Flowserve PVML User Manual

®

Pump Division

Type: PVML
CENTRIFUGAL PUMPS

USER INSTRUCTIONS:
INSTALLATION, OPERATION, MAINTENANCE

PCN=00079591, ed. 01-05 (E)

These instructions should be read prior to installing,

operating, using and maintaining this equipment.

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

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........................7

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............................................................9

2.5 Recycling and end of product life.................... 9

3 PUMP DESCRIPTION......................................... 10

3.1 Configurations...............................................10

3.2 Name nomenclature......................................10

3.3 Design of major parts....................................10

3.4 Performance and operating limits.................10

4 INSTALLATION.................................................... 11

4.1 Location.........................................................11

4.2 Part assemblies.............................................11

4.3 Foundation....................................................11

4.4 Grouting ........................................................11

4.5 Initial alignment.............................................13

4.6 Piping............................................................13

4.7 Electrical connections ...................................14

4.8 Final shaft alignment check ..........................15

4.9 Protection systems........................................15

5 COMMISSIONING, START-UP, OPERATION AND

SHUTDOWN.......................................................15

5.1 Pre-commissioning procedure......................15

5.2 Pump lubricants ............................................15

5.3 Impeller clearance......................................... 15

5.4 Direction of rotation.......................................15

5.5 Guarding .......................................................15

5.6 Priming and auxiliary supplies ......................15

5.7 Starting the pump..........................................16

5.8 Running the pump.........................................16

5.9 Stopping and shutdown.................................17

5.10 Hydraulic, mechanical and electrical duty...17

6 MAINTENANCE...................................................18

6.0 General .........................................................18

6.1 Maintenance schedule..................................18

6.2 Spare parts....................................................19

6.3 Recommended spares

and consumable items ..................................19

6.4 Tools required................................................19

6.5 Fastener torques...........................................20

6.6 Setting impeller clearances...........................20

6.7 Disassembly..................................................20

6.8 Examination of parts .....................................21

6.9 Assembly.......................................................22

PAGE

7 FAULTS; CAUSES AND REMEDIES.................. 25

8 PARTS LIST AND DRAWINGS........................... 27

8.1 Sectional drawings -PVML ........................... 27

8.2 Parts list -PVML............................................ 27

8.3 General arrangement drawing...................... 28

9 CERTIFICATION................................................. 28

10 OTHER RELEVANT DOCUMENTATION AND

MANUALS.......................................................... 28

10.1 Supplementary User Instructions ............... 28

10.2 Change notes ............................................. 28

10.3 Additional sources of information................ 28

ALPHABETICAL INDEX

PAGE

CE marking and approvals (1.2) ............................... 3

Clearances (see 6.7, Renewal clearances) ............ 20

Commissioning and operation (see 5) .................... 15

Configurations (3.1)................................................. 10

Direction of rotation (5.4)......................................... 15

Dismantling (see 6.7, Disassembly)........................ 20

Duty conditions (1.5) ................................................. 3

Electrical connections (4.7)..................................... 14

Examination of parts (6.8)....................................... 21

Faults; causes and remedies (7.0).......................... 25

General assembly drawings (see 8)........................ 28

Grouting (4.4).......................................................... 12

Guarding (5.5)......................................................... 15

Handling (2.2)............................................................ 9

Hydraulic, mechanical and electrical duty (5.10) .... 17

Lifting (2.3) ................................................................ 9

Location (4.1) .......................................................... 11

Lubrication schedule (see 5.2, Pump lubricants).... 15

Maintenance schedule (6.1).................................... 18

Piping (4.6).............................................................. 13

Priming and auxiliary supplies (5.6)........................ 15

Reassembly (see 6.9, Assembly)............................ 22

Replacement parts (see 6.2 and 6.3)...................... 19

Safety, protection systems (see 1.6 and 4.9)

Sound level (see 1.9, Noise level)............................. 8

Specific machine performance (1.8) ......................... 8

Starting the pump (5.7)............................................ 16

Stopping and shutdown (5.9).................................. 17

Storage (2.4) ............................................................. 9

Supplementary manuals or information sources..... 28

Tools required (6.4)................................................. 19

Torques for fasteners (6.5)...................................... 20

Page 2 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

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's 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 and regulations.

These instructions should be 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.

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 reliable. In spite of all the efforts of
Flowserve Pump Division to provide sound and
all necessary information the content of this
manual may appear insufficient and is not
guaranteed by Flowserve as to its completeness
or accuracy.

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 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.

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
seeks Flowserve’s written agreement before start up.

Page 3 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

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 instruct ions 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 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 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.

NEVER DO MAINTENANCE WORK

WHEN THE UNIT IS CONNECTED TO POWER

GUARDS MUST NOT BE REMOVED WHILE

THE PUMP IS OPERATIONAL

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

FLUORO-ELASTOMERS (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.

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 b e
avoided.

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

HOT (and cold) PARTS
If hot or freezing components or auxiliary heating
supplies can present a danger to operators and
persons entering the immediate area action must be
taken to avoid accidental contact. 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. Note: bearing housings must not be
insulated and drive motors and bearings may be hot.

If the temperature is greater than 68 °C (175 °F) or
below 5 °C (20 °F) in a restricted zone, or exceeds
local regulations, action as above shall be taken.

HAZARDOUS LIQUIDS
When the pump is handling hazardous liquids care must
be taken to avoid expo sure to th e liquid by appro priate
situating the pump, limiting person nel acce ss and by
operator training. If the liquid is flammable and/or
explosive, strict safety procedures must be applied.

Gland packing must not be used when pumping
hazardous liquids.

Page 4 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

appropriate. Always check that the driver, seal and

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.

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, which is quite unusual for a PVML pump due to
the closed coupled design, the Ex rating applies only

ENSURE CORRECT LUBRICATION
(See section 5, Commissioning, start-up, operation
and shutdown.)

START THE PUMP WITH OUTLET
VALVE PARTLY OPENED
(Unless otherwise instructed at a specific point in the
User Instructions.)
This is recommended to minimize the risk of
overloading and damaging the pump motor at full or
zero flow. Pumps may be started with the valve
further open only on installations where this situation
cannot occur. The pump outlet control valve may
need to be adjusted to comply with the duty following
the run-up process. (See section 5, Commissioning
start-up, operation and shutdown.)

NEVER RUN THE PUMP DRY

INLET VALVES TO BE FULLY OPEN
WHEN PUMP IS RUNNING
Running the pump at zero flow or below the
recommended minimum flow continuously will cause
damage to the seal.

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.

to the pump. The party responsible for assembling the
pump set shall select the 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 affects in the motor and so,
for pumps sets with a VFD, the ATEX Certification for
the motor must state that it is 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 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 prEn13463-5)

1.6.4 Products used in potentially explosive atmospheres

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

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.
Both electrical and non-electrical equipment must
meet the requirements of European Directive
94/9/EC.

1.6.4.1 Scope of compliance

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 of 40 °C (104 °F); refer to
Flowserve for higher ambient temperatures.

The surface temperature on the pump is influenced
by the temperature of the liquid handled. The
maximum permissible liquid temperature depends on
the temperature class and must not exceed the
values in the table that follows.

Use equipment only in the zone for whi ch it is

Page 5 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

The temperature rise at the seals and bearings and
due to the minimum permitted flow rate is taken into
account in the temperatures stated.

Temperature

class to

prEN 13463-1

T6
T5
T4
T3
T2
T1

Maximum

surface

temperature

permitted

85 °C (185 °F)

100 °C (212 °F)
135 °C (275 °F)
200 °C (392 °F)
300 °C (572 °F)
450 °C (842 °F)

Temperature limit of liquid

handled (* depending on

material and construction

variant - check which is lower)

Consult Flowserve

Consult Flowserve
115 °C (239 °F) *
180 °C (356 °F) *
275 °C (527 °F) *
400 °C (752 °F) *

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 hazarous 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.

If an explosive atmosphere exists during the
installation, do not attempt to check the direction of
rotation by starting the pump unfilled. Even a short
run time may give a high temperature resulting from
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 it is recommended that
users fit an external surface temperature protection
device.

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

In dirty or dusty environments, regular checks must
be made and dirt removed from areas around close
clearances and motors.

1.6.4.4 Preventing the build up of explosive mixtures

If the operation of the system cannot avoid this
condition the fitting of an appropriate dry run
protection device is recommended (eg liquid
detection or a power monitor).

To avoid potential hazards from fugitive emissions of
vapour 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 motor stool guard must be non-sparking
and anti-static for Category 2.

To avoid the potential hazard from random induced
current generating a spark, the earth contact on the
levelling plate or base plate must be used.

Avoid electrostatic charge: do not rub non-metallic
surfaces with a dry cloth; ensure cloth is damp.

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 ancillary systems.

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

If leakage of liquid to atmosphere can result in a
hazard, the installation of a liquid detection device is
recommended.

1.6.4.7 Maintenance to avoid the hazard

ENSURE THE PUMP IS PROPERLY FILLED

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

pipeline system is totally filled with liquid at all times
during the pump operation, so that an explosive
atmosphere is prevented. In addition it is essential to
make sure that seal chambers, auxiliary shaft seal
systems and any heating and cooling systems are
properly filled.

Page 6 of 29

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.

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

To avoid potential explosion hazards during
maintenance, the tools, cleaning and painting
materials used must not give rise to sparking or
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 is adopted. (See section 6, Maintenance.)

1.7 Nameplate and warning labels

1.7.1 Nameplate

For details of nameplate, see the Declaration of
Conformity.

1.7.2 Warning labels

Page 7 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

1.8 Specific machine performance

For performance parameters see section 1.5, Duty
conditions. When the contract requirement specifies

these to be incorporated into User Instructions these
are included here. Where performance data has
been supplied separately to the purchaser these
should be obtained and retained with these User
Instructions if required.

1.9 Noise level

When pump noise level exceeds 85 dBA attention
must be given to prevailing Health and Safety
Legislation, to limit the exposure of plant operating
personnel to the noise. The usual approach is to
control 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 machines above a
certain power level will exceed 85 dBA. In such
situations consideration must be given to the fitting of
an acoustic enclosure to meet local regulations.

Pump noise level is dependent on a number of factors ­the type of motor fitted, the operati ng cap acit y, pipework
design and acoustic characteri stics of the buildin g.
Typical sound pressure levels measured in dB, and
A-weighted are shown in the t able below (L

). The

pfA

figures are indicative only, they are subject to a +3 dB
tolerance, and cannot be guaranteed.

The values are based on the noisiest electric motors
that are likely to be encountered. They represent
sound pressure levels at 1 m (3.3 ft) from the directly
driven pump, for "free field over a reflecting plane".

If a pump unit only has been purchased, for fitting
with your own driver, then the "pump only" noise
levels from the table should be combined with the
level for the driver obtained from the supplier. If the
motor is driven by an inverter, it may show an
increase in noise level at some speeds. Consult a
Noise Specialist for the combined calculation.

 For units driven by equipment other than electric

motors or units contained within enclosures, see the
accompanying information sheets and manuals.

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

Motor size
and speed

KW (hp)

2.2 (3) 78 72 71 68 71 68 68 68
3 (4) 81 74 74 70 74 70 70 70
4 (5) 82 75 75 71 75 71 71 71

5.5 (7.5) 90 77 83 73 76 73 72 71

7.5 (10) 90 78 83 74 77 74 73 72

11 (15) 91 80 84 76 78 76 74 73
15 (20) 92 83 85 79 80 79 76 75

18.5 (25) 92 83 85 79 80 79 76 75
22 (30) 92 83 85 79 81 79 77 75
30 (40) 100 85 93 81 84 80 80 76
37 (50) 100 86 93 82 84 80 80 76
45 (60) 100 87 93 83 84 80 80 76
55 (75) 102 88 95 84 86 81 82 77
75 (100) 100 90 95 86 88 81 83 78
90 (120) 100 90 95 86 90 81 85 78

110 (150) 100 91 95 87 91 83 86 79
150 (200) 101 92 96 88 91 83 86 79
200 (270)

300 (400) - - - -

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

Pump and

motor

dBA

← ← ← ← ←

Pump

only

dBA

Pump and

motor

dBA

Pump

only

dBA

Pump and

motor

dBA

←

Pump

only

dBA

83
84

Pump and

motor

dBA

←
←

Pump

only

dBA

80
81

← Motors in this range are generally job specific and noise levels should be calculated based on actual equipment installed.

For 960 rpm reduce 1450 rpm values by 5 dBA.

Page 8 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

2 TRANSPORT AND STORAGE

2.1 Consignment receipt and unpacking

Immediately after receipt of the equipment it must be
checked against the delivery and 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 Pump Division and received
in writing within one month of receipt of the
equipment. Later claims cannot be accepted.

Check any crate, boxes and wrappings for any
accessories or spare parts that may be packed
separately with 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 always
quote this number in correspondence as well as when
ordering spare parts or further accessories.

Typical lifting of a PVML with base plate or
extended levelling plate

2.2 Handling

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

2.3 Lifting

To avoid distortion, the pump unit

should be lifted as shown.

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.

Unsafe lifting is never allowed!

2.4 Storage

Store the pump in a clean , dry
location away from vibration. Leave piping
connection covers in place to keep dirt and other
foreign material out of pump casing. Turn pump at
intervals to prevent brinelling of the bearings and
the seal faces, if fitted, from sticking.

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

2.5 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 local regulations. If the
product contains substances that are harmful to the

Page 9 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

environment, these should be removed and disposed
of in accordance with current regulations. This also
includes the liquids and or gases that may be used in
the "seal system" or other utilities.

3.3.4 Extended Motor Shaft

The extended motor shaft, mounted on the motor
bearings is of the dry shaft design and has a keyed
drive end.

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
regulations at all times.

3 PUMP DESCRIPTION

3.1 Configuration

The PVML type pump is a heavy duty, single stage,
vertical closed coupled type centrifugal pump,
designed for petrochemical complexes, chemical
plants, general service and circulating applications. It
can only be used with an electric motor.

3.2 Name nomenclature

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

PVML 30-20-20-30F

Configuration – see 3.1 above.
Nominal impeller size (cm)
Nominal suction branch size (cm)
Nominal discharge branch size (cm)
Nominal max. impeller diameter & type.
The typical nomenclature above is the general guide

to the PVML configuration description. Identify the
actual pump size and serial number from the pump
nameplate. Check that this agrees with the applicable
certification provided.

3.3 Design of major parts

3.3.1 Pump casing

The pump has its main casing gasket axial to the shaft
allowing maintenance to the rotating element by
removing the back pull out unit. Suction and
discharge branches are at the casing and therefore its
piping remain undisturbed at maintenance.

3.3.2 Impeller

The impeller is fully shrouded and is fitted with
impeller wear rings.

3.3.3 Diffuser

The diffuser is tuned to the impeller and the multi
channel diffuser is concentric aligned around the
impeller

3.3.6 Stuffing box

The stuffing box has a spigot (rabbet) fit between
the pump casing and seal plate for optimum
concentricity. The design enables a number of
sealing options to be fitted.

3.3.7 Shaft seal

The mechanical seal(s) attached to the pump shaft
seals the pumped liquid from the environment.
Gland packing may be fitted as an option, for non­hazardous service only.

3.3.8 Driver

The driver is an electric motor.

3.3.9 Accessories

Accessories may be fitted when specified by the
customer.

3.4 Performance and operating limits

This product has been selected t o meet th e
specifications 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 temperature, materials, and seal type may
influence this data. If required, a definitive statement
for your particular application can be obtained from
Flowserve.

3.4.1 Operating limits

Pumped liquid temperature limits* up to +260 ºC (500 ºF)
Maximum ambient temperature* up to +40 ºC (104 ºF)

Maximum soft solids in
suspension*

Maximum pump speed refer to the nameplate

3.4.2 Pump and impeller data

Impeller

Pump size

PVML 25.04.04 220 (8.66) 90/-- (3.54/--) 0.35/-- (0.014/--)
PVML 25.08.08 240 (9.45) 90/130 (3.54/5.12) 0.35/0.43 (0.014/0.017)
PVML 25.10.10 235 (9.25) 130/-- (5.12/--) 0.43/-- (0.017/--)
PVML 25.15.15 242 (9.53) 165/200 (6.50/7.87) 0.45/0.50 (0.018/0.020)
PVML 30.20.20 290 (11.42) 220/265 (8.66/10.43) 0.50/0.55 (0.020/0.022)
PVML 35.08.08 370 (14.57) 110/130 (4.33/5.12) 0.38/0.43 (0.015/0.017)
PVML 35.10.10 370 (14.57) 130/140 (5.12/5.51) 0.43/0.43 (0.017/0.017)
PVML 35.15.15 354 (13.93) 180/220 (7.09/10.43) 0.48/0.50 (0.019/0.020)
PVML 35.20.20 350 (13.78) 220/275(7.09/10.83) 0.50/0.58 (0.020/0.023)
PVML 40.10.10 420 (16.54) 130/140 (5.12/5.51) 0.43/0.43 (0.017/0.017)
PVML 40.15.15 420 (16.54) 220/275(7.09/10.83) 0.50/0.58 (0.020/0.023)

maximum

size

mm (in.)

up to 1 % by volume
(refer for size limits)

Nominal wear
ring diameter

Small / large

mm (in.)

Min.
diametral
wear ring
clearance

mm (in.)

Page 10 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

4 INSTALLATION

Equipment operated in hazardous locations
must comply with the relevant explosion protection
regulations. See section 1.6.4, Products used in

potentially explosive atmospheres.

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

Seal systems for dual seal arrangements may be
supplied loose on PVML pumps. It is the
responsibility of the installer to ensure that the seal
system is properly installed to the pump.

4.3 Foundation

There are many methods of installing
pump units to their foundations. The correct method
depends on the size of the pump unit, its location and
noise vibration limitations. Non-compliance with the
provision of correct foundation and installation may
lead to failure of the pump and, as such, would be
outside the terms of the warranty. Ensure the
following are met.
The levelling plate or base plate should be mounted
onto a firm foundation, either an appropriate thickness
of quality concrete or sturdy steel framework. (It
should NOT be distorted or pulled down onto the
surface of the foundation, but should be supported to
maintain the original alignment.) Concrete is the most
suitable material for the base.

The base should contain recesses for the grouting of
the foundation bolts. Figure 3 shows a number of
variations on the design of the foundation bolts.

 Make these recesses in the base in
accordance with the above figure, referring to the
dimensional drawing of the pump unit.

If a concrete base is used, observe the following
points:

 do not place the pump unit on the base until it

is completely set;

 fill the recesses with water at least 24 hours

before grouting the foundation bolts. Wetting
the recesses will strengthen the bond between
the mortar of the foundation bolts and the base;

 remove the water from the recesses when the

foundation bolts are being grouted;

4.3.1 Positioning the foundation bolts

Take the following points into account when
positioning the pump unit:

 the foundation bolts should be suspended

freely in the recesses of the base;

 the level of the centre line of the suction and

discharge nozzles should correspond with the
centre line of the pipes to be connected;

 the position of the suction and discharge

nozzles in the x and z directions (see Figure 4)
and

 the vertical distance between the base and the

levelling plate (40 mm) before filling with
mortar.

4.4 Grouting

For grouting the same steps are to be taken for a
pump set with (extended) levelling plate or a base
plate, with the distinction that a PVML pump will be
mounted on the levelling plate after grouting of the
levelling plate and a PVML pump on a base plate
will be grouted as unit.

Page 11 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

4.4.1 Grouting of a pump with levelling plate

See below figure for the following procedures.

 lay steel filler blocks on the base on either side of

the foundation bolts;

 place the foundation bolts with nuts in the levelling

plate;

 place the levelling plate on the filler blocks;
 lay thin filler plates under the adjusting bolts;
 remove the nuts from the foundation bolts;
 place the pump unit on the levelling plate in

accordance with the lifting instructions described
in § 3.1. The bolt holes in the base of the pump
should correspond with the bolt holes in the
levelling plate;

 replace the nuts on the foundation bolts;
 adjust the pump unit so that it is roughly level and

at the required height by turning the adjusting
bolts in the levelling plate. Position the levelling
plate so that the suction and discharge flange can
be mounted on the pipe flanges without stress.
There should be a parallelism of 0.1 mm between
the flanges to be connected;

 fill the space between the filler blocks and the

levelling plate with filler plates;

 check that the bolts fit easily into the bolt holes of

the flanges;

 fix the foundation bolts by filling the recesses with

non-shrinkable mortar;

 let the mortar wet in accordance with the

specifications.

4.4.1.1 Adjusting the levelling plate

To make sure that the unit is level, use a calibrated
machine level with an accuracy of 0.02 mm/m

1

.
Measure along the shaft of the electric motor in
both directions or, if this is not possible, along the
seal plate. If the mechanical seal is fitted with a
guard, this should be removed.
 level the levelling plate in the direction P-Q with

an accuracy of 0.15 µm/m (0.002 in./ft) using
the adjusting bolts (see Figure 5). Fill the space
between the filler blocks and the levelling plate
with thin filler plates;

 level the levelling plate in the directions R-S

with an accuracy of 0.15 µm/m (0.002 in./ft)
using the adjusting bolt. Fill the space between
the filler blocks and the levelling plate with thin
filler plates;

 tighten the foundation nuts provisionally by

applying a moment equal to ¼ the maximum
permissible moment (M

) of the foundation

max

bolt;

 check the position and level along the

centreline of the suction and discharge
nozzles. Adjust, if necessary, by following the
procedures given above;

 fill in the outer edges of the levelling plate,

including filler plates, completely using non­shrinkable mortar (e.g. Pagel V1 or equivalent)
and let this cure in accordance with the
specifications;

 remove the foundation nuts and the pump unit

from the levelling plate;



grout the levelling plate, via the
fill opening, completely using non-shrinkable
concrete and let this cure in accordance with
the specifications;

 replace the pump unit on the levelling plate and

locate the foundation nuts with washers;

 tighten the foundation nuts permanently by

applying a moment equal to ¼ the maximum
permissible moment (M

) of the foundation

max

bolt;

 if the guard of the mechanical seal was

removed for levelling, replace it in the correct
position;

 if necessary, draw up a report on the whole

adjustment procedure.

4.4.1 Grouting of a pump with base plate or
extended levelling plate

Page 12 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

a) Install the base plate or extended levelling plate

onto packing pieces evenly spaced and adjacent
to foundation bolts.

b) Level with shims between base plate and packing

pieces [accuracy in both directions 0.15 µm/m
(0.002 in./ft)]

Where applicable, grout in the foundation bolts.
After adding pipework connections the baseplate

should then be grouted in accordance with good
engineering practice. Fabricated steel baseplates can
be filled with grout. If in any doubt, please contact your
nearest service centre for advice.

Grouting provides solid contact between the pump unit
and foundation, prevents lateral movement of running
equipment and dampens resonant vibrations.

Foundation bolts should only be fully tightened when
the grout has cured.

4.5 Initial alignment

4.5.1 Thermal expansion

The PVML pump and motor are designed such that
they will cope with the thermal expansion for pump
application and cope with the pumping temperature as
specified on the pump data sheet. There is no need to
check the alignment at normal service conditions.

4.5.2 Alignment methods

The alignment of the pump with the

piping MUST be checked.

Complete piping as below.

4.6 Piping

Protective covers are fitted to the pipe
connections to prevent foreign bodies entering during
transportation and installation. Ensure that these
covers are removed from the pump before connecting
any pipes.

4.6.1 Suction and discharge pipework

In order to minimize friction losses and hydraulic
noise in the pipework it is good practice to choose
pipework that is one or two sizes larger than the
pump suction and discharge. Typically main
pipework velocities should not exceed 2 m/s (6
ft/sec) suction and 3 m/s (9 ft/sec) on the
discharge.

Take into account the available NPSH which must
be higher than the required NPSH of the pump.

Never use the pump as a support

for piping.
Maximum forces and moments allowed on the

pump flanges vary with the pump size and type. To
minimize these forces and moments that may, if
excessive, cause misalignment, hot bearings,
vibration and the possible failure of the pump
casing, the following points should be strictly
followed:

• Prevent excessive external pipe load

• Never draw piping into place by applying force

to pump flange connections

• Do not mount expansion joints so that their
force, due to internal pressure, acts on the
pump flange

The table on the general arrangement drawing
summarizes the maximum forces and moments
allowed on PVML pump casings. The allowable
forces and moments are also listed in the
addendum (Tab 1) . Refer to Flowserve for other
configurations.
Mount the flanges of the pipes and pump so that
they are parallel with a tolerance of 0.1 mm. Make
sure that the centrelines of the flanges are in line
with each other.

Ensure piping and fittings are

flushed before use.

Ensure piping for hazardous liquids is
arranged to allow pump flushing before removal of
the pump.

4.6.2 Suction piping

a) The inlet pipe should be one or two sizes larger

than the pump inlet bore and pipe bends
should be as large a radius as possible.

b) Pipework reducers should have a maximum

total angle of divergence of 15 degrees.

c) Keep the total length of the suction pipe as

short as possible.

d) A bend in the suction pipe should be located at

a distance of at least 5 times the pipe bore from
the suction flange

Page 13 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

e) Install as few bends as possible in the suction

pipe and select the largest possible radius

f) On suction lift the piping should be inclined up

towards the pump inlet with eccentric reducers
incorporated to prevent air locks.

g) On positive suction, the inlet piping must have a

constant fall towards the pump.

h) Inlet strainers, when used, should have a net `free

area' of at least three times the inlet pipe area.

i) Do not install elbows at an angle other than

perpendicular to the shaft axis. Elbows parallel to
the shaft axis will cause uneven flow.

j) In the case of contaminated liquids, install a

suction strainer or dirt trap with a bore which
matches the bore of the pump..

k) Fitting an isolation valve will allow easier

maintenance.

l) Never throttle pump on suction side and never

place a valve directly on the pump inlet nozzle.

4.6.3 Maximum forces and moments allowed on
PVML pump flanges

Refer to the General Arrangement drawing (tab 1)

4.6.4 Discharge piping

A non-return valve should be located in the discharge
pipework to protect the pump from excessive back
pressure and hence reverse rotation when the unit is
stopped.

Pipework reducers should have a maximum total
angle of divergence of 9 degrees.

Fitting an isolation valve will allow easier
maintenance.

4.6.5 Auxiliary piping

4.6.5.1 Drains

Pipe pump casing drains and gland leakage to a
convenient disposal point.

4.6.5.2 Pumps fitted with gland packing

When suction pressure is below ambient pressure, it
is necessary to feed the gland packing with liquid to
provide lubrication and prevent the ingress of air. This
is normally achieved with a supply from the pump
discharge volute to the stuffing box. A control valve or
orifice plate may have been fitted into the supply line
to control the pressure to the gland / stuffing box.

If the pumped liquid is dirty and cannot be used for
sealing, a separate clean compatible liquid supply to
the gland at 1.5 – 2.0 bar (20 –30 psi) above suction
pressure is recommended.

4.6.5.3 Pumps fitted with mechanical seals

Single seals requiring re-circulation will normally be
provided with the auxiliary piping from pump casing
already fitted.

If the seal requires an auxiliary quench then a
connection must be made to a suitable source of
liquid flow, low pres sure steam or static pressure
from a header tank. Recommended pressure is

0.35 bar (5 psi) or less. Check General
arrangement drawing.

Special seals may require different auxiliary piping
to that described above. Consult separate User
Instructions and/or Flowserve if unsure of correct
method or arrangement.

For pumping hot liquids, to avoid seal damage, it is
recommended that any external flush/cooling
supply be continued after stopping the pump.

4.6.6 Final checks

Check the tightness of all bolts in the suction and
discharge pipework. Check also the tightness of all
foundation bolts.

4.7 Electrical connections

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

4.7.2
EUROPEAN DIRECTIVE on potentially explosive
areas where compliance with IEC60079-14 is an
additional requirement for making electrical
connections.

4.7.3
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.

4.7.4
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.

It is important to be aware of the

It is important to be aware of the

The motor must be wired up in

4.7.5
stopping must be fitted.

Page 14 of 29

A device to provide emergency

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

4.7.6 If not supplied pre-wired to the pump unit, the

controller/starter electrical details will also be supplied
within the controller/starter.

4.7.7 For electrical details on pump sets with

controllers see the separate wiring diagram.

4.7.8

rotation before connecting the motor to the electrical
supply.

4.7.9 This pump unit has an earthing boss for

discharging (static) electricity. Connect the earthing
boss of the pump unit in accordance with the
applicable instructions or commission an approved
electrical engineer to carry out the work.

See section 5.3, Direction of

4.8 Final shaft alignment check

Due to the vertical closed coupled design a final
alignment check is not applicable.

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 or its associated
sealing system 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. See sections

5.7.4 and 5.7.5.

5 COMMISSIONING, START-UP, OPERA TION AND SHUTDOWN

These operations must be carried

out by fully qualified personnel.

5.1 Pre-commissioning procedure

BEFORE START-UP REMOVE

TEMPORARY RUBBER GASKET ABOVE SEAL
DRIVE COLLAR.
GASKET CAN BE EASILY REMOVED BY USING
A KNIFE OR SCISSOR TO MAKE A RADIAL
INCISION.

Before using the pump, flush it with hot water to
remove any preservatives or contaminants. Drain
off the flushing water from underneath the pump.

5.2 Pump lubricants

As the pump is of the Vertical Closed Coupled
design the pump itself is not equipped with
grease or oil connections.

See the electric motor

instructions for the motor lubrication.

The bearings of the electric motor are either re­greasable or greased for life.

5.3 Impeller clearance

No functional adjustments are to be considered.

5.4 Direction of rotation

Ensure the pump is given the same
rotation as the pump direction arrow mounted on
the pump casing.

To avoid dry running the pump must be filled with
liquid.

If maintenance work has been
carried out to the site's electricity supply, the
direction of rotation should be re-checked as above
in case the supply phasing has been altered.

5.5 Guarding

Guarding is supplied fitted to the pump set.
If this has been removed or disturbed ensure that all
the protective guards around the exposed parts of
the shaft are securely fixed.

5.6 Priming and auxiliary supplies

Ensure all electrical, hydraulic,
pneumatic, sealant and lubrication systems (as
applicable) are connected and operational.

Ensure the inlet pipe and pump
casing are completely full of liquid before starting
continuous duty operation.

Page 15 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

5.6.1 Suction pressure above atmospheric pressure

the seal flush line at the mechanical seal/stuffing box
to allow the trapped air to escape. Let liquid run out
until free from air bubbles.
De-aerate the pump via the chamber of the
mechanical seal or via the flange of a pipe connected
to the mechanical seal

5.7 Starting the pump

a) Ensure flushing and/or cooling/
heating liquid supplies are turned ON before starting
the pump.
b) CLOSE the outlet valve.
c) OPEN all inlet valves.
d) Prime the pump.

e)

Ensure all vent connections are closed
before starting.
f) Start motor and check outlet pressure.
g) If the pressure is satisfactory, slowly OPEN outlet
control valve.

h)

Do not run the pump with the outlet
valve closed for a period longer than 30 seconds.
i) If NO pressure, or LOW pressure, STOP the
pump. Refer to section 7, Faults; causes and
remedies, for fault diagnosis.

5.8 Running the pump

5.8.1 Venting the pump

Vent the pump through the mechani cal seal
again, to enable all trapped air to escape taking due
care with hot or hazardous liquids.

Under normal operating conditions, after the pump has
been fully primed and vented, it should be
unnecessary to re-vent the pump.

5.8.2 Pumps fitted with packed gland

If the pump has a packed gland there must be some
leakage from the gland. Gland nuts should initially be
finger-tight only. Leakage should take place soon
after the stuffing box is pressurised.

The gland must be adjusted evenly to give visible
leakage and concentric alignment of the gland ring to
avoid excess temperature. If no leakage takes place
the packing will begin to overheat. If overheating
takes place the pump should be stopped and allowed
to cool before being re-started. When the pump is re­started, check to ensure leakage is taking place at the
packed gland.

If hot liquids are being pumped it may be necessary
to slacken the gland nuts to achieve leakage.

The pump should be run for 30 minutes with steady
leakage and the gland nuts tightened by 10
degrees at a time until leakage is reduced to an
acceptable level, normally a minimum of 120 drops
per minute is required. Bedding in of the packing
may take another 30 minutes.

Care must be taken when adjusting the gland
on an operating pump. Safety gloves are essential.
Loose clothing must not be worn to avoid being
caught up by the pump shaft. Shaft guards must
be replaced after the gland adjustment is complete.

Never run gland packing dry, even

for a short time.

5.8.3 Pumps fitted with mechanical seal
Mechanical seals require no adjustment. Any slight
initial leakage will stop when the seal is run in.

Before pumping dirty liquids it is advisable, if
possible, to run in the pump mechanical seal using
clean liquid to safeguard the seal face.

External flush or quench should be
started before the pump is run and allowed to flow
for a period after the pump has stopped.

Never run a mechanical seal dry,
even for a short time.

5.8.4 Bearings

If the pumps are working in a potentially
explosive atmosphere, temperature or vibration
monitoring at the motor bearings is recommended.

If bearing temperatures are to be monitored it is
essential that a benchmark temperature is recorded
at the commissioning stage and after the bearing
temperature has stabilized.

• Record the bearing temperature (t) and the

ambient temperature (ta)

• Estimate the likely maximum ambient

temperature (tb)

• Set the alarm at (t+tb-ta+5) °C [(t+tb-ta+10) °F]

and the trip at 100 °C (212 °F) for oil lubrication
and 105 °C (220 °F) for grease lubrication

It is important, particularly with grease lubrication,
to keep a check on bearing temperatures. After
start up the temperature rise should be gradual,
reaching a maximum after approximately 1.5 to 2
hours. This temperature rise should then remain
constant or marginally reduce with time. (Refer to
section 6.1.1 for further information.)

Page 16 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

5.8.5 Normal vibration levels, alarm and trip

For guidance, pumps generally fall under a
classification for rigid support machines within the
International rotating machinery standards (API 610,
latest ed./ISO 13709, latest ed.) and the
recommended maximum levels below are based on
those standards.

Alarm and trip values for installed
pumps should be based on the actual measurements
(N) taken on the pump in the fully commissioned as
new condition. Measuring vibration at regular
intervals will then show any deterioration in pump or
system operating conditions.

Vibration velocity – unfiltered

mm/s (in./s) r.m.s.
Normal N
Alarm N x 1.25
Shutdown trip N x 2.0

Overhung pumps

≤ 3.0 (0.12)
≤ 3.9 (0.15)
≤ 4.5 (0.18)

5.8.6 Stop/start frequency

Pump sets are normally suitable for the number of
equally spaced stop/starts per hour shown in the table
below. Check actual capability of the driver and
control/starting system before commissioning.

Motor rating kW (hp)

Up to 15 (20) 15

Between 15 (20) and 90 (120) 10

Above 90 (120) 6

Maximum stop/starts

per hour

Where duty and standby pumps are installed it is
recommended that they are run alternately every
week.

5.9 Stopping and shutdown

a) Close the outlet valve, but ensure

that the pump runs in this condition for no more

than a few seconds.
b) Stop the pum p.
c) Switch off flushing and/or cooling/heating liquid

supplies at a time appropriate to the process.
d)

For prolonged shut-downs and
especially when ambient temperatures are likely
to drop below freezing point, the pump and any
cooling and flushing arrangements must be
drained or otherwise protected.

5.10 Hydraulic, mechanical and electrical duty

This product has been supplied to meet the
performance specifications of your purchase order,
however it is understood that during the life of the
product these may change. The following notes may
help the user decide how to evaluate the implications

of any change. If in doubt contact your nearest
Flowserve office.

5.10.1 Specific gravity (SG)

Pump capacity and total head in metres (feet) 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 over­pressurize the pump.

5.10.2 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 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.

5.10.3 Pump speed

Changing pump speed effects flow, total head,
power absorbed, NPSH

, noise and vibration.

R

Flow varies in direct proportion to pump speed,
head varies as speed ratio squared and power
varies as speed ratio cubed. The new duty,
however, will also be dependent on the system
curve. If increasing the speed, it is important
therefore to ensure the maximum pump working
pressure is not exceeded, the driver is not
overloaded, NPSH

> NPSHR, and that noise and

A

vibration are within local requirements and
regulations.

5.10.4 Net positive suction head (NPSH

NPSH available (NPSH

) is a measure of the head

A

)

A

available in the pumped liquid, above its vapour
pressure, at the pump suction branch.

NPSH required (NPSH

) is a measure of the head

R

required in the pumped liquid, above its vapour
pressure, to prevent the pump from cavitating. It is
important that NPSH
between NPSH

> NPSHR should be as large as

A

A > NPSH

. The margin

R

possible.
If any change in NPSH

is proposed, ensure these

A

margins are not significantly eroded. Refer to the
pump performance curve to determine exact
requirements particularly if flow has changed. If in
doubt please consult your nearest Flowserve office
for advice and details of the minimum allowable
margin for your application.

5.10.5 Pumped flow

Flow must not fall outside the minimum and
maximum continuous safe flow shown on the pump
performance curve and or data sheet.

Page 17 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

6 MAINTENANCE

6.0 General

It is the plant operator's responsibility to ensure
that all maintenance, inspection and assembly work is
carried out by authorized and qualified personnel who
have adequately familiarized themselves with the
subject matter by studying this manual in detail. (See
also section 1.6.2.)

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 5.8.

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, Commissioning, start
up, operation and shut down must be observed.

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.

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 an uncontrolled start. Put a warning board on
the starting device with the words:
"Machine under repair: do not start".

With electric drive equipment, lock the main switch
open and withdraw any fuses. Put a warning board on
the fuse box or main switch with the words:
"Machine under repair: do not connect".

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

6.1 Maintenance schedule

It is recommended that a maintenance plan
and schedule is adopted, in line with these User
Instructions. It should include the following:
a) Any auxiliary systems installed must be

monitored, if necessary, to ensure they function
correctly.

b) Gland packings (if applied instead of a

mechanical seal) must be adjusted correctly to
give visible leakage and concentric alignment
of the gland follower to prevent excessive
temperature of the packing or follower.

c) Check for any leaks from gaskets and seals.

The correct functioning of the shaft seal must
be checked regularly.

d) Check motorbearing lubricant at intervals as

described in the motor instructions.

e) Check that the duty condition is in the safe

operating range for the pump.

f) Check vibration, noise level and surface

temperature at the bearings to confirm
satisfactory operation.

g) Check dirt and dust is removed from areas

around close clearances and motors.

Our specialist service personnel can help with
preventative maintenance records and provide
condition monitoring for temperature and vibration
to identify the onset of potential problems.

If any problems are found the following sequence
of actions should take place:
a) Refer to section 7, Faults; causes and

remedies, for fault diagnosis.

b) Ensure equipment complies with the

recommendations in this manual.

c) Contact Flowserve if the problem persists.

6.1.1 Routine inspection (daily/weekly)

The following checks should be
made and the appropriate action taken to remedy
any deviations:
a) Check operating behaviour. Ensure noise,

vibration and bearing temperatures are normal.

b) Check that there are no abnormal fluid or

lubricant leaks (static and dynamic seals) and
that any sealant systems (if fitted) are full and
operating normally.

c) Check that shaft seal leaks are within

acceptable limits.

d) For motors with recharge filled bearings, check

running hours since last recharge of grease or
complete grease change.

e) Check any auxiliary supplies e.g.

heating/cooling, if fitted, are functioning
correctly.

Page 18 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

surfaces (if necessary) with preservative is

 Refer to the manuals of any associated

equipment for routine checks needed.

6.1.2 Periodic inspection (six monthly)

a)

of attachment and corrosion.

b) Check pump running records for hourly usage to

determine if motor bearing lubricant requires
changing.

Check foundation bolts for security

 Refer to the manuals of any associated

equipment for periodic checks needed.

6.1.3 Mechanical seals

No adjustment is possible. When leakage reaches an
unacceptable level the seal will need replacement.

6.1.4 Gland packing

The stuffing box split gland can be completely
removed for re-packing or to enable the addition of
extra rings of packing.

The stuffing box is normally supplied with a lantern
ring to enable a clean or pressurised flush to the
centre of the packing. If not required, this can be
replaced by an extra 2 rings of packing.

There must always be a small leakage, normally a
minimum of 120 drops per minute to atmosphere to
lubricate and cool the packing is required.

6.2 Spare parts

6.2.1 Ordering of spares

Flowserve keep records of all pumps that have been
supplied. When ordering spares the following
information should be quoted:

1) Pump serial number.

2) Pump size.

3) Part name – taken from section 8 and
relevant P.O. related parts list. (Tab 1)

4) Part number – taken from relevant P.O.
related parts list. (Tab 1)

5) Number of parts required.

The pump size and serial number are shown on the
pump nameplate.

To ensure continued satisfactory operation,
replacement parts to the original design specification
should be obtained from Flowserve.
Any change to the original design specification
(modification or use of a non-standard part) will
invalidate the pump’s safety certification.

6.2.2 Storage of spares

Spares should be stored in a clean dry area away
from vibration. Inspection and re-treatment of metallic

recommended at 6 monthly intervals.

6.3 Recommended spares and consumable items

For start up purposes (Initial spares):

1 - set of gaskets and seals
(optional: 1 - complete set of gland packing)

For initial stock (Normal spares):

1 - set of motor bearings (line and thrust)
1 - mechanical seal or set of seal faces
2 - sets of gaskets and seals
2 - casing wear rings
(optional: 2 - sets of gland packing

2 - shaft sleeves
2 - lantern rings
2 - impeller wear rings)

For 2 years operation:

1 - set of motor bearings (line and thrust)
1 - mechanical seal
2 - sets of gaskets and seals
2 - casing wear rings
2 - impeller wear rings
1 - impeller
1 - diffuser
(optional: 2 - sets of gland packing

2 - shaft sleeves
2 - lantern rings
2 - impeller wear rings)

6.4 Tools required

A typical range of tools that will be required to
maintain these pumps is listed below.

Readily available in standard tool kits, and
dependent on pump size:

• Open ended spanners (wrenches) to suit up to

M 48 screws/nuts

• Socket spanners (wrenches), up to M 48

screws

• Allen keys, up to 10 mm (A/F)

• Range of screwdrivers

• Soft mallet

More specialized equipment:

• Bearing pullers

• Bearing induction heater

• Dial test indicator

Page 19 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

6.5 Fastener torques

Application

Casing studs

M 12
M 16
M 20
M 24
M 30

Seal studs, all cases

(back mounted seal)

Seal bolts

(front mounted seal)

M10
M12

Packed gland studs Finger tight Finger tight

Impeller screw

M8
M12
M16
M20
M24

Torque Nm (lbft)

Lubricated Not lubricated

55 (41)

110 (81)
170 (126)
247 (182)
519 (383)

125 145

25 (18)
34 (25)

6 (4.5)
23 (17)
57 (42)

114 (84)

180 (133)

65 (48)
165 (122)
285 (211)
375 (277)
540 (399)

30 (22)

40 (30)

7 (5.2)
25 (18)
60 (44)

120 (89)

190 (140)

6.6 Setting impeller clearance

As wear takes place between the impeller and casing
ring the overall efficiency of the pump set will
decrease. To maintain optimum efficiency it is
recommended that rings are replaced and the impeller
renovated when the diametral clearance detailed in
section 3.4.2 has doubled to 0.7 to 1.1 mm (0.028 to

0.043 in.), depending on pump size and wearing ring
diameter.

6.7 Disassembly

Refer to section 1.6, Safety, before dismantling

the pump.

Before dismantling the pump for
overhaul, ensure genuine Flowserve replacement
parts are available.
Refer to sectional drawings for part numbers and
identification.

6.7.1 Removing the 'back pull out' unit

The 'back pull out' unit is removed by following the
procedure given below:

 remove the nuts [6581.1] from the casing cover.
 attach the lifting devices to the appropriate lifting

points, see Figure 1. Observe the lifting
instructions described in section 2.3.

This type of packing may only

be used once.

6.7.2 Removing the diffuser

This procedure describes removal of the diffuser
from the casing cover.

 Bend open the lock washers [6541] and

remove the hexagon head bolts [6577.1] from
the diffuser.

 Remove the diffuser.

6.7.2 Removing the impeller

This procedure describes removal of the impeller
from the shaft of the electric motor.

 fix the shaft sleeve of the mechanical seal in

place using the face plates on top of the cover
of the mechanical seal.

 undo the impeller screw [2913] with left-hand

thread. The impeller screw is locked in the bore
hole in the impeller by twisting the impeller
screw.

 remove the impeller screw and the packing ring

[4590.4] between impeller and impeller screw.

This type of packing may only be used
once. Dispose of the packing ring in the proper

way.

 push the impeller from the shaft of the electric

motor and remove the released key [6700].

 remove packing ring [4590.3] between the

impeller and the shaft sleeve of the mechanical
seal.

This type of packing may only

be used once. Dispose of the packing ring in

the proper way.

6.7.3 Removing the motor stool

With a 'back mounted' construction, the mechanical
seal is mounted on the top of the casing cover
which means that the motor stool has to be
detached from the casing cover before
disassembling the mechanical seal.

 Place the bottom of the casing cover on a flat

surface.

 lift the casing cover up. Work carefully as there is

not much clearance between the diffuser and the
pump casing.

 remove the packing ring [4590.2] from the pump

casing and dispose of this in the proper way.

Page 20 of 29

 Remove the bolts [6577.2].
 Lift the motor stool up vertically. Work carefully

as long as the shaft of the electric motor is still
inserted in the shaft sleeve.

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

F

F

®

6.7.4 Removing the electric motor

This procedure describes removal of the electric motor
from the motor stool. .

 Place the bottom of the motor stool on a support

due to the projecting shaft of the electric motor.

 If the pump is provided with an Inpro Seal, first

release the thrower [2540]. For disassembly
instructions see suppliers documentation.

 Remove the hexagon head bolts [6577.3].
 Lift the electric motor up vertically. Make sure that

the centring rims are not damaged.

 Remove the thrower [2540] from the shaft of the

electric motor.

6.7.5 Removing the mechanical seal

This procedure describes removal of the mechanical
seal from the casing cover.

 Remove the nuts [6581.2] from the mechanical

seal on top of the cover.

 Remove the mechanical seal.
 Do not dismantle the mechanical seal any further.

For further information on the mechanical seal, please
refer to the instructions for use provided by the
relevant supplier.

6.7.5 Removing the case wearing rings

This is the procedure to be followed when removing
the case wearing ring from the diffuser and, if
applicable, the case wearing ring in the casing cover.
This depends on the structural design.

The case wearing ring has been pressed or shrunk

 Chip off the

remaining edges
of the drilled holes
using a hammer
and chisel, see
Figure. Make sure
that the centring
rim is not
damaged.

 Remove the

halves of the case
wearing ring and

igure : Removing the case

wearing ring

the metal chips
from the pump
casing or casing
cover.

6.7.6 Removing the impeller wearing rings

The impeller wearing rings [2300.1 & 2] have been
shrunk or pressed onto the impeller during
assembly. Therefore a suitable extraction tool must
be used for disassembly.

 Remove set screws [6570.2]. These set screws

lock the impeller wearing ring against the
impeller.

 Remove the impeller wearing ring from the

impeller using the extraction tool.

 Drill 3 holes at 120° intervals in the partition

between impeller wearing ring and impeller.
Drill the holes to a depth such that the set
screws [6570.2] do not protrude above the
surface of the impeller wearing ring and
impeller.

into the centring rim during assembly which means
that it will be necessary to drill or cut into the case
wearing ring in order to weaken the upright edge.

 Remove the set screws [6570.1]. These set

screws lock the case wearing ring against the
diffuser [1410].

 Measure width & height of the case wearing ring.
 Take a drill with a slightly smaller diameter than

the width of the case wearing ring.

 Drill two holes along

the centre line of the
upright edge of the
case wearing ring,
see Figure. Drill both

6.7.7 Removing the neck bush

This procedure describes removal of the neck
(throttle) bush from the casing cover.

 Remove set screws [6570.3] from the bottom of

the casing cover. These set screws lock the
neck bush [4132] against the casing cover.

 Remove the neck bush from the casing cover.

If this cannot be done by hand, remove it from
the casing cover by tapping with a suitable
copper rod and a hammer.

6.8 Examination of parts

holes not deeper than
the measured height
of the case wearing
ring.

before assembly to ensure the pump will
subsequently run properly.

Used parts must be inspected

igure : Drilling of the case wearing

Page 21 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

In particular, fault diagnosis is essential to enhance
pump and plant reliability.

6.8.1 Casing, seal plate, diffuser and impeller

a) Inspect for excessive wear, pitting, corrosion,

erosion or damage and any sealing surface
irregularities.

b) Replace as necessary.

6.8.2 Motor shaft and stub sleeve (if fitted)

Although the pump is in most executions of the “dry
shaft design” Replace if grooved, pitted or worn.

6.8.3 Gaskets and O-rings

After dismantling, discard and replace.

6.8.4 Motor bearings

a) It is recommended that bearings are not re-used

after any removal from the shaft.

6.9 Assembly

To assemble the pump consult the sectional drawings,
see section 8, Parts list and drawings.

Ensure threads, gasket and O-ring mating faces are
clean. Clean all parts carefully before assembly and
replace any which are worn or damaged. Apply thread
sealant to non-face sealing pipe thread fittings.

6.9.1 Fitting the neck bus

This procedure describes the fitting of the neck
(throttle) bush into the casing cover.

 Clean the mounting surfaces of the impeller

wearing ring and the impeller.



Use the appropriate personal
protection equipment when heating and positio­ning the impeller wearing ring.

 Heat the impeller wearing ring to a temperature

of 120 to 150°C. Take care if the impeller
wearing ring has a sprayed-on layer of chrome
as this may break away if heating or cooling is
carried out quickly.

 Push the impeller wearing ring right over the

impeller and let the whole assembly cool down.

 Tap screw thread into the 3 holes and remove

the metal chips.

 Mount the set screws [6570.2].
 Fix the set screws using a centre point.

6.9.3 Fitting the case wearing rings

The procedure specified below is to be followed
with regard to the installation of the case wearing
ring [1500.1] in the diffuser. The same procedure
can be followed when installing the case wearing
ring in the casing cover. Read casing cover instead
of diffuser.

 Clean the mounting surfaces of the case

wearing ring [1500.1 & 2], the diffuser gland
and the pump casing.

 Clean the mounting surfaces of the neck bush

[4132] and the casing cover.

 Fit the neck bush in the casing cover on the top

side.

The neck bush should be fixed in relation to the casing
cover using 3 set screws [6570.3].

 Drill 3 holes at 120° intervals in the partition

between neck bush and casing cover. Drill the
holes to a depth such that the set screws [6570.3]
do not protrude above the surface of the neck
bush and the casing cover.

 Tap screw thread into the 3 holes and remove the

metal chips.

 Mount the set screws.
 Fix the set screws using a centre point.

6.9.2 Fitting the impeller wearing rings

The procedure specified below is to be followed
with regard to the impeller wearing rings [2300.1 & 2]

on one or both sides of the impeller.



Use the correct personal
protection equipment when cooling and
positioning the case wearing ring.

 Cool the case wearing ring using liquid

nitrogen.

 Lower the case wearing ring vertically in the

diffuser and wait until the case wearing ring is
tight.

 Drill 3 holes at 120° intervals in the partition

between the case wearing ring and diffuser.
Drill the holes to a depth such that the set
screws [6570.2] do not protrude above the
surface of the case wearing ring and the
diffuser plate.

 Tap screw thread into the 3 holes and remove

the metal chips.

 Mount the set screws [6570.2].
 Fix the set screws using a centre point.

Page 22 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

6.9.4 Installing the mechanical seal

This procedure describes assembly of the mechanical
seal to the casing cover.

 Clean the supporting surfaces of the mechanical

seal and the casing cover.

 Place a new packing ring [see seal dwg.] in the

casing cover or O-ring on the seal plate,
depended from the seal type.

 Place the mechanical seal in the casing cover in

accordance with the instructions for use provided
by the relevant supplier.

 Tighten the nuts [6581.2] for fixing the mechanical

seal to the casing cover by applying the
prescribed torque, see section 6.5.

6.9.5 Fitting the electric motor

This procedure describes assembly of the electrical
motor to the motor stool.

 If the pump is provided with an Inpro seal, it must

be mounted first; for instructions see suppliers
documentation.

 Attach the lifting devices to the appropriate lifting

points. Observe the lifting instructions described in
section 2.3.

The lifting lugs fixed to the motor
are sufficient to lift the motor, but are not suitable
to lift the total unit.

 Place the bottom of the motor stool on a support

due to the protruding shaft of the electric motor.

 Clean the mounting surfaces of the electric motor

and the motor stool.

 Carefully lower the flange of the electric motor

vertically onto the motor stool. Make sure that the
centring rims are not damaged.

 Assemble the hexagon head screws [6577.3].
 Fix the thrower [2540] on the shaft of the electric

motor. Keep a distance of about 5 mm between
the thrower and the electric motor.

6.9.6 Fitting the motor stool

This procedure describes assembly of the motor stool
to the casing cover.

 Clean the mounting surfaces of the motor stool

and the casing cover.

 Carefully place the shaft of the electric motor in

the shaft sleeve so that the motor stool is resting.

 Tighten the bolts [6577.2].

6.9.7 Fitting the impeller

This procedure describes assembly of the impeller
to the shaft of the electric motor.

 Attach the lifting devices to the appropriate

lifting points and observe the lifting instructions
described in section 2.3.

 Lift up the electric motor, the motor stool and

the casing cover as a single assembly so that
the end of the shaft of the electric motor is
easily accessible.

4590.4

4590.3

4590.4

Figure: Locking impeller screw

 Place the key [6700] in the shaft of the electric

motor with the beveled side towards the
outside of the shaft of the electric motor in the
direction of the electric motor. See Figure.

 Place a new packing ring [4590.3] against the

shaft sleeve of the mechanical seal.

 Slide the impeller over the shaft of the electric

motor.

 Fit a new packing ring [4590.4] according to

Figure.

 Place the packing ring [4590.4] on the impeller

screw [2913] with the cut off edge at the bore
hole.

 Turn the impeller screw to the left by applying

the prescribed torque, see section 6.5. Make
sure that the cut off edge of the packing ring
[4590.4] remains in.

 Lock the impeller screw by knocking the edge

of the impeller screw into the bore hole in the
impeller using a hammer and a centre punch.

Release the mounting of the shaft sleeve of the
mechanical seal by sliding back the face plates and
secure these in the retracted position.

Page 23 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

6.9.8 Fitting the diffuser

This procedure describes assembly of the diffuser into
the casing cover.

 Clean the surfaces of the diffuser and the casing

cover.

 Place the diffuser [1410] on the casing cover.

Make sure that the centring rim is not damaged.

 Mount the hexagon head bolts [6577.1] with lock

washers [6541].

 Lock the hexagon head screws [6577.1] against

the diffuser using the lock washers [6541].

6.9.9 Fitting the back pull out unit

This procedure describes assembly of the 'back pull
out' unit to the pump casing.

 Clean the supporting surfaces of the casing cover

and the pump casing.

 Clean internally machined surfaces which come

into contact with liquid and surfaces where there
is only a narrow gap between them and other
finished surfaces. Treat these surfaces with e.g.
Molykote G (spray or paste).

 Connect all auxiliary pipes in accordance with

the dimensioned drawing, the “Process and
Instrumentation Diagram” (P&ID) or the
“Auxiliary Piping Arrangement Drawing”.

 Reconnect the electric motor in accordance

with the instructions for use provided by the
relevant supplier.

 Place a new packing ring [4590.2] onto the rim of

the pump casing.

 Attach lifting devices at the appropriate lifting

points. Observe the lifting instructions described in
section 2.3.

The lifting lugs fixed to the motor
are sufficient to lift the motor, but are not suitable
to lift the total unit.

 Lift the casing cover above the pump casing and

make sure that the casing cover is in the correct
position in relation to the pump casing. There is
only one way for the casing cover to fit onto the
pump casing.

 Carefully place the casing cover on the pump

casing. Work carefully as there is little clearance
between the diffuser and the pump casing. Also
make sure that the centering rim of the casing
cover is not damaged.

 Tighten the nuts [6581.1] evenly across the casing

cover by applying the prescribed tightening torque
in accordance with table per section 6.5.

6.9.10 Fitting other parts

 Clean the supporting surfaces of the casing cover

and the pump casing.

Page 24 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump overheats and seizes

Bearings have short life

⇓

⇓

Pump vibrates or is noisy

⇓

⇓

Mechanical seal has short life

⇓

⇓

Mechanical seal leaks excessively

⇓



 

 

 


  Air leaks into suction line. Check suction pipe is airtight.

 

  Foot valve too small. Investigate replacing the foot valve.
  Foot valve partially clogged. Clean foot valve.
 

 Speed too high. CONSULT FLOWSERVE.



 Specific gravity of liquid different from design.


 

⇓

Pump requires excessive power

⇓

⇓

Pump loses prime after starting

⇓

⇓

Insufficient pressure developed

⇓

⇓

Insufficient capacity delivered

⇓

⇓

Pump does not deliver liquid

⇓

⇓

⇓

⇓

PROBABLE CAUSES POSSIBLE REMEDIES

 Pump not primed.

Pump or suction pipe not completely filled with

 

liquid.

 

Suction lift too high or level too low.
Insufficient margin between suction pressure and

 



 

  

 

 

  

  

 

vapour pressure.

Excessive amount of air or gas in liquid. Check and purge pipes and system.

Air or vapour pocket in suction line. Check suction line design for vapour pockets.

Air leaks into pump through mechanical seal,
sleeve joints, casing joint or pipe plugs.

Inlet of suction pipe insufficiently submerged. Check out system design.
Speed too low. CONSULT FLOWSERVE.

Total head of system higher than differential head
of pump.

Total head of system lower than pump design
head.

Viscosity of liquid differs from that for which
designed.

Operation at very low capacity. Measure value and check minimum permitted.

Operation at high capacity. Measure value and check maximum permitted.

A. System troubles

Check complete filling. Vent and/or prime.

Check NPSH
losses at strainers and fittings.

Check and replace faulty parts.
CONSULT FLOWSERVE.

Check system losses.
Remedy or CONSULT FLOWSERVE.

Check and CONSULT FLOWSERVE.

Remedy or CONSULT FLOWSERVE.

Remedy or CONSULT FLOWSERVE.

>NPSHR, proper submergence,

A

B. Mechanical troubles

     



    

  
    

 Rotating part rubbing on stationary part internally. Check and CONSULT FLOWSERVE, if necessary.

Bearings worn Replace bearings.

Misalignment due to pipe strain. Check the flange connections and eliminate strains

using elastic couplings or a method permitted.

Improperly designed foundation. Check setting of levelling or base plate: tighten,

adjust, grout base as required.

Shaft bent. Check shaft runouts are within acceptable values.

CONSULT FLOWSERVE.

Page 25 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

FAULT SYMPTOM

Pump overheats and seizes

Bearings have short life

⇓

⇓

Pump vibrates or is noisy

⇓

⇓

Mechanical seal has short life

⇓

⇓

Mechanical seal leaks excessively

⇓




 Leakage under sleeve due to joint failure. Replace joint and check for damage.

    

    

  

⇓

Pump requires excessive power

⇓

⇓

Pump loses prime after starting

⇓

⇓

Insufficient pressure developed

⇓

⇓

Insufficient capacity delivered

⇓

⇓

Pump does not deliver liquid

⇓

⇓

⇓

⇓

PROBABLE CAUSES POSSIBLE REMEDIES

 

Wearing ring surfaces worn. Replace worn wear ring/surfaces.

 

 

Shaft sleeve worn or scored or running off centre. Check and renew defective parts.

  

  

  
 

 

 

 

Excessive grease in ball bearings. Check method of regreasing.

 

 

 

Impeller out of balance resulting in vibration.

Abrasive solids in liquid pumped.

Impeller damaged or eroded. Replace or CONSULT FLOWSERVE for improved

Mechanical seal improperly installed. Check alignment of faces or damaged parts and

Incorrect type of mechanical seal for operating
conditions.

Shaft running off centre because of worn bearings. Check misalignment and correct if necessary. If

Internal misalignment of parts preventing seal ring
and seat from mating properly.

Mechanical seal was run dry. Check mechanical seal condition and source of dry

Internal misalignment due to improper repairs
causing impeller to rub.

Excessive thrust caused by a mechanical failure
inside the pump.

Lack of lubrication for bearings. Check hours run since last change of lubricant, the

Improper installation of bearings (damage during
assembly, incorrect assembly, wrong type of
bearing etc).

Damaged bearings due to contamination. Check contamination source and replace damaged

material selection.

assembly method used.
CONSULT FLOWSERVE.

alignment satisfactory check bearings for excessive
wear.

Check and CONSULT FLOWSERVE.

running and repair.
Check method of assembly, possible damage or

state of cleanliness during assembly.
Remedy or CONSULT FLOWSERVE, if necessary.

Check wear condition of impeller, its clearances and
liquid passages.

schedule and its basis.
Check method of assembly, possible damage or

state of cleanliness during assembly and type of
bearing used. Remedy or CONSULT
FLOWSERVE, if necessary.

bearings.

C. MOTOR ELECTRICAL PROBLEMS
 
  Motor running on 2 phases only. Check supply and fuses.

 

 Motor running too slow. Check motor terminal box connections and voltage.

 

Wrong direction of rotation. Reverse 2 phases at motor terminal box.

Page 26 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

8 PARTS LIST AND DRAWINGS

8.1 Typical Sectional drawing

8.2 Typical Parts list For P.O. related parts list see Tab 1

Ref. no. Description

1100 Casing
1221 Casing cover
1410 Diffuser

1500.1 Case wearing ring

1500.2 Case wearing ring
2200 Impeller

2300.1 Impeller wearing ring

2300.2 Impeller wearing ring
2430 Throttling sleeve-Stub sleeve
2540 Thrower
2913 Impeller screw
3160 Motor stool
4132 Neck bush

4590.2 Gasket

4590.3 Gasket

4590.4 Gasket

Ref. no. Description

4610 O-ring
6130 Sole plate
6541 Lock washer
6562 Protective guard

6570.1 Screw

6570.2 Screw

6570.3 Screw

6572.1 Stud continuous

6572.2 Stud continuous

6577.1 Hexagon head bolt

6577.2 Hexagon head bolt

6577.3 Hexagon head bolt

6581.1 Hexagon nut

6581.2 Hexagon nut
6700 Key
8220 Direction of rotation indicator

Page 27 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

8.3 General arrangement drawing

The typical general arrangement drawing and any
specific drawings required by the contract will be sent
to the Purchaser separately unless the contract
specifically calls for these to be included into the User
Instructions. If required, copies of other drawings
sent separately to the Purchaser should be obtained
from the Purchaser and retained with these User
Instructions.

9 CERTIFICATION

Certificates determined from the Contract
requirements are provided with these Instructions
where applicable. Examples are certificates for CE
marking, ATEX marking etc. If required, copies of
other certificates sent separately to the Purchaser
should be obtained from the 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 system 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 its supply, a
record of the details should be maintained with these
User Instructions.

10.3 Additional sources of information

Reference 1:

API 610, 9

Reference 2:

NPSH for Rotordynamic Pumps: a reference guide,
Europump Guide No. 1, Europump & World Pumps,
Elsevier Science, United Kingdom, 1999.

Reference 3:

Pumping Manual, 9th edition, T.C. Dickenson,
Elsevier Advanced Technology, United Kingdom,

1995.
Reference 4:

Pump Handbook, 2
McGraw-Hill Inc., New York, 1993.

Reference 5:

ANSI/HI 1.1-1.5
Centrifugal Pumps - Nomenclature, Definitions,
Application and Operation.

Reference 6:

ANSI B31.3 - Process Piping.

Reference 7:

Europump Terminology standard

th

edition / ISO 13709, January 2003

nd

edition, Igor J. Karassik et al,

Page 28 of 29

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05

®

FLOWSERVE

REGIONAL SALES OFFICES:

Europe, Middle East & Africa

Flowserve Limited (Pump Division)
Harley House, 94 Hare Lane
Claygate, Esher, Surrey KT10 0RB
United Kingdom

Tel [phone]
Fax [phone]

USA and Canada

Flowserve Corporation (Pump Division)
Millennium Center, 222 Las Colinas Blvd.

th

15

Floor, Irving, TX 75039-5421, USA

Tel [phone]
Toll free 800 728 PUMP (7867)
Fax [phone]

Visit our web site at: www.flowserve.com

Your Flowserve factory contact:

Flowserve B.V.

P.O. Box 55
Lansinkesweg 30
7550 AB The Netherlands

Tel [phone]
Fax [phone]

Latin America

Flowserve S.A. de C.V.
Avenida Paseo de la Reforma 30

nd

2

Floor, Colonia Juarez Centro

Mexico, D.F.Z.C. 06040
Tel [phone]

Fax [phone]

Asia Pacific

Flowserve Pte Ltd (Pump Division)
200 Pandan Loop, 06-03/04
Pantech 21, Singapore 128388

Tel [phone]
Fax [phone]

Your local Flowserve representative:

To find your local Flowserve representative, please
use the Sales Support Locator System found at
www.flowserve.com

Page 29 of 29