5 Power end bearings and lubrication

Ball bearings are fitted as standard on long-coupled
pumps and may be either oil or grease lubricated.
Close coupled pumps utilize the motor bearings for
support of the outer magnet.

3.3.6 Bearing housing

Large oil bath reservoir. (Long-coupled pumps only.)

3.3.7 Driver

The driver is normally an electric motor. Different drive
configurations may be fitted such as internal combustion
engines, turbines, hydraulic motors etc driving via
couplings, belts, gearboxes, drive shafts etc.

3.3.8 Accessories

Accessories may be fitted when specified by the
customer.

3.4 Performance and operation limits

This product has been selected to meet the
specification of your purchase order see section 1.5.

The following data is included as additional
information to help with your installation. It is typical,
and factors such as liquid being pumped,
temperature, and material of construction may
influence this data. If required, a definitive statement
for your application can be obtained from Flowserve.

3.4.1 General temperature limits

See Figures 3-6 and 3-7 for general temperature
limits for Guardian G & H series pumps.

3.4.2 Pressure-temperature ratings

The pressure-temperature ratings for Guardian G & H
series pumps are shown in Figures 3-9A and 3-9B.
To determine which casing material group to
reference, identify the appropriate casing “Material
Group No.” in Figure 3-8. Interpolation may be used
to find the pressure rating for a specific temperature.

The maximum discharge pressure must be less
than or equal to the P-T rating. Discharge pressure
may be approximated by adding the suction pressure
and the differential head developed by the pump.
The suction pressure limit for Guardian G & H series
pumps is limited by the P-T rating.

Example. The pressure temperature rating for a
Guardian pump with Class 300 flanges and CF8M
construction at an operating temperature of 149 ˚C is
found as follows:
a) From Figure 3-8, the correct material group for

CF8M is 2.2.

b) From Figure 3-9B, the pressure-temperature

rating is 21.5 bar.

3.4.3 Alloy cross reference chart

Figure 3-8 is the alloy cross-reference chart for all
Guardian G & H series pumps.

3.4.4 Minimum continuous flow

The minimum continuous flow (MCF) is based on a
percentage of the best efficiency point (BEP). Figure
3-10 identifies the MCF for all G & H series Guardian
pumps.

3.4.5 Minimum suction pipe submergence

The minimum submergence for Unitized self-priming
pumps is shown in Figure 3-11 and 3-12.

Page 13 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 3-6: Temperature limitations, long coupled
pumps

Temperature Limitations

• G or H Series acceptable

• Group 1 or 2 pumps acceptable

-73 ºC to -29 ºC

(-100 ºF to -20 ºF)

-29 ºC to 121 ºC

(-20 ºF to 250 ºF)

121 ºC to 177 ºC

(250 ºF to 350 ºF)

177 ºC to 287 ºC

(350 ºF to 550 ºF)

• Review material and elastomer
limitations

• Replace iron and steel pressure
containing components with
stainless steel. Contact your
Flowserve representative for details

• G or H Series acceptable

• Group 1 or 2 pumps acceptable

• Review material and elastomer

limitations

• H Series only

• Group 1 or 2 pumps acceptable

• Review material and elastomer

limitations

• H Series only

• Group 1 rated to 287 ºC (550 ºF)

• Group 2 rated to 232 ºC (450 ºF)!

• Review material and elastomer

limitations

• Centerline mounting recommended
for services over 177 ºC (350 ºF)

• Labyrinth seals recommended for
services over 218 ºC (425 ºF)

• Finned oil cooler recommended for
services over 190 ºC (375 ºF)

Figure 3-7: Temperature limitations, close
coupled pumps (Group 1 only)

Temperature Limitations

• G or H Series acceptable

• Review material and elastomer

-73 ºC to -29 ºC

(-100 ºF to -20 ºF)

-29 ºC to 121 ºC

(-20 ºF to 250 ºF)

121 ºC to 177 ºC

(250 ºF to 350 ºF)

177 ºC to 204 ºC

(350 ºF to 400 ºF)

limitations

• Replace iron and steel pressure
containing components with stainless
steel. Contact your Flowserve
representative for details

• G or H Series acceptable

• Review material and elastomer

limitations

• H Series only

• Review material and elastomer

limitations

• H Series only

• Maximum allowable process fluid

temperature is 204 ºC (400 ºF)

• Review material and elastomer
limitations

• Centerline mounting recommended
for services over 177 ºC (350 ºF)

Figure 3-8: Alloy cross-reference chart

Flowserve

material code

E3020 Ductile iron DCI None None A395, Gr. 60-40-18 1.0
E3033 High chrome iron CR28 None None A532 class 3 Cr
E4027 High chrome iron CR29 None None None Cr
E4028 High chrome iron CR35 None None None Cr
C3009 Carbon steel DS None Carbon steel A216 Gr. WCB 1.1
C3062 Durco CF8 D2 CF8 304 A744, Gr. CF8 2.1
C3069 Durco CF3 D2L CF3 304L A744, Gr. CF3 2.1
C3063 Durco CF8M D4 CF8M 316 A744, Gr. CF8M 2.2
C3067 Durco CF3M D4L CF3M 316L A744, Gr. CF3M 2.2
C3107 Durcomet 100 CD4M CD4MCuN
C4028 Durimet 20 D20 CN7M Alloy 20 A744, Gr. CN7M 3.17
C4029 Durcomet 5 DV None None None 2.2
K3005 Durco CY40 DINC CY40
K3007 Durco M35 DMM M351
K3008 Nickel DNI CZ100 Nickel 200 A494, Gr. CZ100 3.2
K4007 Chlorimet 2 DC2 N7M
K4008 Chlorimet 3 DC3 CW6M
E3042
E4035
H3004 Titanium Ti None Titanium B367, Gr. C3 Ti
H3005 Titanium-Pd TiP None Titanium-Pd B367, Gr. C8A Ti
H3007 Zirconium Zr None Zirconium B752, Gr. 702C Ti

 Duriron, Durichlor 51 and Superchlor are registered trademarks of Flowserve Corporation.
 Ferralium is a registered trademark of Langley Alloys.
 Hastelloy is a registered trademark of Haynes International, Inc.
 Inconel and Monel are registered trademarks of International Nickel Co. Inc.

Note: some materials listed above may not be available for use in some parts of Guardian pumps.

Designation

Durichlor 51
Superchlor

Durco legacy

codes

D51 None None A518, Gr. 2 No load
SD51 None None A518, Gr. 2 No load

ACI

designation

Equivalent wrought

designation

Ferralium

Inconel 600
Monel 400

Hastelloy B
Hastelloy C

ASTM

specifications

A995, Gr. CD4MCuN 2.8

A494, Gr. CY40 3.5
A494, Gr. M35-1 3.4

A494, Gr. N7M 3.7
A494, Gr. CW6M 3.8

Group No.

Material

Page 14 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 3-9A: All Guardian G & H series pumps with class 150 flanges

Temp

ºC

( ºF)

-73

(-100)

-29

(-20)

-18
(0)

38

(100)

93

(200)

149

(300)

171

(340)

204

(400)

260

(500)

316

(600)

1.0 1.1 2.1 2.2 2.8 3.2 3.4 3.5 3.7 3.8 3.17 Ti Cr

–

17.2

(250)

17.2

(250)

17.2

(250)

16.2

(235)

14.8

(215)

14.4

(209)

13.8

(200)

11.7

(170)

9.7

(140)

–

19.7

(285)

19.7

(285)

19.7

(285)

17.9

(260)

15.9

(230)

15.0

(218)

13.8

(200)

11.7

(170)

9.7

(140)

19.0

(275)

19.0

(275)

19.0

(275)

19.0

(275)

15.9

(230)

14.1

(205)

13.7

(199)

13.1

(190)

11.7

(170)

9.7

(140)

19.0

(275)

19.0

(275)

19.0

(275)

19.0

(275)

16.2

(235)

14.8

(215)

14.3

(207)

13.4

(195)

11.7

(170)

9.7

(140)

19.7

(285)

19.7

(285)

19.7

(285)

19.7

(285)

17.9

(260)

15.9

(230)

15.0

(218)

13.8

(200)

11.7

(170)

9.7

(140)

Material Group No.

bar (psi)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

9.7

(140)

15.9

(230)

15.9

(230)

15.9

(230)

15.9

(230)

13.8

(200)

13.1

(190)

13.0

(188)

12.8

(185)

11.7

(170)

9.7

(140)

15.2

(220)

15.2

(220)

15.2

(220)

15.2

(220)

13.8

(200)

12.4

(180)

12.1

(176)

11.7

(170)

11.0

(160)

9.7

(140)

20.0

(290)

20.0

(290)

20.0

(290)

20.0

(290)

17.9

(260)

15.9

(230)

15.0

(218)

13.8

(200)

11.7

(170)

9.7

(140)

20.0

(290)

20.0

(290)

20.0

(290)

20.0

(290)

17.9

(260)

15.9

(230)

15.0

(218)

13.8

(200)

11.7

(170)

9.7

(140)

15.9

(230)

15.9

(230)

15.9

(230)

15.9

(230)

13.8

(200)

12.4

(180)

11.9

(172)

11.0

(160)

10.3

(150)

9.7

(140)

20.0

(290)

20.0

(290)

20.0

(290)

20.0

(290)

17.9

(260)

15.9

(230)

15.0

(218)

13.8

(200)

11.7

(170)

9.7

(140)

–

–

12.6

(183)

12.6

(183)

12.6

(183)

12.6

(183)

12.6

(183)

–

–

–

Figure 3-9B: All Guardian G & H series pumps with class 300 flanges

Temp

ºC

( ºF)

-73

(-100)

-29

(-20)

-18
(0)

38

(100)

93

(200)

149

(300)

204

(400)

260

(500)

316

(600)

Note: temperature limitations in these charts take into account material choice only. Actual temperature limitations of the Guardian pump

may be different depending on pump size, model, or elastomers used. Refer to Section 3.4.1 for specific temperature limitations of
Guardian pumps independent of material choice.

1.0 1.1 2.1 2.2 2.8 3.2 3.4 3.5 3.7 3.8 3.17 Ti

– –

24.1

(350)

24.1

(350)

24.1

(350)

22.6

(328)

21.3

(309)

19.8

(287)

18.7

(271)

17.5

(254)

24.1

(350)

24.1

(350)

24.1

(350)

22.0

(319)

21.4

(310)

20.7

(300)

19.6

(284)

17.9

(260)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

20.1

(292)

18.1

(263)

16.6

(241)

15.3

(222)

14.6

(211)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

20.8

(301)

18.8

(272)

17.3

(250)

16.1

(233)

15.1

(219)

(350)

(350)

(350)

(350)

(336)

(310)

(287)

(268)

(259)

Material Group No.

24.1
(252)

24.1
(252)

24.1
(252)

24.1
(252)

23.2
(252)

21.4
(252)

19.8
(252)

18.5
(252)

17.9
(252)

bar (psi)

17.4

17.4

17.4

17.4

17.4

17.4

17.4

17.4

17.4

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

21.3

(309)

19.9

(289)

19.3

(280)

19.1

(277)

19.1

(277)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

22.9

(332)

21.4

(310)

19.9

(288)

19.3

(280)

19.2

(278)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

23.5

(341)

22.7

(329)

21.4

(310)

19.5

(282)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

23.5

(341)

22.7

(329)

21.4

(310)

19.5

(282)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

20.9

(303)

18.7

(271)

16.9

(245)

15.7

(228)

14.5

(210)

24.1

(350)

24.1

(350)

24.1

(350)

24.1

(350)

21.4

(310)

18.7

(271)

15.9

(231)

13.2

(191)

10.5

(152)

Page 15 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 3-10: Minimum continuous flow

MCF % of BEP

Pump size

1K3x2-6 20 % 10 % 10 %
2K3x2-8 20 % 10 % 10 %
2K4x3-8 20 % 10 % 10 %
2K3x2-10 30 % 10 % 10 %
2K4x3-10 30 % 10 % 10 %
2K6x4-10 40 % 10 % 10 %
2K6x4-10H n.a. 20 % 10 %
2K3x1.5-13 30 % 10 % 10 %
2K3x2-13 40 % 10 % 10 %
2K4x3-13 40 % 20 % 10 %
2K6x4-13 60 % 40 % 10 %
All other sizes 10 % 10 % 10 %

3 500/2 900

r/min

1 750/1 450

r/min

1 180/960

r/min

Figure 3-11: Minimum submergence

Figure 3-12: Minimum submergence

4 INSTALLATION

4.1 Location

The pump should be located to allow room for
access, ventilation, maintenance, and inspection with
ample headroom for lifting and should be as close as
practicable to the supply of liquid to be pumped.

Refer to the general arrangement drawing for the
pump set.

4.2 Part assemblies

The supply of motors and baseplates are optional.
As a result, it is the responsibility of the installer to
ensure that the motor is assembled to the pump and
aligned as detailed in section 4.5 and 4.8.

4.3 Foundation

Protection of openings and threads

When the pump is shipped, all threads and all
openings are covered. This protection/covering
should not be removed until installation. If, for any
reason, the pump is removed from service, this
protection should be reinstalled.

4.3.1 Rigid baseplates - overview

The function of a baseplate is to provide a rigid
foundation under a pump and its driver that maintains
alignment between the two. Baseplates may be
generally classified into two types:

• Foundation-mounted, grouted design (Figure 4-1)

• Stilt mounted, or free-standing (Figure 4-2)

Figure 4-1: Foundation mounted baseplate

3.4.6 Viscosity limitations

The allowable viscosity range for Guardian G & H
series pumps is 0.25 cP to 300 cP. Please consult
your Flowserve representative for services with
viscosities less than 0.25 cP.

Figure 4-2: Stilt mounted baseplate

3.4.7 Entrained solids

For process fluids with entrained solids the following
restrictions apply to the solids particles:

• 300 micron (0.012 in.) maximum diameter

• Less than 3.0 % solids by weight

• 2 Moh hardness or less (roughly equivalent to

gypsum)

• No ferrous particles

Page 16 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Baseplates intended for grouted installation are
designed to use the grout as a stiffening member.
Stilt mounted baseplates, on the other hand, are
designed to provide their own rigidity. Therefore, the
designs of the two baseplates are usually different.

Regardless of the type of baseplate used, it must
provide certain functions that ensure a reliable
installation. Three of these requirements are:

• The baseplate must provide sufficient rigidity to
assure the assembly can be transported and
installed, given reasonable care in handling,
without damage. It must also be rigid enough
when properly installed to resist operating loads.

• The baseplate must provide a reasonably flat
mounting surface for the pump and driver. Uneven
surfaces will result in a soft-foot condition that may
make alignment difficult or impossible. Flowserve’s
experience indicates that a baseplate that has a top
surface flatness of 1.25 mm/m (0.015 in./ft) across
the diagonal corners of the baseplate provides such
a mounting surface. Therefore, this is the tolerance
to which we supply our standard baseplate. Some
users may desire an even flatter surface, which can
facilitate installation and alignment. Flowserve will
supply flatter baseplates upon request at extra cost.
For example, mounting surface flatness of

0.17 mm/m (0.002 in./ft) is offered on the Flowserve
Type E “Ten Point” baseplate shown in Figure 4-1.

• The baseplate must be designed to allow the
user to final field align the pump and driver to
within their own particular standards and to
compensate for any pump or driver movement
that occurred during handling. Normal industry
practice is to achieve final alignment by moving
the motor to match the pump. Flowserve’s
practice is to confirm in our shop that the pump
assembly can be accurately aligned. Before
shipment, the factory verifies that there is enough
horizontal movement capability at the motor to
obtain a “perfect” final alignment when the
installer puts the baseplate assembly into its
original, top leveled, unstressed condition.

4.3.2 Stilt and spring mounted baseplates

Flowserve offers stilt and spring mounted baseplates.
(See Figure 4-2 for stilt mounted option.) The low
vibration levels of Guardian G & H series pumps
allow the use of these baseplates - provided they are
of a rigid design. The baseplate is set on a flat
surface with no tie down bolts or other means of
anchoring it to the floor.

General instructions for assembling these baseplates
are given below. For dimensional information, please
refer to the appropriate Flowserve “Sales Print.”

4.3.2.1 Stilt mounted baseplate assembly
instructions

Refer to Figure 4-3.
a) Raise or block up baseplate/pump above the floor

to allow for the assembly of the stilts.

b) Predetermine or measure the approximate

desired height for the baseplate above the floor.

c) Set the bottom nuts (item 2) above the stilt bolt

head (item 1) to the desired height.

d) Assemble lock washer (item 3) down over the stilt

bolt.

e) Assemble the stilt bolt up through hole in the

bottom plate and hold in place.

f) Assemble the lock washer (item 3) and nut (item 2)

on the stilt bolt. Tighten the nut down on the lock
washer.

g) After all four stilts have been assembled, position

the baseplate in place, over the floor cups (item

4) under each stilt location, and lower the
baseplate to the floor.

h) Level and make final height adjustments to the

suction and discharge pipe by first loosening the
top nuts and turning the bottom nuts to raise or
lower the baseplate.

i) Tighten the top and bottom nuts at the lock

washer (item 3) first then tighten the other nuts.

j) It should be noted that the connecting pipelines

must be individually supported, and that the stilt
mounted baseplate is not intended to support
total static pipe load.

Figure 4-3: Assembly – baseplate stilt

4.3.2.2 Stilt/spring mounted baseplate assembly
instructions

Refer to Figure 4-4
a) Raise or block up baseplate/pump above the floor

to allow for the assembly of the stilts.

b) Set the bottom nuts (item 4) above the stilt bolt

head (item 1). This allows for 51 mm (2 in.)
upward movement for the final height adjustment
of the suction/discharge flange.

Page 17 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

c) Assemble the lock washer (item 6) flat washer

(item 5) and bottom spring/cup assembly (item 2)
down over the stilt bolt (item 1).

d) Assemble the stilt bolt/bottom spring up through

hole in the bottom plate and hold in place.

e) Assemble top spring/cup assembly (item 3) down

over stilt bolt.

f) Assemble flat washer (item 5), lock washer (item 6)

and nuts (item 4) on the stilt bolt.

g) Tighten down top nuts, compressing the top

spring approximately 12 mm (0.5 in.).

h) After all four stilts have been assembled, position

the baseplate in place, over the floor cups (Item 7)
under each stilt location, and lower the baseplate
down to the floor.

i) Level and make final height adjustments to the

suction and discharge pipe by first loosening the
top nuts, and turning the bottom nuts to raise or
lower the baseplate.

Figure 4-4: Assembly – baseplate stilt/spring

j) To make the stilt bolts more stable, tighten down

on the top nuts, compressing the top spring
approximately 12 mm (0.5 in), and lock the nuts
in place.

k) It should be noted that the connecting pipelines

must be individually supported, and that the
spring mounted baseplate is not intended to
support total static pipe loads.

4.3.2.3 Stilt/spring mounted baseplates - motor
alignment

The procedure for motor alignment on stilt or spring
mounted baseplates is similar to grouted baseplates.
The difference is primarily in the way the baseplate is
leveled.
a) Level the baseplate by using the stilt adjusters.

(Shims are not needed as with grouted
baseplates.) After the base is level, it is locked in
place by locking the stilt adjusters.

b) Next the initial pump alignment must be checked.

The vertical height adjustment provided by the
stilts allows the possibility of slightly twisting the
baseplate. If there has been no transit damage
or twisting of the baseplate during stilt height
adjustment, the pump and driver should be within

0.38 mm (0.015 in.) parallel, and 0.0025 mm/mm
(0.0025 in./in.) angular alignment. If this is not
the case, check to see if the driver mounting
fasteners are centered in the driver feet holes.

c) If the fasteners are not centered there was likely

shipping damage. Re-center the fasteners and
perform a preliminary alignment to the above
tolerances by shimming under the motor for
vertical alignment, and by moving the pump for
horizontal alignment.

d) If the fasteners are centered, then the baseplate

may be twisted. Slightly adjust (one turn of the
adjusting nut) the stilts at the driver end of the
baseplate and check for alignment to the above
tolerances. Repeat as necessary while maintaining
a level condition as measured from the pump
discharge flange. Lock the stilt adjusters.

The remaining steps are as listed for new grouted
baseplates.

4.4 Grouting

a) The pump foundation should be located as close to

the source of the fluid to be pumped as practical.

b) There should be adequate space for workers to

install, operate, and maintain the pump. The
foundation should be sufficient to absorb any
vibration and should provide a rigid support for
the pump and motor.

c) Recommended mass of a concrete foundation

should be three times that of the pump, motor
and base. Refer to figure 4-5.

Foundation bolts are imbedded in the
concrete inside a sleeve to allow some
movement of the bolt.

Figure 4-5: Baseplate anchoring

Page 18 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

d) Level the pump baseplate assembly. If the

baseplate has machined coplanar mounting
surfaces, these machined surfaces are to be
referenced when leveling the baseplate. This may
require that the pump and motor be removed from
the baseplate in order to reference the machined
faces. If the baseplate is without machined
coplanar mounting surfaces, the pump and motor
are to be left on the baseplate. The proper surfaces
to reference when leveling the pump baseplate
assembly are the pump suction and discharge
flanges. DO NOT stress the baseplate.

e) Do not bolt the suction or discharge flanges of the

pump to the piping until the baseplate foundation
is completely installed. If equipped, use leveling
jackscrews to level the baseplate. If jackscrews
are not provided, shims and wedges should be
used. (See Figure 4-5.) Check for levelness in
both the longitudinal and lateral directions. Shims
should be placed at all base anchor bolt locations,
and in the middle edge of the base if the base is
more than 1.5 m (5 ft.) long. Do not rely on the
bottom of the baseplate to be flat. Standard
baseplate bottoms are not machined, and it is not
likely that the field mounting surface is flat.

f) After leveling the baseplate, tighten the anchor

bolts. If shims were used, make sure that the
baseplate was shimmed near each anchor bolt
before tightening. Failure to do this may result in
a twist of the baseplate, which could make it
impossible to obtain final alignment.

g) Check the level of the baseplate to make sure

that tightening the anchor bolts did not disturb the
level of the baseplate. If the anchor bolts did
change the level, adjust the jackscrews or shims
as needed to level the baseplate.

h) Continue adjusting the jackscrews or shims and

tightening the anchor bolts until the baseplate is
level.

i) Check initial alignment. If the pump and motor

were removed from the baseplate proceed with
step j) first, then the pump and motor should be
reinstalled onto the baseplate using Flowserve’s
factory preliminary alignment procedure as
described in section 4.5, and then continue with
the following. As described above, pumps are
given a preliminary alignment at the factory. This
preliminary alignment is done in a way that
ensures that, if the installer duplicates the factory
conditions, there will be sufficient clearance
between the motor hold down bolts and motor foot
holes to move the motor into final alignment. If the
pump and motor were properly reinstalled to the
baseplate or if they were not removed from the
baseplate and there has been no transit damage,
and also if the above steps where done properly,

the pump and driver should be within 0.38 mm
(0.015 in.) FIM (Full Indicator Movement) parallel,
and 0.0025 mm/mm (0.0025 in./in.) FIM angular.
If this is not the case, first check to see if the driver
mounting fasteners are centered in the driver feet
holes. If not, re-center the fasteners and perform
a preliminary alignment to the above tolerances by
shimming under the motor for vertical alignment,
and by moving the pump for horizontal alignment.

j) Grout the baseplate. A non-shrinking grout

should be used. Make sure that the grout fills the
area under the baseplate. After the grout has
cured, check for voids and repair them.
Jackscrews, shims and wedges should be
removed from under the baseplate at this time. If
they were to be left in place, they could rust,
swell, and cause distortion in the baseplate.

k) Run piping to the suction and discharge of the

pump. There should be no piping loads
transmitted to the pump after connection is made.
Recheck the alignment to verify that there are no
significant loads.

4.5 Initial alignment

4.5.1 Horizontal initial alignment procedure

The purpose of factory alignment is to ensure that the
user will have full utilization of the clearance in the
motor holes for final job-site alignment. To achieve
this, the factory alignment procedure specifies that
the pump be aligned in the horizontal plane to the
motor, with the motor foot bolts centered in the motor
holes. This procedure ensures that there is sufficient
clearance in the motor holes for the customer to field
align the motor to the pump, to zero tolerance. This
philosophy requires that the customer be able to
place the base in the same condition as the factory.
Thus the factory alignment will be done with the base
sitting in an unrestrained condition on a flat and level
surface. This standard also emphasizes the need to
ensure the shaft spacing is adequate to accept the
specified coupling spacer.

The factory alignment procedure is summarized below:
a) The baseplate is placed on a flat and level

workbench in a free and unstressed position.

b) The baseplate is leveled as necessary. Leveling

is accomplished by placing shims under the rails
of the base at the appropriate anchor bolt hole
locations. Levelness is checked in both the
longitudinal and lateral directions.

c) The motor and appropriate motor mounting

hardware is placed on the baseplate and the
motor is checked for any planar soft-foot
condition. If any is present it is eliminated by
shimming

Page 19 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

d) The motor feet holes are centered on the motor

mounting fasteners. This is done by using a
centering nut as shown in Figure 4-6.

Figure 4-6: Motor centering fastener

e) The motor is fastened in place by tightening the

nuts on two diagonal motor mounting studs.

f) The pump is put onto the baseplate and leveled.

The foot piece under the bearing housing is
adjustable. It is used to level the pump, if
necessary. If an adjustment is necessary, add
or remove shims [3126.1] between the foot piece

and the bearing housing.
g) The spacer coupling gap is verified.
h) The parallel and angular vertical alignment is

made by shimming under the motor.
i) The motor feet holes are again centered on the

motor mounting studs using the centering nut.

At this point the centering nut is removed and

replaced with a standard nut. This gives

maximum potential mobility for the motor to be

horizontally moved during final, field alignment.

All four motor feet are tightened down.
j) The pump and motor shafts are then aligned

horizontally, both parallel and angular, by

moving the pump to the fixed motor. The pump

feet are tightened down.
k) Both horizontal and vertical alignment is again

final checked as is the coupling spacer gap.
See section 4.8 for Final Shaft Alignment

4.6 Piping

The protective covers are fitted to both
the suction and discharge flanges of the casing and must
be removed prior to connecting the pump to any pipes.

4.6.1 4.6.1 Suction and discharge piping

All piping must be independently supported,
accurately aligned and preferably connected to the
pump by a short length of flexible piping. The pump
should not have to support the weight of the pipe or
compensate for misalignment. It should be possible
to install suction and discharge bolts through mating
flanges without pulling or prying either of the flanges.

All piping must be tight. Pumps may air-bind if air is
allowed to leak into the piping. If the pump flange(s)
have tapped holes, select flange fasteners with
thread engagement at least equal to the fastener
diameter but that do not bottom out in the tapped
holes before the joint is tight.

4.6.2 Suction piping

To avoid NPSH and suction problems, suction piping
must be at least as large as the pump suction
connection. Never use pipe or fittings on the suction
that are smaller in diameter than the pump suction size.

Figure 4-7 illustrates the ideal piping configuration with a
minimum of 10 pipe diameters between the source and
the pump suction. In most cases, horizontal reducers
should be eccentric and mounted with the flat side up as
shown in Figure 4-8 with a maximum of one pipe size
reduction. Never mount eccentric reducers with the flat
side down. Horizontally mounted concentric reducers
should not be used if there is any possibility of entrained
air in the process fluid. Vertically mounted concentric
reducers are acceptable. In applications where the fluid
is completely deaerated and free of any vapor or
suspended solids, concentric reducers are preferable to
eccentric reducers

Figures 4-7 and Figure 4-8

Avoid the use of throttling valves and strainers in the
suction line. Start up strainers must be removed shortly
before start up. When the pump is installed below the
source of supply, a valve should be installed in the
suction line to isolate the pump and permit pump
inspection and maintenance. However, never place a
valve directly on the suction nozzle of the pump.

Refer to the Durco Pump Engineering Manual and
the Centrifugal Pump IOM Section of the Hydraulic
Institute Standards for additional recommendations
on suction piping. (See section 10.)

Page 20 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Refer to section 3.4 for performance and operating
limits.

4.6.2.1 Guardian self-priming pumps

The suction piping must be as short as possible and be
as close to the diameter of the suction nozzle as is
practical. The pump works by removing the air
contained in the suction piping. Once removed, it
operates exactly the same as a flooded suction
standard pump. Longer and larger suction pipes have a
greater volume of air that has to be removed, resulting
in longer priming time. The suction piping and seal
chamber must be airtight to allow priming to occur.
When possible, it is recommended that suction piping
be sloped slightly towards the casing to ensure no fluid
is lost down the suction line during priming.

4.6.3 Discharge piping

Install a valve in the discharge line. This valve is
required for regulating flow and/or to isolate the pump
for inspection and maintenance.

When fluid velocity in the pipe is high,
for example, 3 m/s (10 ft/s) or higher, a rapidly
closing discharge valve can cause a damaging
pressure surge. A dampening arrangement should
be provided in the piping.

4.6.3.1 Guardian self-priming pumps

During the priming cycle, air from the suction piping is
evacuated into the discharge piping. There must be
a way for this air to vent. If air is not able to freely
vent out the discharge pipe, it is typically
recommended to install an air bleed line. The air
bleed line is typically connected from the discharge
pipe to the sump. Care must be taken to prevent air
from re-entering suction pipe.

4.6.4 Allowable nozzle loads

Flowserve chemical process pumps meet or exceed
the allowable nozzle loads given by ANSI/HI 9.6.2.
The following paragraphs describe how to calculate
the allowable loads for each pump type and how to
determine if the applied loads are acceptable. The
configuration covered is for ASME B73.3 pumps,
including the Guardian G & H series.

4.6.4.1 Guardian G & H series pumps (ASME

B73.3)

The following steps are based upon ANSI/HI 9.6.2.
All information necessary to complete the evaluation
is given below. For complete details please review
the standard.
a) Determine the appropriate casing “Material Group

No.” from figure 3-8.

b) Find the “Casing material correction factor” in

Figure 4-9 based upon the “Material Group No.”
and operating temperature. Interpolation may be
used to determine the correction factor for a
specific temperature.

c) Find the “Baseplate correction factor” in Figure

4-10. The correction factor depends upon how
the baseplate is to be installed.

d) Locate the pump model being evaluated in Figure

4-14 and multiply each load rating by the casing
correction factor. Record the “adjusted Figure 4-14
loads”.

e) Locate the pump model being evaluated in

Figures 4-15 and 4-16 and multiply each load
rating by the baseplate correction factor. Record
the adjusted Figure 4-15 and 4-16 loads.

f) Compare the “adjusted Figure 4-14 loads” to the

values shown in figure 4-13. The lower of these
two values should be used as the adjusted figure
4-13 values. (The HI standard also asks that figure

4-13 loads be reduced if figure 4-15 or 4-16 values
are lower. Flowserve does not follow this step.)

g) Calculate the applied loads at the casing flanges

according to the coordinate system found in
figure 4-11. The 12 forces and moments possible
are Fxs, Fys, Fzs, Mxs, Mys, Mzs, Fxd, Fyd, Fzd,
Mxd, Myd and Mzd. For example, Fxd
designates Force in the “x” direction on the
discharge flange. Mys designates the Moment
about the “y”-axis on the suction flange.

h) Figure 4-12 gives the acceptance criteria

equations. For long coupled pumps, equation
sets 1 through 5 must be satisfied. For close
coupled pumps, only equation sets 1 and 2 must
be satisfied.

i) Equation set 1. Each applied load is divided by

the corresponding adjusted figure 4-13 value.
The absolute value of each ratio must be less
than or equal to one.

j) Equation set 2. The summation of the absolute

values of each ratio must be less than or equal to
two. The ratios are the applied load divided by
the adjusted figure 4-14 values.

k) Equation sets 3 and 4. These equations are

checking for coupling misalignment due to nozzle
loading in each axis. Each applied load is divided
by the corresponding adjusted load from figure 4-15
and 4-16. The result of each equation must be
between one and negative one.

l) Equation set 5. This equation calculates the total

shaft movement from the results of equations 3
and 4. The result must be less than or equal to
one.

Page 21 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 4-9: Casing material correction factors

Material Group No.

1.0 1.1 2.1 2.2 2.4 2.8 3.2 3.4 3.5 3.7 3.8 3.17 Ti Cr

Tem

Tem

p ˚C

p ˚F

-129 -200 - - 1.00 1.00 1.00 - 0.50 - - - - 0.83 - -

-73 -100 - - 1.00 1.00 1.00 1.00 0.50 0.83 0.93 1.00 1.00 0.83 0.89 -

-29 -20 0.89 1.00 1.00 1.00 1.00 1.00 0.50 0.83 0.93 1.00 1.00 0.83 0.89 0.65
38 100 0.89 1.00 1.00 1.00 1.00 1.00 0.50 0.83 0.93 1.00 1.00 0.83 0.89 0.65
93 200 0.83 0.94 0.83 0.86 0.93 1.00 0.50 0.74 0.88 1.00 1.00 0.72 0.86 0.65

150 300 0.78 0.91 0.75 0.78 0.83 0.92 0.50 0.69 0.82 1.01 1.01 0.65 0.81 0.65
205 400 0.73 0.88 0.69 0.72 0.69 0.85 0.50 0.67 0.77 0.98 0.98 0.58 0.69 0.65
260 500 0.69 0.83 0.63 0.67 0.64 0.80 0.50 0.66 0.74 0.92 0.92 0.54 0.57 ­315 600 0.65 0.76 0.60 0.63 0.60 0.77 0.50 0.66 0.74 0.84 0.84 0.50 0.45 -

Note: see specific temperature limitations of Guardian pumps in Sections 3-6 and 3-7.

DCI

Carbon

Steel

Austenitic steels Nickel and nickel alloys

Type

Type

304

316

and

304L

Type

and

316L

321

CD-

4MCu

Nickel Monel Inconel

Hast B Hast C Alloy

20

Ti,
Ti-

Pd,

Zr

Chrome

171 ˚C

340 ˚F)

Figure 4-10: Baseplate correction factors

Base type Grouted Bolted

Type A 1.0 0.7 0.65
Type B - Polybase 1.0 NA 0.95
Type C N/A 1.0 1.0
Type D 1.0 0.8 0.75
Type E - PIP 1.0 0.95 N/A
Polyshield - baseplate

/foundation

1.0 N/A N/A

Stilt

mounted

High

-18 to
(0 to

Page 22 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

≤≤−

Figure 4-11: Coordinate system

Figure 4-12: Acceptance criteria equations

Set Equations Figure Remarks

F

xs

F

1

2

adjxs

F

xd

F

adjxd

F

xs

F

adjxs

F

xd

F

adjxd

F

ys

F

adjys

F

yd

F

adjyd

F

ys

F

F

F

F

adjys

yd

F

adjyd

F

zs

F

adjzs

F

zd

F

adjzd

F

zs

adjzs

F

zd

M

xs

M

adjxs

M

xd

M

adjzd

M

xs

M

adjxs

M

xd

M

adjxd

M

ys

M

adjys

M

yd

M

adjxd

adjyd

M

ys

M

adjys

M

yd

M

adjyd

M

zs

M

M

++++++

______

adjzs

M

zd

≤+++++

______

adjzd

M

zs

M

______

adjzs

M

zd

M

______

0.2

,0.1,0.1,0.1,0.1,0.1,0.1

≤≤≤≤≤≤

Adjusted

4-15

0.1,0.1,0.1,0.1,0.1,0.1

≤≤≤≤≤≤

adjzd

Adjusted

4-16

Maximum
individual

loading

Nozzle

stress, bolt

stress, pump

slippage

M

M

ys

M

adjys

M

yd

+++

adjyd

M

xs

M

adjxs

F

zd

M

adjzd

M

M

M

xd

M

adjxd

M

M

M

zs

++++=

adjzs

____

zd

adjzd

____

M

M

M

yd

adjyd

M

zs

+++++=

adjzs

_____

M

zd

+++++

M

adjzd

______

ys

adjys

F

A

3

F

B

4

F

5

Note: All of the above equations are found by dividing the applied piping loads by the

ys

F

adjys

F

yd

adjyd

F

xs

F

adjxs

F

xd

adjxd

B

0.10.1

0.10.1 ≤≤− A

M

F

0.122≤+BA

M

xs

M

adjxs

M

xd

adjxd

F

zs

F

adjzs

F

yd

F

adjyd

adjusted

figure values

Adjusted

4-17

Adjusted

4-18

.

y-axis

movement

z-axis

movement

-

Combined

axis

movement

Page 23 of 68 flowserve.com

Figure 4-13: Maximum individual loading

Suction flange Discharge flange

Pump size

1K 1.5x1-6

Forces N (lbf) Moments Nm (lbf•ft) Forces N (lbf) Moments Nm (lbf•ft)

Fxs Fys Fzs Mxs Mys Mzs Fxd Fyd Fzd Mxd Myd Mzd

4 670

(1 050)

3 330

(750)

3 330

(750)

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

970

(720)

230

(170)

230

(170)

3 560

(800)

6 000

(1 350)

13 340
(3 000)

550

(410)

550

(410)

550

(410)

1K 3x1.5-6

1K 3x2-6

1K 1.5x1-8 &
1K 1.5x1.5US-8

1K 3x1.5-8

2K 3x2-8

2K 4x3-8

2K 2x1-10A &
2K 2x1.5US-10A

2K 3x1.5-10A

2K 3x2-10A &
2K 3x2US-10

2K 4x3-10, 10H &
2K 4x3US-10H

2K 6x4-10 and 10H

4 670

(1 050)

4 670

(1 050)

4 670

(1 050)

4 670

(1 050)
12 000

(2 700)
12 000

(2 700)
10 400

(2 340)
12 000

(2 700)
12 000

(2 700)
10 230

(2 300)
12 000

(2 700)

5 510

(1 240)

4 670

(1 050)

5 380

(1 210)

5 510

(1 240)

6 000

(1 350)

6 000

(1 350)

4 270

(960)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

5 560

(1 250)

4 670

(1 050)

5 380

(1 210)

5 560

(1 250)

6 670

(1 500)

6 670

(1 500)

4 270

(960)

6 670

(1 500)

6 580

(1 480)

6 670

(1 500)

6 670

(1 500)

1 220

(900)

1 220

(900)

970

(720)

1 220

(900)

1 760

(1 300)

1 760

(1 300)

1 720

(1 270)

1 760

(1 300)

1 760

(1 300)

1 760

(1 300)

1 760

(1 300)

660

(490)

300

(220)

260

(190)

660

(490)

810

(600)

470

(350)

300

(220)

570

(420)

420

(310)

420

(310)
1 490

(1 100)

660

(490)

300

(220)

260

(190)

660

(490)

810

(600)

470

(350)

300

(220)

570

(420)

420

(310)

420

(310)
1 490

(1 100)

3 560

(800)

3 560

(800)

3 560

(800)

3 560

(800)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

13 340
(3 000)

13 340
(3 000)

13 340
(3 000)

13 340
(3 000)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

680

(500)

680

(500)

490

(360)

600

(440)

890

(660)
1 630

(1 200)

890

(660)

500

(370)

760

(560)
1 630

(1 200)

1 630

(1 200)

740

(550)
1 350

(1 000)

490

(360)

600

(440)

890

(660)
1 980

(1 460)

890

(660)

500

(370)

760

(560)
1 980

(1 460)

2 030

(1 500)

690

(510)

690

(510)

490

(360)

600

(440)

890

(660)

930

(690)

890

(660)

500

(370)

760

(560)

930

(690)

930

(690)

2K 3x1.5-13

2K 3x2-13 &
2K 3x2US-13

2K 4x3-13, 13HH &
2K 4x3US-13

2K 6x4-13A

12 000
(2 700)

8 540

(1 920)
12 000

(2 700)
12 000

(2 700)

6 000

(1 350)

5 470

(1 230)

6 000

(1 350)

6 000

(1 350)

6 670

(1 500)

5 470

(1 230)

6 670

(1 500)

6 670

(1 500)

1 760

(1 300)

1 760

(1 300)

1 760

(1 300)

1 760

(1 300)

910

(670)

470

(350)

540

(400)
1 760

(1 300)

910

(670)

470

(350)

540

(400)
1 490

(1 100)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 220

(1 400)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

14 450
(3 250)

720

(530)
1 630

(1 200)

1 630

(1 200)

1 630

(1 200)

720

(530)
1 720

(1 270)

2 030

(1 500)

2 030

(1 500)

720

(530)

930

(690)

930

(690)

930

(690)

Page 24 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 4-14: Maximum combined loading

Suction flange Discharge flange

Pump size

1K 1.5x1-6

1K 3x1.5-6

1K 3x2-6
1K 1.5x1-8 &

1K 1.5x1.5US-8
1K 3x1.5-8

2K 3x2-8

2K 4x3-8
2K 2x1-10A &

2K 2x1.5US-10A
2K 3x1.5-10A
2K 3x2-10A &

2K 3x2US-10
2K 4x3-10, 10H &

2K 4x3US-10H
2K 6x4-10 and 10H

2K 3x1.5-13
2K 3x2-13 &

2K 3x2US-13
2K 4x3-13, 13HH &

2K 4x3US-13
2K 6x4-13A

Forces N (lbf) Moments Nm (lbf•ft) Forces N (lbf) Moments Nm (lbf•ft)

Fxs Fys Fzs Mxs Mys Mzs Fxd Fyd Fzd Mxd Myd Mzd

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)
12 000

(2 700)
12 000

(2 700)
10 400

(2 340)
12 000

(2 700)
12 000

(2 700)
10 230

(2 300)
12 000

(2 700)
12 000

(2 700)

8 540

(1 920)
12 000

(2 700)
12 000

(2 700)

3 330

(750)

5 510

(1 240)

4 670

(1 050)

5 380

(1 210)

5 510

(1 240)

6 000

(1 350)

6 000

(1 350)

4 270

(960)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

6 000

(1 350)

5 470

(1 230)

6 000

(1 350)

6 000

(1 350)

3 330

(750)

9 380

(2 110)

4 670

(1 050)

5 380

(1 210)

7 290

(1 640)

11 070

(2 490)

8 180

(1 840)

4 270

(960)

8 500

(1 910)

6 580

(1 480)

7 290

(1 640)

27 700

(6 240)

13 600

(3 060)

5 470

(1 230)

10 630

(2 390)

27 700

(6 240)

2 480

(1 830)

3 100

(2 290)

3 100

(2 290)

2 480

(1 830)

3 100

(2 290)

5 060

(3 730)

5 060

(3 730)

4 930

(3 640)

5 060

(3 730)

5 060

(3 730)

5 060

(3 730)

5 060

(3 730)

5 060

(3 730)

5 060

(3 730)

5 060

(3 730)

5 060

(3 730)

230

(170)

660

(490)

300

(220)

260

(190)

660

(490)

810

(600)

470

(350)

300

(220)

570

(420)

420

(310)

420

(310)
1 490

(1 100)

910

(670)

470

(350)

540

(400)
6 750

(4 980)

230

(170)

660

(490)

300

(220)

260

(190)

660

(490)

810

(600)

470

(350)

300

(220)

570

(420)

420

(310)

420

(310)
1 490

(1 100)

910

(670)

470

(350)

540

(400)
1 490

(1 100)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 760

(1 970)

8 980

(2 020)

8 980

(2 020)

8 630

(1 940)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

8 980

(2 020)

Figure 4-15: Maximum Y-axis loading for shaft deflection

Suction flange Discharge flange

Pump size

Group 1

Group 2

Forces N (lbf) Moments Nm (lbf•ft) Forces N (lbf) Moments Nm (lbf•ft)

Fxs Fys Fzs Mxs Mys Mzs Fxd Fyd Fzd Mxd Myd Mzd

-

-

-8 860

(-2 000)

-15 570
(-3 500)

1 220

­(900)

1 760

-

(1 300)

1 630

(1 200)

1 760

(1 300)

1 690

(1 250)

4 070

(3 000)

-

-

4.6.4.2 Figure 4-16: Maximum Z-axis loading for shaft deflection

Suction flange Discharge flange

Pump size

Group 1

Group 2

Forces N (lbf) Moments Nm (lbf•ft) Forces N (lbf) Moments Nm (lbf•ft)

Fxs Fys Fzs Mxs Mys Mzs Fxd Fyd Fzd Mxd Myd Mzd

4 670

(1 050)
15 570

(3 500)

-

-

-5 560

(-1 250)

-6 670

(-1 500)

2 030

(1 500)

2 030

(1 500)

1 630

(1 200)

1 760

(1 300)

-3 390

(-2 500)

-4 740

(-3 500)

3 560

(800)

6 220

(1 400)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

(1 350)

6 670

(1 500)

11 120

(2 500)

8 860

(2 000)
11 120

(2 500)

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

6 000

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

27 700
(6 240)

-

-

-13 340
(-3 000)

-14 450
(-3 250)

(1 030)

(1 460)

(1 460)

(3 100)

(1 460)

(1 730)

(2 150)

-680

(-500)

-1 630

(-1 200)

-2 030

(-1 500)

-2 030

(-1 500)

550

(410)

740

(550)
1 400

490

(360)

600

(440)

890

(660)
1 980

890

(660)

500

(370)

760

(560)
1 980

4 200

720

(530)
1 980

2 340

2 910

(410)

(550)

1 400

(1 030)

(360)

(440)

(660)

1 980

(1 460)

(660)

(370)

(560)

1 980

(1 460)

4 200

(3 100)

(530)

1 980

(1 460)

2 340

(1 730)

2 910

(2 150)

2 030

(1 500)

2 030

(1 500)

1 350

(1 000)

2 910

(2 150)

550

740

490

600

890

890

500

760

720

550

(410)

690

(510)

690

(510)

490

(360)

600

(440)

890

(660)

930

(690)

890

(660)

500

(370)

760

(560)

930

(690)

930

(690)

720

(530)

930

(690)

930

(690)

930

(690)

1 690

(1 250)

4 070

(3 000)

-3 390

(-2 500)

-4 740

(-3 500)

Page 25 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

4.6.5 Auxiliary equipment

4.6.5.1 External flush option E01

Flush option E01 is the use of a recirculation from
discharge or an external process compatible source
through the driven section and a return to process.

Referring to Figure 4-17, determine the inlet location
for the flush fluid. It should be in either location “1JI”
or “1HI” (1JI is standard). Hook up external flush
lines and make sure the required inlet pressure
ensures that liquid is flowing into the pump (1.0 to 1.4
bar [15 to 20 psi] margin over containment shell
pressure). The external flush should start running
either before the pump is rotating or when the pump
starts to rotate.

If flush option E01 is specified, failure
to provide external flush before starting the
motor/pump could result in bearing damage.

Always install a check valve in the inlet
flush line as close to the pump as possible to avoid
reverse flow in the flush line.

Figure 4-17: External flush inlet locations

Figure 4-18: External flush option code E01

Figure 4-19: External flush – cutaway view

4.6.5.2 Piping connection - bearing housing
cooling system

Make connections as shown below. Liquid at less
than 32 °C (90 °F) should be supplied at a regulate d
flow rate of at least 0.06 l/s (1 gpm).

Figure 4-20: Oil cooler - Group 1 schematic

Page 26 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 4-21: Oil cooler - Group 2 schematic

4.6.5.3 Piping connection - support leg cooling
for centerline mounting option

If the casing is centerline mounted, and the process
temperature is over 178 °C (350 °F), then the casin g
support legs may need to be cooled. Cool water - less
than 32 °C (90 °F) - should be run through the legs at a
flow rate of at least 0.06 l/s (1 gpm) as shown below.

Figure 4-22 Centerline mounting option

4.6.5.5 Piping connection - oil mist lubrication
system

The piping connections for an oil mist lubrication
system are shown below in Figures 4-24 and 4-25.

Figure 4-24: Oil mist connections – labyrinth style
oil seals (standard)

Figure 4-25: Oil mist connections – lip seals
(optional)

4.6.5.4 Piping connection - Heating/cooling fluid
for jacketed/casing

The piping connections for jacketed casings are shown
below. The flow rate of the cooling water - less than
32 °C (90 °F) - should be at least 0.13 l/s (2 gpm) .

Figure 4-23: Jacketed casing connections

Notes:

1. When circulating steam, use top hole for inlet. Both bottom

holes must be plumbed together for outlet, to ensure draining
both sides of jacket.

2. When circulating liquid use both bottom holes as inlets. Use top

hole as outlet.

4.7 Electrical connections

Electrical connections must be made by
a qualified Electrician in accordance with relevant
local national and international regulations.

It is important to be aware of the EUROPEAN
DIRECTIVE on potentially explosive areas where
compliance with IEC60079-14 is an additional
requirement for making electrical connections.

It is important to be aware of the EUROPEAN
DIRECTIVE on electromagnetic compatibility when
wiring up and installing equipment on site. Attention
must be paid to ensure that the techniques used
during wiring/installation do not increase
electromagnetic emissions or decrease the
electromagnetic immunity of the equipment, wiring or
any connected devices. If in any doubt contact
Flowserve for advice.

Page 27 of 68 flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

The motor must be wired up in
accordance with the motor manufacturer's
instructions (normally supplied within the terminal
box) including any temperature, earth leakage,
current and other protective devices as appropriate.
The identification nameplate should be checked to
ensure the power supply is appropriate.

See section 5.4,

before connecting the motor to the electrical supply.

For close coupled pumps it is necessary
to wire the motor with flexible conduit of sufficient length
to allow the motor/power end assembly to be moved
back from the casing for maintenance.

Direction of rotation

4.8 Final shaft alignment check

a) Level baseplate if appropriate.
b) Mount and level pump if appropriate. Level the

pump by putting a level on the discharge flange.
If not level, adjust the footpiece by adding or
deleting shims [3126.1] between the footpiece
and the bearing housing.

c) Check initial alignment. If pump and driver have

been remounted or the specifications given below
are not met, perform an initial alignment as
described in Section 4.5. This ensures there will
be sufficient clearance between the motor hold
down bolts and motor foot holes to move the
motor into final alignment. The pump and driver
should be within 0.38 mm (0.015 in.) FIM (Full
Indicator Movement) parallel, and 0.0025 mm/mm
(0.0025 in./in.) FIM angular.
Stilt mounted baseplates: If initial alignment
cannot be achieved with the motor fasteners
centered, the baseplate may be twisted. Slightly
adjust (one turn of the adjusting nut) the stilts at
the driver end of the baseplate and check for
alignment to the above tolerances. Repeat as
necessary while maintaining a level condition as
measured from the pump discharge flange.

d) Run piping to the suction and discharge to the

pump. There should be no piping loads
transmitted to the pump after connection is
made. Recheck the alignment to verify that
there are no significant changes.

e) Perform final alignment. Check for soft-foot under

the driver. An indicator placed on the coupling,
reading in the vertical direction, should not indicate
more than 0.05 mm (0.002 in.) movement when
any driver fastener is loosened. Align the driver
first in the vertical direction by shimming
underneath its feet. When satisfactory alignment is
obtained the number of shims in the pack should
be minimized. It is recommended that no more

than five shims be used under any foot. Final
horizontal alignment is made by moving the driver.
Maximum pump reliability is obtained by having
near perfect alignment. Flowserve recommends
no more than 0.05 mm (0.002 in.) parallel, and

0.0005 mm/mm (0.0005 in./in.) angular
misalignment. (See Section 6.8.4.2.)

f) Operate the pump for at least an hour or until it

reaches final operating temperature. Shut the
pump down and recheck alignment while the pump
is hot. Piping thermal expansion may change the
alignment. Realign pump as necessary.

4.9 Protection systems

The following protection systems are
recommended particularly if the pump is installed in a
potentially explosive area or is handling a hazardous
liquid. If in doubt consult Flowserve.

If there is any possibility of the system allowing the
pump to run against a closed valve or below
minimum continuous safe flow a protection device
should be installed to ensure the temperature of the
liquid does not rise to an unsafe level.

If there are any circumstances in which the system
can allow the pump to run dry, or start up empty, a
power monitor should be fitted to stop the pump or
prevent it from being started. This is particularly
relevant if the pump is handling a flammable liquid.

If leakage of product from the pump can cause a
hazard it is recommended that an appropriate
leakage detection system is installed.

To prevent excessive surface temperatures at
bearings it is recommended that temperature or
vibration monitoring are carried out.

Auxiliary equipment – instrumentation

4.9.1 Leak detection

An intrinsically-safe, optical leak detection system is
available for Guardian G & H series pumps. Contact
your local Flowserve Sales office or Distributor/
Representative for more details.

4.9.2 Temperature probes

Optional temperature probes are available to monitor
both the external shell surface and the internal fluid in
the containment shell (Figure 4-26). Refer to Figure 4­27 to determine the instrument location for probe type.

Wiring diagrams: refer to Figure 4-26 for both Type J
and RTD designs.

Page 28 of 68

flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 4-26: Temperature probe wiring diagram – Guardian G & H Series

Figure 4-27: Pump tap identification

Page 29 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

5 COMMISSIONING, STARTUP,

OPERATION AND SHUTDOWN

5.1 Pre-commission procedure

Pre start-up checks

Prior to starting the pump it is essential that the
following checks be made. These checks are all
described in detail in the Maintenance Section of this
manual.

•

Pump and motor properly secured to the baseplate

•

All fasteners tightened to the correct torque, see

section 6.5

•

Coupling guard in place and not rubbing

•

Rotation check, see section 5.4.

This is absolutely essential

•

Impeller clearance setting, see section 6.6

•

Bearing lubrication, see section 5.2

•

Bearing housing cooling system operational

•

Support leg cooling for centerline mounting

option operational

•

Heating/cooling for jacketed casing operational

•

Pump instrumentation is operational

•

Pump is primed

•

Rotation of shaft by hand

•

Remove temporary motor supports installed for

shipping (close-coupled pumps only)

As a final step in preparation for operation, it is
important to rotate the shaft by hand to be certain
that all rotating parts move freely, and that there are
no foreign objects in the pump casing.

5.2 Pump lubricants

5.2.1 Oil bath

The standard bearing housing bearings are oil bath
lubricated and are not lubricated by Flowserve.
Before operating the pump, fill the bearing housing to
the center of the oil sight glass with the proper type
oil. (See Figure 5-1 for approximate amount of oil
required - do not overfill.)

The oil level in the bearing housing must be
maintained at ±3 mm (±1/8 in.) from the center of the
sight glass. The sight glass has a 6 mm (¼ in.) hole
in the center of its reflector. The bearing housing oil
level must be within the circumference of the center
hole to ensure adequate lubrication of the bearings.

See Figure 5-2 for recommended lubricants. DO NOT
USE DETERGENT OILS. The oil must be free of
water, sediment, resin, soaps, acid and fillers of any
kind. It should contain rust and oxidation inhibitors. The
proper oil viscosity is determined by the bearing housing
operating temperature as given in Figure 5-3.
To add oil to the housing, clean and then remove the
vent plug [6521] at the top of the bearing housing, pour
in oil until it is visually half way up in the sight glass
[3856]. Fill the constant level oiler bottle, if used, and
return it to its position. The correct oil level is obtained
with the constant level oiler in its lowest position, which
results in the oil level being at the top of the oil inlet
pipe nipple, or half way up in the sight glass window.
Oil must be visible in the bottle at all times.

Note that on ANSI 3A™ power ends there is no
constant level oiler. As stated above, proper oil level
is the center of the “bull’s eye” sight glass [3856].

In many pumping applications lubricating oil becomes
contaminated before it loses its lubricating qualities or
breaks down. For this reason it is recommended that
the first oil change take place after approximately 160
hours of operation, at which time, the used oil should be
examined carefully for contaminants. During the initial
operating period monitor the bearing housing operating
temperature. Record the external bearing housing
temperature. See Figure 5-4 for maximum acceptable
temperatures. The normal oil change interval is based
on temperature and is shown in Figure 5-5.

Figure 5-1: Amount of oil required

Pump Guardian G & H Series pumps

Group 1 240 ml (8.1 oz)
Group 2 545 ml (18.4 oz)

Page 30 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 5-2: Recommended oil lubricants

Oil Splash / force feed / purge oil mist/ pure oil mist lubrication

Viscosity cSt

@ 40 ºC

Oil temperature range *

lubrication

Centrifugal pump

Oil companies and

* Note that it normally takes 2 hours for bearing temperature to stabilize and the final temperature will depend on the ambient, r/min, pumpage
temperature and pump size. Also some oils have a very low pour point and good viscosity index which extend the minimum temperature
capability of the oil. Always check the grade capability where the ambient is less than -5 ºC (23 ºF).

†

Use LSC for oil mist. Oil parameters provide flash point >166 ºC (331 ºF), density >0.87 @ 15 ºC (59 ºF), pour point of -10 ºC (14 ºF) or lower.

**

Normal compounded oils CANNOT be used with oil mist as anti-foam additives need to be avoided. Most oils recommended for wet
splash lubrication contain foam inhibitors as well as antioxidants and anticorrosion additives, so they are unsuitable for oil mist. Some
synthetic lubricants may attack the Nitrile seals used in a regular bearing housing.

Designation to ISO 3448

and DIN51524 part 2

BP Castrol †

ESSO †

ELF/Total †

LSC (for oil mist)**

ExxonMobil †

lubricants

Wintershall (BASF Group) †

Q8 †

Shell †

Chevron Texaco †

Fuchs †

Energol HLP-HM 32

LSO 32 (Synthetic oil)

32

-5 to 65 ºC

(23 to 149 ºF)

ISO VG 32

32 HLP

Energol HLP-HM 46

NUTO HP 32

ELFOLNA DS 32

Azolla ZS 32

LSO 46 (Synthetic oil)

Mobil DTE 24

Q8 Haydn 32

Shell Tellus 32

Rando HD 32

Wiolan HS32

Renolin CL 32

46

-5 to 78 ºC

(23 to 172 ºF)

ISO VG 46

46 HLP

NUTO HP 46

ELFOLNA DS 46

Azolla ZS 46

Mobil DTE 25

Q8 Haydn 46

Shell Tellus 46

Rando HD 46
Wiolan HS46

Renolin CL 46

68

-5 to 80 ºC

(23 to 176 ºF)

ISO VG 68

68 HLP

Energol HLP-HM 68

NUTO HP 68

ELFOLNA DS 68

Azolla ZS 68

LSO 68 (Synthetic oil)

Mobil DTE 26

Q8 Haydn 68

Shell Tellus 68

Rando HD 68

Wiolan HS68

Renolin CL 68

Figure 5-3: Oil viscosity grades

Maximum oil
temperature

Up to 71 °C (160 °F) 46 95
71-80 °C (160-175 °F) 68 95
80-94 °C (175-200 °F) 100 95

ISO viscosity
grade

Minimum
viscosity index

Figure 5-4: Maximum external housing
temperatures

Lubrication Temperature

Oil bath 82 °C (180 °F)
Oil mist 82 °C (180 °F)
Grease 94 °C (200 °F)

5.2.2 Grease for life double shielded or double
sealed bearings

These bearings are packed with grease by the
bearing manufacturer and should not be relubricated.
The replacement interval for these bearings is greatly
affected by their operating temperature and speed.
Shielded bearings typically operate cooler.

5.2.3 Oil mist

When optional oil mist lubricated bearings are
specified, the bearing housing is furnished with a
plugged 1/2 in. NPT top inlet for connection to the
user’s oil mist supply system, a vent fitting in the
bearing cover, and a plugged 1/4 in. NPT bottom

The maximum temperature that the

bearing can be exposed to is 105 °C (220 °F).

Figure 5-5: Lubrication intervals *

Lubricant

Mineral oil 6 months 3 months 1.5 months

Synthetic oil ** 18 months 18 months 18 months

* Assuming good maintenance and operation practices, and no

contamination.

** May be increased to 36 months with ANSI 3A™ power end.

Under 71 °C

(160 °F)

71-80 °C

(160-175 °F)

80-94 °C

(175-200 °F)

drain. See

Oil Mist Lubrication System

in Section

4.6.5.5.

Do not allow oil level to remain above the center of
the bearing housing sight glass window with purge
mist (wet sump) systems.

5.3 Impeller clearance

For Guardian G & H series pumps the impeller
clearance is set to the bearing holder at 0.45 mm
(0.018 in.) regardless of operating temperature.
Clearance is set by adding or removing shims located
between the impeller and thrust collar. See Section

6.6 for instructions on how to set the impeller.

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5.4 Direction of rotation

5.4.1 Rotation check, long-coupled pumps

It is absolutely essential that the
rotation of the motor be checked before connecting
the shaft coupling. Incorrect rotation of the pump, for
even a short time, can dislodge and damage the
impeller, casing, shaft and shaft seal. All Guardian G
& H series pumps turn clockwise as viewed from the
motor end. A direction arrow is cast on the front of
the casing as shown in Figure 5-6. Make sure the
motor rotates in the same direction.

Figure 5-6: Direction of rotation arrow

5.4.2 Rotation check, close-coupled pumps

This check will require operating the pump briefly, so
the pump must be filled with liquid. Never run a
centrifugal pump dry. To check rotation, perform the
following steps:
a) Open the suction and discharge valves to allow

the pump to fill with liquid.

b) While watching the motor fan, bump the motor.

The proper direction of rotation for the pump is
clockwise as viewed from the motor end. A
direction arrow cast on the front of the casing as
shown in Figure 5-6.

5.4.3 Coupling installation

The coupling (Figure 5-7) should be
installed as advised by the coupling manufacturer.
Pumps are shipped without the spacer installed. If
the spacer has been installed to facilitate alignment,
then it must be removed prior to checking rotation.
Remove all protective material from the coupling and
shaft before installing the coupling.

Figure 5-7: Coupling

5.5 Guarding

Power must never be applied to the
driver when the coupling guard is not installed.

5.5.1 Clam shell guard - standard

The standard coupling guard for all Guardian G & H
series pumps is the “clam shell” design and is shown
in Figure 5-8. It is hinged at the top and it can be
removed by loosening one of the foot bolts and
sliding the support leg out from under the cap screw
(note that the foot is slotted). The leg can then be
rotated upward and half of the guard can be
disengaged (unhinged) from the other. Note that only
one side of the guard needs to be removed. To
reassemble simply reverse the above procedure.

Figure 5-8 Clamshell coupling guard

NEVER DO MAINTENANCE
WORK WHEN THE UNIT IS CONNECTED TO
POWER (Lock Out).

c) If the motor rotates in the wrong direction,

reverse any two of the three leads to the motor (3
phase current). Bump the motor again to ensure
the proper direction of rotation.

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Flowserve coupling guards are safety devices intended
to protect workers from inherent dangers of the rotating
pump shaft, motor shaft and coupling. It is intended to
prevent entry of hands, fingers or other body parts into a
point of hazard by reaching through, over, under or
around the guard. No standard coupling guard provides
complete protection from a disintegrating coupling.
Flowserve cannot guarantee their guards will completely
contain an exploding coupling.

The coupling guard shown in Figure 5-8 conforms to
the USA standard ASME B15.1,

Mechanical Power Transmission Apparatus.”

“Safety Standard for

Flowserve manufacturing facilities worldwide conform
to local coupling guard regulations.

5.5.2 ClearGuard™ - option

Flowserve offers as an option a ClearGuard™, which
allows you to see the condition of the coupling. (See
Figure 5-9.) This guard can be used in place of the
existing clamshell guard described above. The
following instructions enable the user to properly fit
this guard to the pump and motor.

Figure 5-9: ClearGuard™

5.5.2.1 Trimming and assembly instructions

In order to correctly fit the pump/motor configuration,
each ClearGuard must be trimmed to a specific
length. This trimming is done on the motor end of the
guard as described below. (See Figure 5-10.)

Figure 5-10: ClearGuard™ trimming

5.5.2.2 Trimming instructions

a) Measure minimum distance from the center of

mounting hole in the baseplate to the motor at
diameter as shown above.

b) Locate a reference center of the slot in the coupling

guard flange. Transfer measurement from Step a)
to the guard using this reference center.

c) Trim the motor end of guard according to the

above measurement. Trimming is best done with
a band saw, but most other types of manual or
power saws give acceptable results. Care must
be taken to ensure that there is no gap larger
than 6 mm (0.24 in.) between the motor and the
coupling guard.

d) Note: If motor diameter is smaller than guard

diameter, trim guard so that it extends over the
end of the motor as far as possible.

e) Deburr the trimmed end with a file or a sharp knife.

Care must be taken to eliminate all sharp edges.

5.5.2.3 Assembly instructions

f) Place the bottom and top halves of the

ClearGuard around the coupling.

g) Install the support legs by inserting and then

rotating the top flange of the leg through the slot
in the shell flange until it comes all the way
through and locks the top and bottom together.

h) Attach the support legs to the baseplate using the

fasteners and washers provided.

i) Install fasteners in the holes provided to secure

the guard flanges together.

5.6 Priming and auxiliary supplies

The standard Guardian G & H series pumps will not
move liquid unless the pump is primed. A pump is
said to be “primed” when the casing and the suction
piping are completely filled with liquid. Open
discharge valves a slight amount. This will allow any
entrapped air to escape and will normally allow the
pump to prime, if the suction source is above the
pump. When a condition exists where the suction
pressure may drop below the pump’s capability, it is
advisable to add a low-pressure control device to
shut the pump down when the pressure drops below
a predetermined minimum.

The Guardian Unitized self-priming centrifugal pumps
have a slightly different requirement regarding
priming. The initial priming liquid must be added to
the pump casing until the liquid has reached the
bottom of the suction nozzle. Once the initial prime is
in place, the pump will automatically replenish itself
and additional priming liquids are not normally
needed. If liquid is lost, additional priming liquid may
be needed.

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5.7 Starting the pump

a) Open the suction valve to full open position. It is

very important to leave the suction valve open
while the pump is operating. Any throttling or
adjusting of flow must be done through the
discharge valve. Partially closing the suction
valve can create serious NPSH and pump
performance problems.

Never operate pump with both the
suction and discharge valves closed. This could
cause an explosion.

b) Ensure the pump is primed. (See section 5.6.)
c) All cooling, heating, and flush lines must be

started and regulated.

d) Start the driver (typically, the electric motor).
e) Slowly open the discharge valve until the desired

flow is reached, keeping in mind the minimum
continuous flow listed in section 3.4.

It is important that the discharge
valve be opened within a short interval after
starting the driver. Failure to do this could cause
a dangerous build up of heat, and possibly an
explosion.

5.8 Running or operation

5.8.1 Minimum continuous flow

Minimum continuous stable flow is the lowest flow at
which the pump should be operated. The minimum
continuous flow (capacity) is established as a
percentage of the
section 3.4.4.

5.8.2 Minimum thermal flow

All Guardian G & H series pumps also have a

minimum thermal flow

minimum flow that will not cause an excessive
temperature rise. Minimum thermal flow is
application dependent.

minimum thermal flow, as this could cause an excessive
temperature rise. Contact a Flowserve Sales Engineer
for determination of minimum thermal flow.

Avoid running a centrifugal pump at drastically
reduced capacities or with discharge valve closed for
extended periods of time. This can cause severe
temperature rise and the liquid in the pump may
reach its boiling point. If this occurs, the internal
process-lubricated bearings will be exposed to vapor,
with no lubrication, and may be damaged or fail within
a very short period of time. Continued running under
these conditions when the suction valve is also

best efficiency point

. This is defined as the

Do not operate the pump below

(BEP). See

closed can create an explosive condition due to the
confined vapor at high pressure and temperature.

Thermostats may be used to safeguard against over
heating by shutting down the pump at a
predetermined temperature.

Safeguards should also be taken against possible
operation with a closed discharge valve, such as
installing a bypass back to the suction source. The
size of the bypass line and the required bypass flow
rate is a function of the input horsepower and the
allowable temperature rise.

5.8.3 Reduced head

Note that when discharge head drops, the pump’s
flow rate usually increases rapidly. Check motor for
temperature rise as this may cause overload. If
overloading occurs, throttle the discharge.

5.8.4 Surging condition

A rapidly closing discharge valve can cause a
damaging pressure surge. A dampening
arrangement should be provided in the piping.

5.8.5 Operation in sub-freezing conditions

When using the pump in sub-freezing conditions
where the pump is periodically idle, the pump should
be properly drained or protected with thermal devices
which will keep the liquid in the pump from freezing.

5.9 Stopping and shutdown

5.9.1 Shutdown considerations

When the pump is being shutdown, the procedure
should be the reverse of the start-up procedure.
First, slowly close the discharge valve, shutdown the
driver, then close the suction valve. Remember that
closing the suction valve while the pump is running is
a safety hazard and could seriously damage the
pump and other equipment.

5.9.2 Shutdown Guardian self-priming

At shutdown, the liquid in the discharge piping falls
back into the priming chamber and washes through
the impeller into the suction. The backflow creates a
siphon effect in the casing until the liquid level falls
below the bottom of the suction nozzle. The inertia of
the flow pulls fluid from the priming chamber to a
level lower than the initial priming fill. Though the
level is lower, there is still sufficient fluid in the
priming chamber to allow the pump to reprime itself.

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5.10 Hydraulic, mechanical and electrical
duty

5.10.1 Net positive suction head (NPSH)

Net positive suction head - available (NPSHA) is the
measure of the energy in a liquid above the vapor
pressure. It is used to determine the likelihood that a
fluid will vaporize in the pump. It is critical because a
centrifugal pump is designed to pump a liquid, not a
vapor. Vaporization in a pump will result in damage to
the pump, deterioration of the
(TDH), and possibly a complete stopping of pumping.

Net positive suction head - required (NPSHR) is the
decrease of fluid energy between the inlet of the
pump, and the point of lowest pressure in the pump.
This decrease occurs because of friction losses and
fluid accelerations in the inlet region of the pump and
particularly accelerations as the fluid enters the
impeller vanes. The value for NPSHR for the specific
pump purchased is given in the pump data sheet, and
on the pump performance curve.

For a pump to operate properly the NPSHA must be
greater than the NPSHR. Good practice dictates that
this margin should be at least 1.5 m (5 ft) or 20%,
whichever is greater.

Ensuring that NPSHA is larger than
NPSHR by the suggested margin will greatly enhance
pump performance and reliability. It will also reduce
the likelihood of cavitation, which can severely
damage the pump.

5.10.2 Specific gravity (SG)

Pump capacity and total head in meters (ft) of liquid
do not change with SG, however pressure displayed
on a pressure gauge is directly proportional to SG.
Power absorbed is also directly proportional to SG. It
is therefore important to check that any change in SG
will not overload the pump driver or over pressurize
the pump.

5.10.3 Viscosity

For a given flow rate the total head reduces with
increased viscosity and increases with reduced
viscosity. Also for a given flow rate the power
absorbed increases with the increased viscosity, and
reduces with reduced viscosity. It is important that
checks are made with your nearest Flowserve office if
changes in viscosity are planned.

5.10.4 Pump speed

Changing the pump speed affects flow, total head,
power absorbed, NPSHr, noise and vibration levels.
Flow varies in direct proportion to pump speed.

Total differential head

Head varies as speed ratio squared. Power varies as
speed ratio cubed. If increasing speed it is important
to ensure the maximum pump working pressure is not
exceeded, the driver is not overloaded,
NPSHa>NPSHr and that noise and vibration are
within local requirements and regulations.

6 MAINTENANCE

It is the plant operator's responsibility to ensure
that all maintenance, inspection and assembly work
is carried out by authorised and qualified personnel
who have adequately familiarized themselves with
the subject matter by studying this manual in detail.
(See also section 1.6.)

MAGNETIC FIELD PRESENT

This equipment may affect electronic equipment or
other devices that are influenced by magnetic fields.
Because magnetic drive pumps contain powerful
magnets, anyone with a pacemaker MUST NOT
disassemble these pumps nor enter areas where
disassembled pumps are likely to be. Also, keep all
credit cards, bank cards, watches, computer disks and
anything else which can be damaged by magnetic fields
away from these pumps when disassembled.

Any work on the machine must be performed when it
is at a standstill. It is imperative that the procedure
for shutting down the machine is followed, as
described in section 5.9.

On completion of work all guards and safety devices
must be re-installed and made operative again.

Before restarting the machine, the relevant
instructions listed in section 5,

up, operation and shut down,

Oil and grease leaks may make the
ground slippery. Machine maintenance must
always begin and finish by cleaning the ground
and the exterior of the machine.

If platforms, stairs and guard rails are required for
maintenance, they must be placed for easy access to
areas where maintenance and inspection are to be
carried out. The positioning of these accessories
must not limit access or hinder the lifting of the part to
be serviced.

When air or compressed inert gas is used in the
maintenance process, the operator and anyone in the
vicinity must be careful and have the appropriate
protection.

Commissioning, start

must be observed.

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Do not spray air or compressed inert gas on skin. Do
not direct an air or gas jet towards other people. Never
use air or compressed inert gas to clean clothes.

Before working on the pump, take measures to
prevent the pump from being accidentally started.
Place a warning sign on the starting device:

"Machine under repair: do not start"

With electric drive equipment, lock the main switch
open and withdraw any fuses. Put a warning sign on
the fuse box or main switch:

"Machine under repair: do not connect".

Never clean equipment with flammable solvents or
carbon tetrachloride. Protect yourself against toxic
fumes when using cleaning agents.

Refer to the parts list shown in section 8 for item
number references used throughout this section.

.

6.1 Maintenance schedule

It is recommended that a maintenance plan and
schedule be implemented, in accordance with these
User Instructions, to include the following:

•

Any auxiliary systems installed must be monitored,

if necessary, to ensure they function correctly.

•

Check for any leaks from gaskets and seals.

•

Check bearing lubricant level, and the remaining

hours before a lubricant change is required.

•

Check that the duty condition is in the safe

operating range for the pump.

•

Check vibration, noise level and surface

temperature at the bearings to confirm
satisfactory operation.

•

Check dirt and dust is removed from areas around

close clearances, bearing housings and motors.

•

Check coupling alignment and align if needed.

6.1.1 Preventive maintenance

The following sections of this manual give instructions
on how to perform a complete maintenance overhaul.
However, it is also important to periodically repeat the

Pre start-up checks

checks will help extend pump life as well as the
length of time between major overhauls.

6.1.2 Need for maintenance records

A procedure for keeping accurate maintenance
records is a critical part of any program to improve
pump reliability. There are many variables that can
contribute to pump failures. Often long term and
repetitive problems can only be solved by analyzing
these variables through pump maintenance records.

listed in section 5.1. These

6.1.3 Cleanliness

One of the major causes of pump failure is the presence
of contaminants in the bearing housing. This
contamination can be in the form of moisture, dust, dirt
and other solid particles such as metal chips. Dirt in the
impeller threads could cause the impeller to not be
seated properly against the shaft. This, in turn, could
cause a series of other problems. For these reasons, it
is very important that proper cleanliness be maintained.
Some guidelines are listed below:

•

After draining the oil from the bearing housing,

periodically send it out for analysis. If it is
contaminated, determine the cause and correct.

•

The work area should be clean and free from

dust, dirt, oil, grease etc.

•

Hands and gloves should be clean.

•

Only clean towels, rags, and tools should be used.

6.2 Spare parts

The decision on what spare parts to stock varies greatly
depending on many factors such as the criticality of the
application, the time required to buy and receive new
spares, the erosive/corrosive nature of the application,
and the cost of the spare part. Section 8 identifies all of
the components that make up each pump addressed in
this manual. Please refer to the

Pump Parts Catalog

this book can be obtained from your local Flowserve
Sales Engineer or Distributor/Representative.

please consult your local Flowserve sales
representative.

6.2.1 Ordering of spare parts

Flowserve keeps records of all pumps that have been
supplied. Spare parts can be ordered from your local
Flowserve Sales Engineer or from a Flowserve
Distributor or Representative. When ordering spare
parts the following information should be supplied:

1) Pump serial number

2) Pump size and type

3) Part name – see section 8

4) Part item number – see section 8

5) Material of construction (alloy)

6) Number of parts required

The pump size and serial number can be found on
the name plate located on the bearing housing. (See
Figure 3-1.)

for more information. A copy of

Prior to resizing impellers in nickel,

Flowserve Mark 3

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6.3 Recommended spares and
consumables

On very critical services, where downtime is especially
crucial it may be best to stock spare pumps or the
rotating assembly, allowing complete service to be
quickly restored. The damaged assembly can be taken
to a shop, repaired and stored for back-up.

6.4 Tools required

Do not perform maintenance on a steel workbench.
The magnets present in the pump are strongly attracted
to ferrous materials. Use a non-magnetic (such as
wood or plastic) workbench instead. The use of non
magnetic tools is also recommended. See Figure 6-1
for a list of recommended maintenance tools.

Figure 6-1: Recommended maintenance tools –
Guardian G & H Series pumps

Task Section Group 1 Group 2

Power end
back pullout

Complete
pullout

Disassembly
/assembly

6.7.1

6.7.2

6.7.3 to

6.9.5

¾ in. open end

wrench
5/8 in. socket
9/16 in. socket
¾ in. open end

wrench
¾ in. socket

Torque wrench
Arbor or bench

press
Rubber mallet
Durco impeller

wrench
Coupling key
1-1/2 in. open end

wrench
7/16 in. wrench
3/16 in. hex head

wrench
¾ in. socket
½ in. socket

¾ in. open end

wrench
5/8 in. socket
9/16 in. socket
¾ in. open end

wrench
15/16 in. socket
Torque wrench
Arbor or bench

press
Rubber mallet
Durco impeller

wrench
Coupling key
1-5/8 in. open end

wrench
9/16 in. wrench
1/2 in. wrench
5/16 in. hex head

wrench
9/16 in. socket
Spanner wrench

6.5 Fastener torques

See Figure 6-2 for recommended fastener torques for
Guardian G & H series pumps.

Figure 6-2: Recommended bolt torques

Item Description

222 Pump shaft cap 34 (25) 47 (35)

6570.3

6570.4

6570.5 Bearing housing to adapter 15 (11) 15 (11)

6570.6

6570.8

6580.1 Pump casing to adapter (1/2 in.) 34 (25) 34 (25)

6580.1 Pump casing to adapter (5/8 in.) n/a 61 (45)

Bearing housing cap to bearing

housing

Bearing housing foot to bearing

housing

Containment shell to bearing

holder

Outer magnet flange to power

end shaft

Group 1

Nm (lbf•ft)

11 (8) 41 (30)

34 (25) 127 (94)

15 (11) 34 (25)

7 (5) 7 (5)

Group 2

Nm (lbf•ft)

6.6 Setting impeller clearance

A new impeller gasket [4590.2] must be installed
whenever the impeller has been removed from the
shaft. Impeller clearance settings may be found in
Section 5.3

6.6.1 Installation and clearance setting for
Guardian G & H series reverse vane
impellers

Install the impeller [2200] by screwing it onto the shaft
(use heavy gloves) until it firmly seats against the
shaft shoulder.

The impeller could have sharp edges,
which could cause an injury. It is very important to
wear heavy gloves.

Tighten the impeller with the impeller wrench from the
Flowserve Mark 3 tool kit. To do this, grasp the impeller
in both hands and, with the impeller wrench handle to the
left (viewed from the impeller end of the shaft) spin the
impeller forcefully in a clockwise direction to impact the
impeller wrench handle on the work surface to the right.

6.6.2 Setting the impeller clearance

a) Temporarily tighten the impeller [2200] to the

pump shaft [2100.1]. Turn the impeller in a
clockwise direction until the impeller is firmly
seated but only hand tight.

Do not attempt to tighten the
impeller on the shaft by hitting the impeller with a
hammer or any other object or by inserting a pry bar
between the impeller vanes. Serious damage to
the impeller may result from such actions.

b) Place the entire assembly vertically on the

workbench with the impeller down and supporting
the weight of the assembly. Measure the
minimum clearance between the bearing holder
face [3830] and the impeller [2200] with a feeler
gauge without forcing the impeller away from the
face. Measure the clearance between the bearing
holder and ALL THE VANES to determine closest
vane. Use the smallest measurement as your
guide and record this number.

c) The Guardian Magnetic Drive requires a

clearance of 0.45 ±0.08mm (0.018 ±0.003 in.),
regardless of operating temperature, between the
closest impeller vane and the face of the bearing
holder. Determine the number of shims that must
be placed between the impeller and the thrust
collar by subtracting the minimum clearance
between the bearing holder and the impeller from
the thickness of the impeller shims already
inserted. Add 0.45 mm (0.018 in.) to this

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difference. This number is the thickness of shims
that are required to adjust the impeller.

For example, if the initial measurement between the
closest impeller vane and the bearing holder face is

0.75 mm (0.030 in.), and the thickness of the shims
already inserted is 1.00 mm (0.040 in.), use

1.00 mm – 0.75 mm = 0.25 mm
(0.040 in. – 0.030 in. = 0.010 in.)

Next, add 0.45 mm (0.018 in.) to 0.25 mm
(0.010 in.) to determine the thickness of the
shims required to adjust the impeller properly.

0.25 mm + 0.45 mm = 0.70 mm
(0.010 in. + 0.018 in. = 0.028 in.)

A combination of shims equal to 0.70 mm
(0.028 in.) thickness would then be required to
set the impeller properly.

d) Set the assembly back to horizontal. Remove

the impeller and the 1.00 mm (0.040 in.)
combination of shims from the pump shaft.
Removal should only require using your hands
since the impeller was only hand tightened. If
necessary, use the Durco impeller wrench to hold
the shaft stationary.

e) Place the required number of shims against the

shoulder in the thrust collar [3610] or thrust collar
ring [207]. Thread the impeller back onto the pump
shaft and tighten as described in step 1. Make sure
the shims sit flat between mating faces.

f) Recheck the impeller clearance as described in

step b). If the distance is more or less than
required, repeat steps c) through f) until
clearance is correct.

g) When the clearance is properly set, set the

assembly back to horizontal. Remove the
impeller and thrust collar [3610].

Group 1.

Place the thrust collar/pump shaft O-ring
[4610.4] in the groove on the back side of the thrust
collar. Stretch the thrust collar ring/O-ring [4610.5]
over the hub on the backside of the impeller.

Group 2.

Remove the thrust collar ring and shims
from the thrust collar. Place the thrust collar/ring
O-ring [4610.5] into the O-ring groove on the
shimming side of the thrust collar. Using an arbor
press, press the thrust collar ring and shims into
the thrust collar. In order to keep the shims from
falling out of the thrust collar during this press, the
ring should be placed on the work surface with the
thrust collar on top of it. Place the thrust
collar/pump shaft O-ring [4610.4] into the groove
on the pump shaft side of the thrust collar. Place
the thrust collar into the bearing holder [3830] so
the thrust journal sits flat on the grooved portion of
the T-shaped bushing [3300.1].

h) Install new impeller gasket (4590.2) and tighten

the impeller until it is firmly seated.

Failure to tighten the impeller
sufficiently may allow liquid to reach the impeller
thread. Additionally, a loose impeller will be
tightened when the pump is started, but may be
very difficult to remove later.

The impeller will be difficult to turn
because there is deformation of the O-rings
during seating of the impeller.

6.7 Disassembly

a) Before performing any maintenance, disconnect the

driver from its power supply and lock it off line.

Lock out power to driver to prevent

personal injury.

b) Close the discharge and suction valves, and

drain all liquid from the pump.

c) Close all valves on auxiliary equipment and

piping, then disconnect all auxiliary piping.

d) Decontaminate the pump as necessary.

If Flowserve Guardian G & H
series pumps contain dangerous chemicals, it is
important to follow plant safety guidelines to
avoid personal injury or death.

6.7.1 Power end removal without breaking
process containment

At this point, it may be necessary to detach some of
the instrumentation.

By following the steps in sections 6.7.1.1 or

6.7.1.2, the process fluid is contained and the power

end can be completely removed. This procedure
does not preclude the use of personal protective
gear. Personnel should follow their standard plant
safety practices.

6.7.1.1 Long-coupled Guardian G & H series

Figure 6-3A: Power end removal with process
contained by wet end

pumps

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a) Remove coupling guard.
b) Remove the spacer coupling.
c) Loosen the cap screw(s) holding the bearing

housing foot to the baseplate.

d) To remove the power end from the wet end,

remove the four (4) bearing housing/adapter
fasteners [6570.5]. The magnetic coupling will
remain connected due to the radial and axial
forces of the magnets.

e) Screw the four (4) square head jackbolts [6575] in

the bearing housing through the threaded taps until
each comes into contact with the adapter. Continue
to screw all jackbolts in evenly to detach the wet
end from the power end. (Figure 6-3A.)

Do not attempt to remove the
power end by any other method. The magnetic
force can cause severe personal injury.

Be sure to separate the inner and
outer magnet assemblies evenly. Cocking of the
two can result in serious damage to the magnets
and/or containment shell. It is best to alternatively
give each bolt a turn to ensure proper and even
separation.

Depending on pump size and magnet
length, it may be necessary to move the motor to
complete step e).

f) To disassemble the power end, follow steps a)

through g) in Section 6.7.5.

6.7.1.2 Close-coupled Guardian G & H series
pumps

Continue to screw both jackscrews evenly to
disengage the motor from the wet end of the pump.
(See Figure 6-3B.) It is best to alternate from one
jackscrew to the other to ensure even separation.

Do not attempt to remove the
motor/outer magnet assembly from the wet end
by any other method. The magnetic force can
cause severe personal injury.

d) To complete the disassembly of the close-

coupled drive end, see Section 6.7.5.2.

6.7.2 Removing the entire pump assembly from
the casing

Small amounts of liquid may be trapped in the
casing and/or containment area. Proper
decontamination is the responsibility of the user.

Drain and flush the pump before proceeding to
Sections 6.7.2.1 or 6.7.2.2. The Guardian Magnetic
Drive pump is designed to handle corrosive, toxic,
and hazardous process fluids and may need to be
decontaminated prior to any disassembly.

6.7.2.1 Long-coupled Guardian G & H series

pumps

Figure 6-4: Removing entire pump assembly from
casing

Figure 6-3B

a) Loosen the fasteners (if applicable) holding the

motor to the baseplate.

b) Remove the four (4) fasteners [6570.10] that hold

the motor flange [251] to the lantern [3132].

c) Engage the two (2) square head jackscrews [6575]

that are located at the 3 o’clock and 9 o’clock
positions on the lantern [3132] until each jackscrew
comes in contact with the motor flange [251].

Page 39 of 68

a) Remove the spacer from the spacer coupling.
b) For the larger pumps, attach lifting equipment to

the pump. Place the equipment in light tension to
support the pump when it is removed from the
casing.

c) All maintenance can be performed without casing

removal from the piping. To remove the back
pullout pump assembly from the casing, remove
all casing fastener nuts [6580] from the
casing/adapter fasteners [6572]. (Figure 6-4.)

d) Remove the cap screw(s) holding the bearing

housing foot to the baseplate.

e) Move the back pullout pump assembly toward the

motor and rotate the unit out, leaving the casing
in place. (Figure 6-4.)

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

In the event the pump assembly is lodged in the
casing, two jackscrew locations 180 degrees
apart are provided on the adapter [1340]. Inspect
the casing [1100] and the face of the bearing
holder for wear, corrosion, or defects. Remove
the bearing holder/casing gasket [4590.1]. It is
recommended that all O-rings and gaskets be
replaced each time the pump is disassembled.

f) The entire pump without the casing [1100] can

now be moved to the repair shop.

6.7.2.2 Close-coupled Guardian G & H series
pumps

Figure 6-5: Removing entire pump less casing

a) Drain and flush the pump. The Guardian

Magnetic Drive pump is designed to handle
corrosive, toxic, and hazardous process fluids
and may need to be decontaminated prior to any
disassembly.

b) Remove the motor/outer magnet assembly by

following the steps outlined in Section 6.7.1.2.

c) All maintenance can be performed without

removing the casing from the piping. To remove
the pump assembly from the casing, remove all
casing fastener nuts [6580] from the
casing/adapter fasteners [6572].

d) Remove the capscrew holding the lantern foot to

the baseplate (if applicable).

e) Move the pump assembly back from the casing

and rotate the unit out of the casing. (Figure 6-5.)
In the event the pump assembly is lodged in the
casing, two jackscrew locations 180 º apart are
provided on the adapter [1340].

f) Inspect the casing [1100] and the face of the

bearing holder [3830] for wear, corrosion, or
defects. Remove the bearing holder/casing
gasket [4590.1]. It is recommended that all o­rings and gaskets be replaced each time the
pump is disassembled.

g) The entire pump without the casing [1100] can

now be moved to the repair shop.

h) To remove the lantern [3132] from the wet end,

orient the back pullout assembly vertically on the
impeller. (Figure 6-6.) Remove the four (4)
lantern/adapter fasteners [6570.5]. Remove the
lantern [3132] by lifting it straight up from the
adapter [1340].

Figure 6-6: Lantern removal

The lantern [3132] is manufactured
from ductile cast iron and may attach to the
containment shell [224] upon removal due to
attraction of the inner magnet assembly.

i) The entire pump without the casing [1100] can

now be moved to the repair shop.

6.7.3 Detaching the wet end from the power end

At this point, it may be necessary to detach some of
the instrumentation.
a) To remove the power end from the wet end, remove

the four (4) bearing housing/adapter fasteners
[6570.5]. (Figures 6-3A & B.) The magnetic
coupling will remain connected due to the magnetic
forces.

b) Screw the four (4) square head jackbolts [6575]

in the bearing housing [3200] through the
threaded holes until each comes into contact with
a recessed hole in the adapter [1340]. For close
coupled pumps, there are only two (2) jackbolts
[6575]. Continue to screw all jackbolts in evenly
to detach the wet end from the power end.

Do not attempt to remove the power end
from the wet end by any other method. The
magnetic force can cause severe personal injury.

Be sure to separate the inner and
outer magnet assemblies evenly. Cocking of the two
can result in serious damage to the magnets and/or
containment shell. It is best to alternately give each
bolt a turn to ensure proper and even separation.

6.7.4 Disassembling the wet end

Handle the journal and bushing materials with care.
These parts are easily chipped and damaged.
a) Remove the six (6) retainer ring/containment

shell fasteners [6570.6]. Remove the retainer
ring [228]. In case the retainer ring [228] is
lodged in place, two jackscrew locations are
provided to aid in removal. (Figure 6-7.)

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6.7.4.1 Figure 6-7: Wet end assembly

b) Remove and discard retainer ring/bearing

housing O-ring [4610.1]. Remove the adapter
[1340] from the bearing holder. Remove and
discard O-ring [4610.7].

c) Remove the containment shell [224]. Remove

the bearing holder/containment shell O-ring
[4610.3] from the bearing holder [3830] and
discard. (Figure 6-8.)

Figure 6-8: Containment shell removal

d) Remove impeller [2200] from pump shaft [2100.1].

Remove the impeller by rapping the impeller vane
carefully with a hard rubber or leather mallet while
holding the inner magnet stationary.

Group 1.

To hold inner magnet stationary, place
a wrench on the flats at the rear of the inner
magnet (the impeller threads are right hand).

Group 2 (JG/JH - MG/MH couplings).

To hold
inner magnet stationary, place a wrench on the
flats at the rear of the inner magnet (the impeller
threads are right hand).

Group 2 (NG/NH - QG/QH couplings).

To hold
inner magnet stationary, place an adjustable
spanner wrench in the two 5 mm (3/16 in.)
diameter holes at the rear of the inner magnet.

Be careful not to contact the bearing holder face
while removing the impeller. Do not bend the
impeller vanes. (Figure 6-10.)

Figure 6-10: Impeller/bearing holder

Close-coupled pumps ONLY.

Before removing
impeller from the pump shaft, the impeller fastener
[2913] and O-ring [4610.8] must be removed from
the center of the impeller. (See Figure 6-9.)

Figure 6-9: Impeller/fastener schematic

e)

Group 1.

Remove the thrust collar [3610] and
thrust journal [211] from the bearing holder
[3830]. (Figure 6-11.)

Group 2.

Remove the thrust collar [3610], thrust
collar ring [207] and thrust journal [211] from the
bearing holder [3830].

Figure 6-11: Thrust collar

f) Remove the thrust collar/ring O-ring [4610.5] and

the thrust collar/pump shaft O-ring [4610.4] from
the thrust collar and discard. Save and protect
the impeller setting shims [3126.2] for
reassembly.

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g) Remove the inner magnet [220] and pump shaft

(2100.1) from the bearing holder [3830]. Keep
the shaft in line with the bearing holder as it is
removed so as to avoid cocking the assembly in
the holder. (Figure 6-12.) Avoid prying or tapping
the assembly when removing.

Figure 6-12: Inner magnet/shaft assembly

h) Remove the T-shaped outboard bushing [216] from

the bearing holder [3830]. (Figure 6-13.) H Series
pumps utilize an alloy cartridge to hold both the
inboard [212] and outboard bushing [216] in the
bearing holder. These cartridges are assembled at
the factory. Do not attempt to disassemble bushing
from cartridge. (Figure 6-14.)

Figure 6-13: Bearing holder with outboard bushing

Figure 6-14: Bushings

If disassembly of the inner magnet
assembly/pump shaft is required, follow steps i)
and j). Disassembly is necessary if the pump
shaft [2100.1] or inner magnet [220] needs to be
replaced. Otherwise, skip to Section 6.7.5.

Newer Guardian pumps have shaft
caps [222] that are LEFT HAND thread. These
are indicated by an “LH” stamped into the end of
the cap. Older pumps that do not have the “LH”
marking utilize right hand threads. All
replacement shafts/caps will have left hand
threads.

i) Unscrew the pump shaft cap [222]. Remove the

cap/inner magnet O-ring [4610.6] and discard. Pull
the pump shaft out and remove the pump shaft key
[6700.2]. Remove the pump shaft gasket [4590.6]
and discard. Remove the silicon carbide thrust
journal [217] from the inner magnet assembly [220].
(Figure 6-15.) If the silicon carbide journal is lodged
in place, use the two holes in the inner magnet to
push the journal out. If the pump shaft or pump
shaft journal [213] does not need replacement, stop
here and do not perform step j) because the wet
end disassembly is complete. However, if the
pump shaft or pump shaft journal does need
replacement, proceed to step j).

Figure 6-15: Outboard thrust journal

Group 1 inboard and outboard
bushings and thrust journals are NOT
interchangeable.

Group 2 inboard and outboard bushings are
interchangeable – be sure to mark inboard vs.
outboard upon removal for later evaluation.

Group 2 inboard and outboard thrust journals are
NOT interchangeable.

Remove the inboard T-shaped bushing [212]
from the bearing holder.

Page 42 of 68

Wear eye/hand protection as shaft journal

is broken.

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

j) To remove the pump shaft journal [213] from the

pump shaft [2100.1]. (Figure 6-16.) Wrap the
part in a rag and strike the pump shaft journal
[213] with a hard object to break it. Remove the
shaft gasket [4590.6] and discard. (Figure 6-17.)
Remove the tolerance rings [241] and discard.

Do not reuse the tolerance rings.

The disassembly of the wet end is now complete.

Figure 6-16: Group 1 pump shaft/journal
assembly

Figure 6-17: Group 1 shaft with mounted
tolerance rings

Figure 6-20: “Oil level must be maintained at
center of sight glass”

6.7.5 Disassembling the power end

Be aware of strong magnetic forces of
the outer magnets. Keep magnetic material away
from these magnets. Observe previous warnings
concerning these magnets.

6.7.5.1 Long-coupled Guardian G & H series

pumps

Figure 6-21: Power end major components

Figure 6-18: Group 2 shaft with mounted
tolerance rings

Figure 6-19: Group 1 shaft with unmounted
tolerance rings

This procedure is necessary if the outer
magnet assembly, anti-friction bearings or oil seals must
be replaced. See Figure 6-52 for recommendations on
ball bearing relubrication intervals.
a) Drain the oil in the bearing housing by removing

the bearing housing drain plug [6569.1]. Put the
bearing housing drain plug back into place after
the bearing housing is drained.

b) Remove reverse rotation screw [6570.8] with hex

head wrench. The threads are right hand.

c) Unscrew the outer magnet/flange assembly

[230/231] from the drive shaft [2100.2]. Mount
the drive shaft/coupling key [6700] and a Durco
impeller wrench on the shaft. With the wrench
handle pointing to the right when viewed from the
magnet side of the bearing housing [3200], grasp
the magnet firmly.

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Spin it rapidly in a counterclockwise direction so
that the wrench handle makes a solid impact with
the work surface to the left of the housing. After
several sharp raps, the outer magnet/flange
assembly should be free and easily removed. It
is recommended that the magnet assemblies be
stored in plastic bags to avoid the necessity to
clean later.

The threads are right hand.

d) Remove the three (3) bearing cover fasteners

[6570.3] and bearing cover [3260]. Remove the
bearing cover/bearing housing O-ring [4610.2]
and discard. Pull the drive shaft and bearing
assembly out of the bearing housing in one
straight motion. Avoid cocking the assembly in
the housing. Remove the wavy washer [127A].
(Figure 6-21.)

e) If the pump is provided with oil lip seals, it is

recommended that these items be replaced during
each pump rebuild. Lip seals [4310.1, 4310.2] can
be removed from the bearing housing using an
arbor press or tapped out using a flat punch.

f) If necessary, remove the bearing housing foot

[3134] by unscrewing the footpiece fastener
[6570.4] from the bearing housing. A shim
[3126.1] may also be present.

g) If the ball bearings [3011, 3013] need to be

replaced, remove the bearings from the drive
shaft. If the bearings are to be replaced and the
drive shaft reused, extra care should be taken so
as not to damage the drive shaft. Remove the
bearings with a bearing puller. Even pressure
should be applied to the inner bearing race only.
It is recommended that the bearings not be
reused if they are removed from the drive shaft.

Keep contaminants out of the

bearing housing and bearings.

h) The power end disassembly is complete.

6.7.5.2 Close-coupled Guardian G & H series
pumps – outer magnet/motor
disassembly

This procedure is necessary only if the outer
magnet assembly [230/231] or motor must be replaced.
a) Loosen the set screw the attaches the outer

magnet assembly [230/231] to the motor shaft.
(See Figure 6-22.)

b) Remove the outer magnet assembly [230/231]

from the motor shaft. As a disassembly aide, a
threaded hole has been provided in the center of
the outer magnet flange [231] to enable the outer
magnet flange to be jacked off of the motor shaft.

One of the square head jackscrews [6575] from
the lantern [3132] can be used for this step.

c) Remove the fasteners that attach the outer

magnet flange [231] to the hub [245].

d) To remove the motor flange [251] from the motor,

remove the four (4) motor flange/motor fasteners
[6570.11].

Figure 6-22: Outer magnet/motor assembly

e) Outer magnet/motor disassembly is complete.

6.8 Examination of parts

Cleaning/inspection

Clean all of the parts using a non-flammable solvent
cleaner and inspect them for damage, wear and
corrosion. Replace worn with new genuine
Flowserve parts. Clean all the O-ring grooves
thoroughly and remove any burrs from the grooves.
The pump shaft journal should be carefully inspected.
Particular attention should be given to the impeller
threads, lip seals, magnetic coupling and all bearings.

It is important that only non-flammable,
non-contaminated cleaning fluids are used. These
fluids must comply with plant safety and environmental
guidelines.

Critical measurements and tolerances

To maximize reliability of pumps, it is important that
certain parameters and dimensions are measured
and maintained within specified tolerances. It is
important that all parts be checked. Any parts that do
not conform to the specifications should be replaced
with new Flowserve parts.

Parameters that should be checked by users

Flowserve recommends that the user check the
following measurements and tolerances whenever
pump maintenance is performed. Each of these
measurements is described in more detail on the
following pages.

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Group 1

6.8.1 Wet end

a) Inspect the casing, impeller, bearing holder and

inner magnet for wear, corrosion and defects.

b) Inspect the pins in the inner magnet, bearing

holder and thrust collar for diametrical wear. The
nominal diameter of these pins is 4.737 mm
(0.1865 in.). Replace these pins if diametrical
wear exceeds 0.508 mm (0.020 in.). These pins
must be press fit using an arbor press. The height
of the pins above the surface they are pressed into
must not exceed 2.92 mm (0.115 in.) but not be
less than 2.16 mm (0.085 in.).

c) Inspect the bushings and thrust journals for wear.

Measure the thickness of the inboard thrust journal
and the thickness of the flange on the inboard
bushing. The nominal thicknesses for these parts
can be found in Figure 6-23. If the sum of the
axial wear on these two parts exceeds 0.38 mm
(0.015 in.), replace these parts immediately.
Repeat this inspection for the outboard bushing
and outboard thrust journal. The sum of the axial
wear must not exceed 0.38 mm (0.015 in.) on the
outboard components.

d) Inspect the shaft journal and bushings for

diametrical wear. Total diametrical wear must
not exceed 0.610 mm (0.024 in.). Measure the
outside diameter of the shaft journal and the
inside diameter of the bushings. The nominal
diameters for these parts can be found in Figure
6-23. If the sum of the wear on the shaft journal
and its corresponding bushing exceeds the
allowable diametrical wear, identify the worn
parts and replace them immediately.

Figure 6-23: Wet end bearings allowable wear

Total axial allowable wear 0.38 mm (0.015 in.)
Total diametrical allowable wear 0.61 mm (0.024 in.)

BUSHING AND JOURNAL DIMENSIONS AS NEW

Thrust journal

Group 2

Note:

Dimensions shown above are in millimeters (inches).

thickness

I.B. O.B.

4.737

(0.1865)

4.737

(0.1865)

6.337

(0.2495)

4.737

(0.1865)

Bushing

flange

thickness

9.45

(0.372)

9.45

(0.372)

Bushing

I.D.

34.938

(1.3755)

47.377

(1.8755)

Shaft

journal

O.D.

34.87

(1.373)

47.536

(1.8715)

e) Inspect the containment shell to ensure the

allowable corrosion limit has not been exceeded.
The containment shell thickness is 1.27 mm
(0.050 in.) as new and the allowable corrosion is

0.635 mm (0.025 in.), 150 lb Class [0.508 mm
(0.020 in.), 300 lb Class].

f) All wet end O-rings and gaskets must be

replaced. Inspect O-ring grooves for integrity. It
is good practice to replace all O-rings.

6.8.2 Power end

a) Inspect the outer magnet rub pads for wear. The

height of the rub pads above the magnet outer
diameter is 1.0 mm (0.04 in.) as new. If wear is
greater than 0.5 mm (0.02 in.), then the rub pads
should be replaced. The primary cause of worn
rub pads is an anti-friction bearing failure.

b) Inspect the anti-friction bearings for scoring,

pitting, scratching and rusting.

Use of replacement parts not
provided by Flowserve may result in premature
pump failure, excessive damage to equipment, or
personal injury. Use of non OEM or
remanufactured parts voids all warranties provided.

Additional parameters checked by Flowserve

The parameters listed below are somewhat more
difficult to measure and/or may require specialized
equipment. For this reason, they are not typically
checked by our customers, although they are
monitored by Flowserve during the manufacturing
and/or design process.

6.8.3 Shaft

Replace if grooved, pitted or worn. Prior to mounting
bearings or installing the shaft into the bearing
housing, check the following parameters.

6.8.3.1 Diameter/tolerance, under bearings

In order to ensure proper fit between the shaft and
bearings, verify that both the inboard (IB) and
outboard (OB) shaft diameter is consistently within
the minimum/maximum values shown in Figure 6-24.
A micrometer should be used to check these outside
diameter (OD) dimensions on the shaft.

Figure 6-24

Group 1 Group 2

IB and OB
bearing/
shaft
mm (in.)

Bearing

Shaft

Fit

35.000/34.989

(1.3780/1.3775)

35.014/35.004

(1.3785/1.3781)

0.025T/0.004T

(0.0010T/0.0001T)

50.000/49.987

(1.9685/1.9680)

50.013/50.003

(1.9690/1.9686)

0.026T/0.003T

(0.0010T/0.0001T)

6.8.4 Bearings

It is recommended that bearings not be re-used after
removal from the shaft. Prior to mounting bearings,
check the following parameters.

6.8.4.1 Diameter/tolerance, inside diameter

In order to ensure proper fit between bearings and
the shaft, verify that the inside diameter (ID) of both
the IB and OB bearing are consistently within the
minimum/maximum values shown in Figure 6-24. An
inside caliper should be used to check these ID
diameters on the bearings.

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6.8.4.2 Diameter tolerance, outside diameter

In order to ensure proper fit between bearings and
the bearing housing, verify that the OD on both the IB
and OB bearings are consistently within the
minimum/maximum values shown in Figure 6-25. A
micrometer should be used to check these outside
diameter (OD) dimensions on the bearings.

Figure 6-25

Group 1 Group 2

IB and OB
bearing/
housing
mm (in.)

Bearing

Housing

Fit

79.992/79.987

(3.1493/3.1491)

80.020/80.005

(3.1504/3.1498)

0.033L/0.013L

(0.0013L/0.0005L)

110.000/109.985
(4.3307/4.3301)

110.023/110.007
(4.3316/4.3310)

0.038L/0.008L

(0.0015L/0.0003L)

6.8.5 Impeller balancing

Shaft whip is deflection where the centerline of the
impeller is moving around the true axis of the pump.
It is not caused by hydraulic force but rather by an
imbalance with the rotating element. Shaft whip can
be very hard on the wetted bearings due to the
resulting vibration imparted into the pump. To
minimize shaft whip it is imperative that the impeller is
balanced.

All impellers manufactured by Flowserve are
balanced after they are trimmed. If for any reason, a
customer trims an impeller, it must be re-balanced.

The maximum values of acceptable unbalance are:

•

1 500 r/min: 40 g·mm/kg

(1 800 r/min: 0.021 oz-in/lb) of mass.

•

2 900 rpm: 20 g·mm/kg

(3 600 rpm: 0.011 oz-in/lb) of mass.

Flowserve performs a single plane spin balance on all
Guardian impellers. All balancing is performed to the
ISO 1940 Grade 6.3 tolerance criteria.

6.8.6 Bearing housing

Prior to installing the shaft into the bearing housing,
check the following parameters.

6.8.6.1 Diameter/tolerance, at bearing surface

In order to ensure proper fit between the bearing
housing and the bearings, verify that the ID of both
the IB and OB bearing surfaces are consistently
within the minimum/maximum values shown in Figure
6-25. An inside caliper should be used to check
these ID dimensions in the bearing housing.

6.8.6.2 Alignment

Misalignment of the pump and motor shafts can
cause the following problems:

•

Failure of the motor and/or pump bearings

•

Failure of the coupling

•

Excessive vibration/noise

The schematics below show the technique for a typical
rim and face alignment using a dial indicator. It is
important that this alignment be done after the flanges
are loaded, and at typical operating temperatures. If
proper alignment cannot be maintained a stilt/spring
mounting should be considered.

Alignment

Many companies today are using laser alignment
which is a more sophisticated and accurate
technique. With this method a laser and sensor
measure misalignment. This is fed to a computer
with a graphic display that shows the required
adjustment for each of the motor feet.

See section 4.8 for recommended final shaft
alignment limits.

6.8.6.3 Vibration analysis

Vibration analysis is a type of condition monitoring
where a pump’s vibration “signature” is monitored on
a regular, periodic basis. The primary goal of
vibration analysis is extension on MTBPM. By using
this tool Flowserve can often determine not only the
existence of a problem before it becomes serious, but
also the root cause and possible solution.

Modern vibration analysis equipment not only detects
if a vibration problem exists, but can also suggest the
cause of the problem. On a centrifugal pump, these
causes can include the following: unbalance,
misalignment, defective bearings, resonance,
hydraulic forces, cavitation and recirculation. Once
identified, the problem can be corrected, leading to
increased MTBPM for the pump.

Flowserve does not make vibration analysis equipment,
however Flowserve strongly urges customers to work
with an equipment supplier or consultant to establish an
on-going vibration analysis program.

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6.9 Assembly of pump

It is important that all pipe threads be
sealed properly. Flowserve does not recommend the
use of PTFE tape as a thread sealant.

Flowserve has investigated and tested alternate
sealants and has identified two that provide an effective
seal, have the same chemical resistance as the tape.
These are La-co Slic-Tite and Bakerseal. Both products
contain finely ground PTFE particles in an oil based
carrier. They are supplied in a paste form which is
brushed onto the male pipe threads. Flowserve
recommends using one of these paste sealants.

Full thread length engagement is required for all
fasteners.

Refer to Figure 6-2 for recommended bolt

torques.

6.9.1 Power end assembly

6.9.1.1 Bearing installation

Mounting of bearings on shafts must be done in a
clean environment. Bearing and power end life can
be drastically reduced if even very small foreign
particles work their way into the bearings. Wear
clean gloves.

Bearings should be removed from their protective
packaging only immediately before assembly to limit
exposure to possible contamination. After removing
the packaging they should only come in contact with
clean hands, fixtures, tools and work surfaces.

The chart shown in Figure 6-26 gives the SKF part
numbers for bearings in Flowserve Guardian G & H
Series pumps. Note that the term “inboard bearing”
refers to the bearing nearest to the casing. “Outboard
bearing” refers to the bearing nearest to the motor.

a) New ball bearings and lip seals should be

installed if the old ones were removed. It is good
practice to replace both components whenever a
pump is disassembled. Both the inboard and
outboard ball bearings [3011, 3013] have a slight
interference fit on the drive shaft [2100.2].

b) In order to mount open bearings (oil bath and oil

mist lubricated) on the shaft, heat the bearings
uniformly to 93 °C (200 °F) with an induction
heater or clean oven.

Use insulating gloves while

handling hot bearings.

Figure 6-26: Flowserve Guardian G & H Series
power end bearings

Group Type of bearing

Oil bath/mist – open 1 6307-C3

1

2

1. These bearings are open on both sides. They are lubricated by
oil bath or oil mist.

2. These bearings are shielded on both sides. They come pre­greased by the bearing manufacturer. The user does not need
to regrease these bearings. The shields do not actually contact
the bearing race, so no heat is generated.

3. The codes shown are SKF codes. Inboard and outboard
bearings have the C3, greater than “normal” clearance. These
clearances are recommended by SKF to maximize bearing life.
All bearing configurations are supplied only with steel cages

Greased for life -

double shielded 2

Oil bath/mist – open 1 6310-C3

Greased for life -

double shielded 2

Inboard and outboard

single row, deep groove 3

6307-2ZC3

6310-2ZC3

c) Quickly slide the bearings onto the drive shaft

and position them firmly against the drive shaft
shoulder. The inboard and outboard bearings
are interchangeable. Let the bearings cool for at
least one hour before proceeding further.

An alternate installation procedure for the open
bearings is to follow the method described for sealed
and shielded bearings below:
a) Sealed or shielded bearings (i.e. greased for life)

should be mounted on the shaft by pressing on
the inner race until the bearings rest firmly
against the drive shaft shoulder.

b) When the bearings are pressed, even force

should be applied to the inner race only. Never
press the outer race, as the force will damage the
balls and races.

c) After the bearings have been mounted, check for

ease of rotation.

6.9.1.2 Power end assembly – long-coupled

Guardian G & H series pumps

a) Clean the interior surfaces of the bearing housing

and bearing cover using a non-flammable solvent
cleaner. Press the inboard lip seal [4310.1] into
the bearing housing [3132], and the outboard lip
seal [4310.2] into the bearing cover [3260]. Metal
shield on lip seal to face the outside environment.

b) Place the wavy washer [127A] in the bearing

housing. Slide the drive shaft [2100.2] and bearings
into the bearing housing [3200]. (Figure 45.)

The outboard bearing protrudes out of the
bearing housing until the bearing cover is in place.
When the bearing cover fasteners are tightened, the
wavy washer in the bearing bore will compress, thus
placing the bearings in their final position.

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c) Place a new bearing cover/bearing housing O-

ring [4610.2] in the bearing cover [3260] and
temporarily hold it in place with a small amount of
grease. Place the bearing cover [3260] onto the
bearing housing and secure it with the three (3)
bearing cover fasteners [6570.3]. Make sure the
bearing housing drain plug [6569.1] is in place in
the bearing housing.

d) Remove any material that has been attracted to

the outer magnet assembly. There are close
clearances between the rotating magnetic
assembly and adjacent stationary parts. For
reliability, it is important that foreign matter be
removed.

e) Attach the outer magnet flange [231] to the outer

magnet [230] using hex head cap screws
[6570.7]. Screw the outer magnet flange
assembly [230/231] onto the drive shaft [2100.2].
Mount the drive shaft/coupling key [6700] and a
Durco impeller wrench on the shaft. Using
gloves, grasp the magnet firmly and with the
wrench handle pointing to the left when viewed
from the magnet side of the bearing housing
[3200], spin the outer magnet and flange
assembly rapidly in a clockwise direction to
impact the impeller wrench handle on the work
surface to the right. After several sharp raps, the
outer magnet assembly should be tight.

The threads are right hand.

f) Insert the socket head cap screw [6570.8] into

the center of the outer magnet flange and tighten.
(The threads are right hand.)

g) The assembly of the power end is complete.

6.9.1.3 Labyrinth seals

The following are general installation instructions
regarding the VBXX Inpro seal. Follow the
instructions provided with the seal by the
manufacturer.

The elastomer O-ring located on the OD of the seal
has been sized to overfill the groove in which it is
located. When installing the seal into its
corresponding housing, in addition to compressing
the o-ring a certain amount of material may shear off.
This sheared material should be removed. An arbor
press should be used to install the seal.

Install the inboard seal in the bore of the bearing
housing with the single expulsion port positioned at
the 6 o’clock position.

Install the outboard seal in the bore of the bearing
cap with the single expulsion port positioned at the 6
o’clock position.

6.9.1.4 Magnetic seals

Follow the installation instructions provided by the
manufacturer.

6.9.1.5 Outer magnet/motor assembly – close­coupled Guardian

a) Attach the new motor gasket [4590.8] to the

motor flange [251].

b) Mount the motor flange [251] onto the motor and

secure it with the four (4) motor flange/motor
fasteners [6570.11]. (See Figure 6-27.)

Figure 6-27: Motor flange/motor assembly

c) Attach the hub [245] to the outer magnet

assembly [230/231] using the four (4) hub
fasteners. (See Figure 6-22.)

d) Place the key on the motor shaft and mount the

outer magnet assembly [230/231] to the motor
shaft by sliding the attached hub [245] over the
motor shaft. It is critical that the face of the motor
shaft contact the outer magnet flange [231]. This
ensures the proper axial location of the outer
magnet assembly. (See Figure 6-22.)

e) Tighten the set screw into the hub to secure the

outer magnet assembly [230/231] to the motor
shaft.

6.9.2 Wet end assembly

a) To place the inboard, (T-shaped) bushing [212] in

the bearing holder [3830] properly, use grease,
silicone or other process compatible lubricant to
temporarily hold the bushing in place. Put grease
on the back side of the thrust face (the flat face).
This is done to hold the bushing in place when the
pump shaft is inserted through the bushings. Align
the bushing with the bearing bore and insert it as
straight as possible. Make sure both pins rest in the
groove on the back face of the bushing. Avoid
cocking the bearings in order to prevent damage
during installation. If the bushings do not go in
easily, remove the bushing gently and try again. If
the bushing still does not slide in, check for any
burrs or nicks that may be present in the bearing
holder and remove them with sandpaper.

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b) Place the outboard, (T-shaped) bushing [216] in the

outboard end of the bearing holder temporarily
securing it in the same manner as the inboard
bushing.

Special instructions for installing Guardian H
series cartridge type bushings

In some instances Guardian H series cartridge type
bushings can be difficult to install into the bearing
holder due to the tight tolerance between cartridge
sleeve and the bearing holder bore. For these cases,
use the following procedure to install these bushings.

This procedure is only necessary for H
series Guardian pumps with cartridge-type bushings.
For G series Guardian pumps, skip to step i).
c) Heat bearing holder to approximately 71-93 °C

(160-200 °F) with a ball bearing induction heater
or in a clean oven.

Use caution when handling hot

parts. Wear insulated gloves.

d) While the bearing holder is still hot, place the

outboard cartridge bushing into the bearing holder,
seating it fully and engaging the slots of the bushing
with the tabs/pins of the bearing holder. The
bushing should drop freely into the bearing holder.

e) Repeat step d) above with the inboard cartridge

bushing.

f) With the two bushings installed in the bearing

holder, place the shaft/shaft journal assembly into
the outboard bushing, sliding it through the
inboard bushing until it just protrudes from the
other side of the inboard bushing. If the shaft will
not slide through into the inboard bushing,
proceed to step g). Otherwise, proceed to step i).

g) With the shaft inserted as far as it will go, use a

soft mallet to

very gently

tap around the side of
the keyed end of the shaft/journal from several
directions. (See figure 6-28.) This will help align
the bore of the outboard bushing with the
inboard, allowing the shaft/journal to drop into the
inboard bushing.

Figure 6-28: Guardian H series bushing alignment
technique

h) Rotate the shaft/journal several times to ensure it

spins freely. If it does not, continue to turn the
shaft/journal while

very gently

tapping on its side
as in step g). This should fully align the bushings
and the shaft.

i) Proceed to step j) to complete assembly of the

wet end of the pump.

j) Place the outboard thrust journal [217] into the

inner magnet assembly. Align the journal with
the locating pins and temporarily secure it in
place with lubricant.

Figure 6-29: Pump shaft with gasket

k) If the pump shaft/pump shaft journal assembly

has been disassembled, follow step k).
Otherwise, proceed to step n). Install the pump
shaft tolerance rings [241] onto the pump shaft.
Do so by first sliding them over the keyed end of
the shaft. Second, expand the tolerance ring in
order to slide it onto the shaft. This can be
accomplished by inserting a screwdriver inside
the ring and prying it open. JUST EXPAND THE
TOLERANCE RING. BE CAREFUL NOT TO
BEND THE TOLERANCE RING. After the
tolerance ring is on the shaft, slide it towards the
impeller end of the shaft until it seats into the
groove closest to the keyed end of the shaft (this
will aid in installing additional tolerance rings).
Perform the same procedure of expanding the
other tolerance ring(s) as the first and slide it
down the shaft. Slide it over the first tolerance
ring and continue until it seats in its respective
groove. (Figure 6-30 and 6-31.)

Figure 6-30: Group 1 pump shaft with mounted
tolerance rings

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Figure 6-31: Group 2 pump shaft with mounted
tolerance rings

Tolerance rings may have sharp

edges.

l) Install the pump shaft gasket [4590.6] into the flat

bottomed groove located on the flanged portion
of the pump shaft [2100.1]. Hold it in place with
lubricant. (Figure 6-40.)

m) Using an arbor press, press the pump shaft

journal [213] onto the pump shaft [2100.1] using
the following procedure. DO NOT PRESS ON
THE PUMP SHAFT JOURNAL. PRESS ONLY
ON THE PUMP SHAFT.

First, set the pump shaft journal on a flat surface
below the arbor.

Group 1.

The flat surface must have a hole
approximately 0.8-0.9 in. (20-23 mm) in diameter
that is at least 1.5 in. (38 mm) deep.

Group 2.

The flat surface must have a hole
approximately 1.4-1.5 in. (36-38 mm) in diameter
that is at least 1.5 in. (38 mm) deep.

Align the pump shaft journal [213] so that the
hole in the flat surface is in the center of the
pump shaft journal bore. Make sure the pump
shaft journal is supported and cannot cock during
the pressing operation.

Figure 6-32: Pump shaft/journal assembly

n) Place a new inner magnet/pump shaft gasket

[4590.6] into the groove on the inner magnet
assembly [220]. (Figure 6-33.).

Figure 6-33: Inner magnet/pump shaft gasket

Slide the pump shaft journal assembly
[213/2100.1] into the inner magnet assembly.
(Figure 6-34.) Insert the pump shaft key [6700.2]
into the key slot of the shaft.

Figure 6-34: Shaft/inner magnet

The flat surface must have a hole in it
to allow the shaft to pass completely through the
pump shaft journal during the pressing operation.
Otherwise, the shaft would bottom out on the
work surface before it is completely pressed
through the pump shaft journal.

An alternate method of pressing the
pump shaft into the pump shaft journal is to use a
bench vise. Make sure the pump shaft and pump
shaft journal are not cocked relative to each other
during the pressing operation.

Second, insert the keyed end of the shaft into the
pump shaft journal. Press the pump shaft through
the journal until the pump shaft gasket butts up
against the pump shaft journal. Make sure the arbor
pressing face is relatively flat so as not to cock the
shaft in the pump shaft journal. (Figure 6-32.)

Page 50 of 68

Place a new cap/inner magnet O-ring [4610.6] in
the O-ring groove in the pump shaft cap [222].
Thread the cap onto the end of the pump shaft to
secure the pump shaft to the inner magnet
assembly. (Figure 6-35.)

Newer Guardian pumps use shaft caps
[222] that have a LEFT HAND thread (i.e. tighten
counter-clockwise). These are indicated by an
“LH” stamped into the end of the cap. Older
pumps that do not have the “LH” marking utilize
right hand threads. All future replacement
shafts/caps will have left hand threads.

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 6-35: Shaft cap

Group 1.

To tighten the pump shaft cap, place
one wrench on the flats on the back of the inner
magnet and use a torque wrench on the pump
shaft cap.

Group 2 (JG/JH-MG/MH couplings).

To tighten
the pump shaft cap, place one wrench on the
flats on the back of the inner magnet and use a
torque wrench on the pump shaft cap.

Group 2 (NG/NH-QG/QH couplings).

To tighten
the pump shaft cap, place an adjustable spanner
wrench in the two 5 mm (3/16 in.) diameter holes
on the back of the magnet and use a torque
wrench on the pump shaft cap.

o) Slide the pump shaft/inner magnet assembly

through the bushings CAREFULLY and
SLOWLY. (Figure 6-36.)

Figure 6-36 Inner magnet/shaft assembly
installation

Figure 6-37: Group 1 thrust collar with shims

Figure 6-38: Group 2 Thrust Ring with Shims

Make sure the shims sit flat

against the flat surface in the collar ring for Group

2. If they do not sit flat, the impeller may deform
them during the next assembly step.

Figure 6-39 Group 2 Thrust collar/ring

Group 1.

Temporarily place shims [3126.2] on
the impeller side of the thrust collar [3610].
(Figure 6-37.) Shims are used to adjust the
impeller clearance. Adjustment will be completed
in Section 6.9.4.

Group 2.

On Group 2 pumps, the shims are
sandwiched between the thrust collar [3610] and
thrust collar ring [207]. Place the shims into the
counterbore on the thrust collar ring [207] and hold
them in place with lubricant. (Figure 6-38.) Place
the assembly into the thrust collar. (Figure 6-39.)

Page 51 of 68

p) Install the inboard thrust journal [211] into the

thrust collar [3610] (using an appropriate
lubricant to hold it in place). (Figure 6-40.) Place
the thrust collar into the bearing holder [3830] so
the thrust journal sits flat on the grooved portion
of the T-shaped bushing [212]. (Figure 6-41.)

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Figure 6-40: Thrust collar

Figure 6-41: Thrust collar

q) Thread the impeller on HAND TIGHT ONLY to

secure the pump shaft and inner magnet
assembly to the bearing holder. (Figure 6-42.)
Do not install impeller gasket [4590.2] and O-ring
[4610.5 and 4610.4] at this time.

Group 1.

Make sure that the shims seat flat
between the impeller and the thrust collar when
threading the impeller onto the shaft. If the
impeller rubs the face of the bearing holder
[3830], add more shims in the thrust collar.

Close-coupled pumps ONLY.

After reassembly
of the impeller to the pump shaft, the impeller
fastener [2913] and O-ring [4610.8] must be
threaded through the center of the impeller [2200]
into the pump shaft [2100.1]. The impeller
fastener torque should be 34 Nm (25 ft•lbs).

Figure 6-42: Impeller/bearing holder

s) Install adapter [1340] to bearing holder [3830].

Orientation of the adapter to the bearing
holder is vital for the proper operation of the pump
(venting and draining of the containment area).
Therefore, these parts have been pinned to ensure
the proper radial location. (Figure 6-43.)

Figure 6-43: Adapter/bearing holder pin

t)

Group 1.

Stretch bearing holder/retainer O-ring
[4610.7] over holder and place in outer notch of
holder.

Group 2.

Place the bearing housing/adapter
O-ring [4610.1] and bearing holder/adapter
O-ring [4610.7] into the O-ring grooves on the
inner diameter of the adapter.

u) Put the bearing holder/containment shell O-ring

[4610.3] into the groove on bearing holder [3830].
Making sure the O-ring sits properly in the groove,
place containment shell [224] and retaining ring
[228] onto the assembly. (Figure 6-44.)

v) Secure the assembly with six (6) retainer ring/

bearing holder fasteners [6570.6]. Tighten the bolts
in a diagonally alternating pattern. (Figure 6-44.)

w)

Group 1.

Stretch retainer ring/adapter O-ring
[4610.1] over the outer diameter of the retainer
ring [228].

Figure 6-44: Containment shell with retaining ring

r) Place the entire wet end assembly vertically on the

workbench with the impeller down and supporting
the weight of the assembly. Adjust the impeller
clearance as described in Section 6.9.4.

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6.9.3 Mounting the wet end to the power end

6.9.3.1 Long-coupled Guardian G & H series
pumps

Keep your fingers away from the pinch point
where the bearing housing and adapter meet as the
jackbolts are threaded. The magnetic forces draw
the power end and wet end together with great force.
a) This step must be performed with the wet end

assembly and bearing housing in the horizontal
position. Thread the square head jackbolts [6575]
completely through the threaded holes in the bearing
housing [3200]. (The entire length of the bolts must
be threaded through the holes.) Slide the wet end
assembly into the bearing housing until the jackbolts
slide into the recesses in the adapter [1340].

b) Turn the jackbolts [6575] counterclockwise to

allow the wet end of the pump to slide into the
power end. Turn the bolts one to two turns in a
diagonally alternating pattern to prevent binding.
This procedure ensures that the wet end is
inserted evenly without damaging the magnets or
the containment shell. (Figure 6-45.)

Figure 6-45: Power End/Wet End Assembly

c) Back out the jackbolts until the adapter butts up to

the bearing housing [3200]. Make sure that the
adapter [1340] and the bearing housing sit flat
against one another. Insert the four (4) bearing
housing/adapter fasteners [6570.5] and tighten them
in an alternating pattern. Make sure the jackbolts do
not interfere with the tightening of these bolts.

6.9.3.2 Close-coupled Guardian G & H series

pumps – lantern assembly to the wet
end

a) Make sure the lantern/retainer o-ring [4610.1] is

in place in the wet end.

b) Orient the wet end vertically on the work surface.

(Figure 6-46.) Align the lantern [3132] such that
the roll pin in the adapter [1340] is aligned with
the mating hole in the lantern [3132]. Place the
lantern into adapter making sure the lantern
seats flat on the adapter. Insert the four (4)
lantern/adapter fasteners [6570.5] and tighten in
an alternating pattern.

c) The wet end assembly can now be assembled to

the outer magnet/motor assembly.

Figure 6-46: Lantern assembly to wet end

6.9.3.3 Close-coupled Guardian G & H series
pumps – drive end to the wet end
assembly

Keep your fingers away from the pinch point
where the lantern [3132] and motor flange [251] meet
as the jackscrews are threaded. Magnetic forces draw
the drive end and wet end together with great force.
a) This step must be performed with the wet end

assembly and motor assembly in the horizontal
position. Thread the square head jackscrews
[6575] completely through the threaded holes in
the lantern [3132]. The entire length of the
jackscrews must be threaded through the holes.

b) Install a lantern gasket [4590.7] on the face of the

motor flange [251].

c) Slide the motor assembly toward the wet end

assembly until the jackscrews slide into the
recess in the motor flange. (See Figure 6-47.)

Figure 6-47: Motor/pump assembly

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d) Turn the jackscrews [6575] counterclockwise to

allow the outer magnet/motor assembly to slide
over the containment shell [224]. Turn the
screws one to two turns in an alternating pattern
to prevent binding.

e) Back out jackscrews until the lantern [3132] butts

up to the motor flange [251]. Make sure that the
lantern and motor flange sit flat against one
another. Insert the four (4) motor flange/lantern
fasteners [6570.10] and tighten them in an
alternating pattern. Make sure the jackscrews
[6575] do not interfere with the tightening of these
bolts.

6.9.4 Adjusting the Impeller

a) Temporarily tighten the impeller [2200] to the

pump shaft [2100.1]. Turn the impeller in a
clockwise direction until the impeller is firmly
seated but only hand tight.

Do not attempt to tighten the
impeller on the shaft by hitting the impeller with a
hammer or by inserting a pry bar between the
impeller vanes. Serious damage to the impeller
may result from these actions.

b) Place the entire assembly vertically on the

workbench with the impeller down and supporting
the weight of the assembly. Measure the minimum
clearance between the bearing holder face [3830]
and the impeller [2200] with a feeler gauge without
forcing the impeller away from the face. Measure
the clearance between the bearing holder and ALL
THE VANES to determine closest vane. Use the
smallest measurement as your guide and record
this number.

c) The Guardian Magnetic Drive requires a

clearance of 0.45 mm (0.018 in.) ± 0.08 mm
(0.003 in.), regardless of operating temperature,
between the closest impeller vane and the face of
the bearing holder. Determine the number of
shims that must be placed between the impeller
and the thrust collar by subtracting the minimum
clearance between the bearing holder and the
impeller from the thickness of the impeller shims
already inserted. Add 0.45 mm (0.018 in.) to this
difference. This number is the thickness of shims
that are required to adjust the impeller.

For example,

the closest impeller vane and the bearing holder
face is 0.75 mm (0.030 in.), and the thickness of
the shims already inserted is 1.00 mm (0.040 in.),
subtract

0.75 mm (0.030 in.) from 1.00 mm (0.040 in.).

1.00 mm – 0.75 mm = 0.25 mm
(0.040 in. – 0.030 in. = 0.010 in.)

if the initial measurement between

Next, add 0.45 mm (0.018 in.) to 0.25 mm
(0.010 in.) to determine the thickness of the
shims required to adjust the impeller properly.

0.25 mm + 0.45 mm = 0.70 mm
(0.010 in. + 0.018 in. = 0.028 in.)

A combination of shims equal to 0.70 mm
(0.028 in.) thickness would then be required to
set the impeller properly.

d) Set the assembly back to horizontal. Remove

the impeller and the 1.00 mm (0.040 in.)
combination of shims from the pump shaft.
Removal should only require using your hands
since the impeller was only hand tightened. If
necessary, use the Durco impeller wrench to hold
the shaft stationary.

e) Place the required number of shims against the

shoulder in the thrust collar [3610] or thrust collar
ring [207]. Thread the impeller back onto the pump
shaft and tighten as described in step a). Make sure
the shims sit flat between mating faces.

f) Recheck the impeller clearance as described in

step b). If the distance is more or less than
required, repeat steps c) thru f) until clearance is
correct.

g) When the clearance is properly set, set the

assembly back to horizontal. Remove the
impeller and thrust collar [3610].

Group 1.

O-ring [4610.4] in the groove on the back side of
the thrust collar. Stretch the thrust collar ring/
O-ring [4610.5] over the hub on the backside of
the impeller.

Group 2.

shims from the thrust collar. Place the thrust
collar/ring O-ring [4610.5] into the O-ring groove
on the shimming side of the thrust collar. Using
an arbor press, press the thrust collar ring and
shims into the thrust collar. In order to keep the
shims from falling out of the thrust collar during
this press, the ring should be placed on the work
surface with the thrust collar on top of it. Place
the thrust collar/pump shaft O-ring [4610.4] into
the groove on the pump shaft side of the thrust
collar. Place the thrust collar into the bearing
holder [3830] so the thrust journal sits flat on the
grooved portion of the T-shaped bushing [212].

h) Install new impeller gasket [4590.2] and tighten

the impeller until it is firmly seated.

sufficiently may allow liquid to reach the impeller
thread. Additionally, a loose impeller will be
tightened when the pump is started, but may be
very difficult to remove later.

Place the thrust collar/pump shaft

Remove the thrust collar ring and

Failure to tighten the impeller

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The impeller will be difficult to turn
because there is deformation of the O-rings
during seating of the impeller.

6.9.5 Mounting the drive assembly to the
casing

a) Before mounting the drive assembly to the pump

casing, drive the studs [6572] into the appropriate
tapped holes. Place a new bearing holder/casing
gasket [4590.1] on the gasket face of the bearing
holder.

b) Move the drive assembly into position in front of

the casing. Slide the drive assembly into the

casing and thread the eight (8) casing fastener
nuts [6580] onto the casing/adapter fasteners
[6572]. Torque these bolts in an alternating
pattern.

c) If the pump flange(s) have tapped holes, select

flange fasteners with thread engagement at least
equal to the fastener diameter but that do not
bottom out in the tapped holes before the joint is
tight.

d) Secure the bearing housing foot with appropriate

fastener(s).

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Insufficient NPSH. (Noise may not be

casing which may be due to a product

Wet end parts (casing cover, impeller)

7 FAULTS; CAUSES AND REMEDIES

The following is a guide to troubleshooting problems with Flowserve Guardian G & H series pumps. Common
problems are analyzed and solutions offered. Obviously, it is impossible to cover every possible scenario. If a
problem exists that is not covered by one of the examples then refer to one of the books listed in section 10,

Additional sources of information

assistance.

FAULT SYMPTOM

Pump not reaching design flow rate

Pump not reaching design head (TDH)

⇓⇓⇓⇓

⇓⇓⇓⇓

No discharge or flow with pump running

⇓⇓⇓⇓

⇓⇓⇓⇓

 

  

 

 
 

  

 

 

  

 



Pump operates for short period, then loses prime

⇓⇓⇓⇓

⇓⇓⇓⇓

Excessive noise from wet end

⇓⇓⇓⇓

⇓⇓⇓⇓

Excessive noise from power end

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump exhibits increased or higher than anticipated power consumption

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump exhibits decreased or lower than anticipated power consumption

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓



 











 



 









































or contact a Flowserve sales engineer or distributor/representative for

POSSIBLE CAUSES POSSIBLE REMEDIES

Recalculate NPSH available. It must be greater than the NPSH

present.)

System head greater than anticipated.

Entrained air. Air leak from
atmosphere on suction side.

Entrained gas from process.
Speed too low.

Direction of rotation wrong.

Impeller too small.
Impeller clearance too large.

Plugged impeller, suction line or
or large solids.

worn, corroded or missing.
Not properly primed.

Impeller rubbing.
Damaged bushings, pump shaft,

thrust journals, or impeller.
Abnormal fluid rotation due to

complex suction piping.

Magnetic coupling decoupled due to
excessive temperature or excessive
horsepower requirements.

Inner magnet rubbing bearing holder. Check for damaged or worn pump shaft and bushings.

required by pump at desired flow. If not, redesign suction piping,
holding number of elbows and number of planes to a minimum to
avoid adverse flow rotation as it approaches the impeller.

Reduce system head by increasing pipe size and/or reducing
number of fittings. Increase impeller diameter. (note: Increasing
impeller diameter may require use of a larger motor.)

1. Check suction line gaskets and threads for tightness.

2. If vortex formation is observed in suction tank, install vortex
breaker.

3. Check for minimum submergence

Process generated gases may require larger pumps.
Check motor speed against design speed.
After confirming wrong rotation, reverse any two of three leads on

a three phase motor. The pump should be disassembled and
inspected before it is restarted.

Replace with proper diameter impeller. (NOTE: Increasing
impeller diameter may require use of a larger motor.)

Reset impeller clearance.

1. Reduce length of fiber when possible.

2. Reduce solids in the process fluid when possible.

3. Consider larger pump.
Replace part or parts.
Repeat priming operation, recheck instructions. If pump has run

dry, disassemble and inspect the pump before operation.

1. Check and reset impeller clearance.

2. Check outboard bearing assembly for axial end play.
Replace damaged parts.
Redesign suction piping, holding the number of elbows and planes

to a minimum to avoid adverse fluid rotation as it approaches the
impeller.

1. Check process temperature to verify it’s within operating limits

of pump.

2. Check horsepower required by the process to verify it is within

the operating limits of the coupling size.

3. Replacement of the magnet assemblies may be necessary if

the magnets overheated and were permanently damaged. A static
torque test of the magnetic coupling may be necessary. Contact
your Flowserve representative for details.

Page 56 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

again by either axial or circumferential

Pump not reaching design flow rate

Pump not reaching design head (TDH)

⇓⇓⇓⇓

⇓⇓⇓⇓

No discharge or flow with pump running

⇓⇓⇓⇓

⇓⇓⇓⇓





Pump operates for short period, then loses prime

⇓⇓⇓⇓

⇓⇓⇓⇓

Excessive noise from wet end

⇓⇓⇓⇓

⇓⇓⇓⇓

Excessive noise from power end

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump exhibits increased or higher than anticipated power consumption

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump exhibits decreased or lower than anticipated power consumption

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

 

 

 

 



 

 

 



1. Abnormal bearing temperature

POSSIBLE CAUSES POSSIBLE REMEDIES

1. Work with clean tools in clean surroundings.

2. Remove all outside dirt from housing before exposing bearings.

Bearing contamination appearing on
the raceways as scoring, pitting,
scratching or rusting caused by
adverse environment and entrance of
abrasive contaminants from
atmosphere.

Brinelling of bearing identified by
indentation on the ball races, usually
caused by incorrectly applied forces
in assembling the bearing or by shock
loading such as hitting the bearing or
drive shaft with a hammer.

False brinelling of bearing identified
indentations usually caused by

vibration of the balls between the
races in a stationary bearing.

Thrust overload on bearing identified
by flaking ball path on one side of the
outer race or in the case of maximum
capacity bearings, may appear as a
spalling of the races in the vicinity of
the loading slot. (Please note:
maximum capacity bearings are not
recommended in Mark 2I pumps.)
These thrust failures are caused by
improper mounting of the bearing or
excessive thrust loads.
Misalignment identified by fracture of
ball retainer or a wide ball path on the
inner race and a narrower cocked ball
path on the outer race. Misalignment
is caused by poor mounting practices
or defective drive shaft. For example,
bearing not square with the centerline
or possibly a bent shaft due to
improper handling.

Bearing damaged by electric arcing
identified as electro- etching of both
inner and outer ring as a pitting or
cratering. Electrical arcing is caused
by a static electrical charge
emanating from belt drives, electrical
leakage or short circuiting.

Bearing damage due to improper
lubrication, identified by one or more
of the following:

3. Handle with clean dry hands.

4. Treat a used bearing as carefully as a new one.

5. Use clean solvent and flushing oil.

6. Protect disassembled bearing from dirt and moisture.

7. Keep bearings wrapped in paper or clean cloth while not in use.

8. Clean inside of housing before replacing bearings.

9. Check oil seals and replace as required.

10. Check all plugs and tapped openings to make sure that they
are tight.

When mounting the bearing on the drive shaft use a proper size
ring and apply the pressure against the inner ring only. Be sure
when mounting a bearing to apply the mounting pressure slowly
and evenly.

1. Correct the source of vibration.

2. Where bearings are oil lubricated and employed in units that

may be out of service for extended periods, the drive shaft should
be turned over periodically to relubricate all bearing surfaces at
intervals of one to three months.

Follow correct mounting procedures for bearings.

Handle parts carefully and follow recommended mounting
procedures. Check all parts for proper fit and alignment.

1. Where current shunting through the bearing cannot be

corrected, a shunt in the form of a slip ring assembly should be
incorporated.

2. Check all wiring, insulation and rotor windings to be sure that

they are sound and all connections are properly made.

3. Where pumps are belt driven, consider the elimination of static

charges by proper grounding or consider belt material that is less
generative.

1. Be sure the lubricant is clean.

2. Be sure proper amount of lubricant is used. The constant level

oiler supplied with Durco pumps will maintain the proper oil level if
it is installed and operating properly. In the case of greased

Page 57 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Pump not reaching design flow rate

Pump not reaching design head (TDH)

⇓⇓⇓⇓

⇓⇓⇓⇓

No discharge or flow with pump running

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump operates for short period, then loses prime

⇓⇓⇓⇓

⇓⇓⇓⇓

Excessive noise from wet end

⇓⇓⇓⇓

⇓⇓⇓⇓

Excessive noise from power end

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump exhibits increased or higher than anticipated power consumption

⇓⇓⇓⇓

⇓⇓⇓⇓

Pump exhibits decreased or lower than anticipated power consumption

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

⇓⇓⇓⇓

rise.

2. A stiff cracked grease appearance.

3. A brown or bluish discoloration of
the bearing races.

 

POSSIBLE CAUSES POSSIBLE REMEDIES

Outer magnet assembly rubbing
bearing housing.

lubricated bearings, be sure that there is space adjacent to the
bearing into which it can rid itself of excessive lubricant, otherwise
the bearing may overheat and fail prematurely.

3. Be sure the proper grade of lubricant is used.

1. Check integrity of ball bearings.

2. Make sure drive shaft is not bent.

3. Make sure outer magnet assembly has not come unscrewed

due to incorrect motor rotation.

Page 58 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

8 PARTS LIST AND DRAWINGS

8.1 Cutaway – Guardian G & H Series – Group 1 – long coupled

216

2200

3610

4590.6

1100

4610.5

4610.4

4590.2

2100.1

213

3126.2

212

211

3830

6570.6

4610.7

241

4590.6

230A

6570.9

220

230

224

4610.3

4590.1

228

1340

4610.1

6570.1

6580.1

240

6570.5

6575

217

6700.24610.6
2923

6570.7

222231

3134

6570.4

6521

3126.1

4310.1

3260

4610.9

6570.8

4310.2

6700

2100.2

3011

3013

6570.3

4260

6569.4

3855

3856

6569.5

3132

Page 59 of 68

flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

8.1.1 Parts list – Guardian G & H Series – Group 1 – long coupled

Description

O-ring

O-ring

O-ring

O-ring

O-ring

Vent Plug

Plug

Plug

Screw

Screw

Screw

Screw

Screw

Screw

Qty

1

1

1

1

1

1

1

1

3

1

4

6

4

1

Item

4610.4

4610.5

4610.6

4610.7

4610.9

6521

6569.1

6569.5

6570.3

6570.4

6570.5

6570.6

6570.7

6570.8

Screw

Stud

Jackscrew

Nut

Key

Key

4

8

4

8

1

1

6570.9

6572.1

6575

6580.1

6700.1

6700.2

Description

Pin

Ball Bearing

Ball Bearing

Shim

Shim

Support Foot

Bearing Housing

Bearing Cover

Thrust Collar

Holder

Constant Level Oiler

Sight Oil Gauge

Spring

Lip Seal

Lip Seal

Gasket

Gasket

Gasket

O-ring

O-ring

Qty

8

1

1

n/a

n/a

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

Item

2923

3011

3013

3126.1

3126.2

3134

3200

3260

3610

3830

3855

3856

4260

4310.1

4310.2

4590.1

4590.2

4590.6

4610.1

4610.3

Parts list – Guardian G & H Series – Group 1 – long coupled

Description

Tag – Oil Level

Journal – Inboard

Bushing – Inboard

Journal – Sleeve

Bushing – Outboard

Journal – Outboard

Magnet Assy – Inner

Cap – Pump Shaft

Containment Shell

Retainer Ring

Magnet Assy – Outer

Rub Pad

Flange – Outer Magnet

Support – Housing

Tolerance Ring

Casing

Adapter

Shaft

Shaft

Impeller

Qty

1

1

1

1

1

1

1

1

1

1

1

4

1

1

2

1

1

1

1

1

Item

200B

211

212

213

216

217

220

222

224

228

230

230A

231

240

241

1100

1340

2100.1

2100.2

2200

Page 60 of 68

flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

8.2 Cutaway - Guardian G & H Series - Group 2 – long coupled

4610.5

Page 61 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

8.2.1 Parts list - Guardian G & H Series - Group 2 – long coupled

Description

O-ring

O-ring

O-ring

O-ring

O-ring

O-ring

Vent Plug

Plug

Plug

Screw

Screw

Screw

Screw

Qty

1

1

1

1

1

1

1

1

1

3

1

4

6

Item

4610.3

4610.4

4610.5

4610.6

4610.7

4610.9

6521

6569.1

6569.5

6570.3

6570.4

6570.5

6570.6

Screw

Screw

Screw

Stud

Jackscrew

Nut

Key

Key

6

1

8

8

4

8

1

1

6570.7

6570.8

6570.9

6572.1

6575

6580.1

6700.1

6700.2

Description

Impeller

Pin

Ball Bearing

Ball Bearing

Shim

Shim

Support Foot

Bearing Housing

Bearing Cover

Thrust Collar

Holder

Constant Level Oiler

Sight Oil Gauge

Spring

Lip Seal

Lip Seal

Gasket

Gasket

Gasket

O-ring

Qty

1

8

1

1

n/a

n/a

1

1

1

1

1

1

1

1

1

1

1

1

2

1

Item

2200

2923

3011

3013

3126.1

3126.2

3134

3200

3260

3610

3830

3855

3856

4260

4310.1

4310.2

4590.1

4590.2

4590.6

4610.1

Parts list - Guardian G & H Series - Group 2 – long coupled

Description

Tag – Oil Level

Ring – Thrust Collar

Journal - Inboard

Bushing - Inboard

Journal - Sleeve

Bushing - Outboard

Journal - Outboard

Magnet Assy - Inner

Cap – Pump Shaft

Containment Shell

Retainer Ring

Magnet Assy - Outer

Rub Pad

Flange – Outer Magnet

Support - Housing

Tolerance Ring

Casing

Adapter

Shaft

Shaft

Qty

1

1

1

1

1

1

1

1

1

1

1

1

8

1

1

4

1

1

1

1

Item

200B

207

211

212

213

216

217

220

222

224

228

230

230A

231

240

241

1100

1340

2100.1

2100.2

Page 62 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

8.3 Cutaway - Guardian G & H Series - Group 1 – close coupled

4610.4

211

241

3830

4610.3

6570.6

1340

6570.9

230A

3610

4610.5

3126.2

103B

2100.1

103A

1100

2200

4590.2
213

212

4590.1

4610.7

228

4610.1

6570.5216

4590.6

230

220

251

4590.8

4610.6

6570.8

222

224

231

6700.2

217

292331326570.74590.7

6575

Page 63 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

8.3.1 Parts list - Guardian G & H Series - Group 1 – close coupled

Description

O-ring

O-ring

O-ring

O-ring

O-ring

Screw

Screw

Screw

Screw

Screw

Screw

Stud

Qty

1

1

1

1

1

4

6

4

4

4

4

8

Item

4610.4

4610.5

4610.6

4610.7

4610.8

6570.5

6570.6

6570.7

6570.9

6570.10

6570.11

6572.1

Jackscrew

Nut

Key

4

8

1

6575

6580.1

6700.1

Description

Adapter

Shaft

Impeller

Impeller Screw

Pin

Shim

Bearing Bracket Lantern

Thrust Collar

Holder

Gasket

Gasket

Gasket

Gasket

Gasket

O-ring

O-ring

Qty

1

1

1

1

8

n/a

1

1

1

1

1

2

1

1

1

1

Item

1340

2100.1

2200

2913

2923

3126.2

3132

3610

3830

4590.1

4590.2

4590.6

4590.7

4590.8

4610.1

4610.3

Parts list - Guardian G & H Series - Group 1 – close coupled

Description

Journal - Inboard

Bushing - Inboard

Journal - Sleeve

Bushing - Outboard

Journal - Outboard

Magnet Assy - Inner

Cap – Pump Shaft

Containment Shell

Retainer Ring

Magnet Assy - Outer

Rub Pad

Flange – Outer Magnet

Tolerance Ring

Hub and Hardware

Motor Flange

Casing

Qty

1

1

1

1

1

1

1

1

1

1

4

1

2

1

1

1

1

Item

211

212

213

216

217

220

222

224

228

230

230A

4

231

2

245

251

1100

Page 64 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

9 CERTIFICATION

Certificates, determined from the contract
requirements are provided with these instructions
where applicable. Examples are certificates for CE
marking and ATEX marking etc. If required, copies of
other certificates sent separately to the Purchaser
should be obtained from Purchaser for retention with
these User Instructions.

10 OTHER RELEVANT

DOCUMENTATION AND MANUALS

10.1 Supplementary User Instructions

Supplementary instructions such as for a driver,
instrumentation, controller, seals, sealant systems etc
are provided as separate documents in their original
format. If further copies of these are required they
should be obtained from the supplier for retention
with these User Instructions.

10.2 Change notes

If any changes, agreed with Flowserve Pump
Division, are made to the product after it is supplied,
a record of the details should be maintained with
these User Instructions.

10.3 Additional sources of information

The following are excellent sources for additional
information on Flowserve Mark 3 pumps, and
centrifugal pumps in general.

Pump Engineering Manual

R.E. Syska, J.R. Birk,
Flowserve Corporation, Dayton, Ohio, 1980.

Specification for Horizontal End Suction Centrifugal
Pumps for Chemical Process, ASME B73.1M

The American Society of Mechanical Engineers,
New York, NY.

Specification for Sealless Horizontal End Suction
Metallic Centrifugal Pumps for Chemical Process,
ASME B73.3

The American Society of Mechanical Engineers,
New York, NY.

American National Standard for Centrifugal Pumps
for Nomenclature, Definitions, Design and Application
(ANSI/HI 1.1-1.3)

Hydraulic Institute, 9 Sylvan Way, Parsippany,
New Jersey 07054-3802.

American National Standard for Centrifugal Pumps for
Installation, Operation, and Maintenance (ANSI/HI 1.4)

Hydraulic Institute, 9 Sylvan Way, Parsippany,
New Jersey 07054-3802.

Flowserve Durco Pump Parts Catalog.
Flowserve Guardian Sales Bulletin.
Flowserve Sealless Process Pump Technical Bulletin

(P-20-501).
RESP73H Application of ASME B73.1M-1991,

Specification for Horizontal End Suction Centrifugal
Pumps for Chemical Process, Process Industries
Practices

Construction Industry Institute, The University of
Texas at Austin, 3208 Red River Street, Suite 300,
Austin, Texas 78705.

Pump Handbook

2nd edition, Igor J. Karassik et al, McGraw-Hill, Inc.,
New York, NY, 1986.

Centrifugal Pump Sourcebook

John W. Dufour and William E. Nelson,
McGraw-Hill, Inc., New York, NY, 1993.

Pumping Manual, 9th edition

T.C. Dickenson, Elsevier Advanced Technology,
Kidlington, United Kingdom, 1995.

Page 65 of 68

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GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

NOTES:

Page 66 of 68

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NOTES:

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Page 67 of 68

flowserve.com

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11

Your Flowserve factory contact:

Flowserve Pump Division
3900 Cook Boulevard
Chesapeake, VA 23323-1626 USA
Telephone [phone]
Fax [phone]

Flowserve GB Limited
PO Box 17, Newark, Notts NG24 3EN
United Kingdom

Telephone (24 hours) [phone]
Sales & Admin Fax [phone]
Repair & Service Fax [phone]
E-mail [e-mail]

Your local Flowserve representative:

To find your local Flowserve representative please
use the Sales Support Locator System found at
www.flowserve.com

FLOWSERVE REGIONAL
SALES OFFICES:

USA and Canada

Flowserve Corporation
5215 North O’Connor Blvd.,
Suite 2300
Irving, Texas 75039-5421, USA
Telephone [phone]
Fax [phone]

Europe, Middle East, Africa

Flowserve FSG – Italy
Worthing S.r.l.
Via Rossini 90/92
20033 Desio (Milan), Italy
Telephone [phone]
Fax [phone]

Latin America and Caribbean

Flowserve Corporation
6840 Wynnwood Lane
Houston, Texas 77008, USA
Telephone [phone]
Fax [phone]

Asia Pacific

Flowserve Pte. Ltd
10 Tuas Loop
Singapore 637345
Telephone [phone]
Fax [phone]