Flowserve LNN User Manual

USER INSTRUCTIONS

WORTHINGTON® LNN, LNNV and LNNC
centrifugal pumps

Installation

Operation

Maintenance

Single stage, double suction, horizontally split, volute type
centrifugal pumps

PCN=71569074 06-14 (E). (Based on C953KH001.)
Original instructions.

These instructions must be read prior to installing,

operating, using and maintaining this equipment.

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

CONTENTS

Page

1 INTRODUCTION AND SAFETY .......................... 4

1.1 General ........................................................... 4

1.2 CE marking and approvals.............................. 4

1.3 Disclaimer ....................................................... 4

1.4 Copyright ......................................................... 4

1.5 Duty conditions ............................................... 4

1.6 Safety .............................................................. 5

1.7 Nameplate and safety labels .......................... 8

1.8 Specific machine performance ....................... 9

2 TRANSPORT AND STORAGE .......................... 10

2.1 Consignment receipt and unpacking ............ 10

2.2 Handling ........................................................ 10

2.3 Lifting ............................................................. 10

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

2.5 Recycling and end of product life .................. 10

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

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

3.2 Name nomenclature ....................................... 11

3.3 Design of major parts ..................................... 11

3.4 Performance and operating limits ................. 12

4 INSTALLATION .................................................. 13

4.1 Location......................................................... 13

4.2 Part assemblies ............................................ 13

4.3 Foundation .................................................... 13

4.4 Grouting ........................................................ 14

4.5 Initial alignment ............................................. 14

4.6 Piping ............................................................ 15

4.7 Final shaft alignment check .......................... 19

4.8 Electrical connections ................................... 19

4.9 Protection systems ........................................ 20

5 COMMISSIONING, START-UP, OPERATION

AND SHUTDOWN ............................................. 20

5.1 Pre-commissioning procedure ...................... 20

5.2 Pump lubricants ............................................ 21

5.3 Direction of rotation ....................................... 22

5.4 Guarding ....................................................... 22

5.5 Priming and auxiliary supplies ...................... 23

5.6 Starting the pump .......................................... 23

5.7 Running the pump ......................................... 23

5.8 Stopping and shutdown ................................ 25

5.9 Hydraulic, mechanical and electrical duty..... 25

Page

6 MAINTENANCE ................................................. 26

6.1 General .......................................................... 26

6.2 Maintenance schedule .................................. 26

6.3 Spare parts .................................................... 29

6.4 Recommended spares and

consumable items.......................................... 29

6.5 Tools required ................................................ 29

6.6 Fastener torques ........................................... 29

6.7 Renewal clearances ...................................... 30

6.8 Disassembly .................................................. 30

6.9 Examination of parts ...................................... 32

6.10 Assembly ....................................................... 32

7 FAULTS; CAUSES AND REMEDIES ................. 37

8 PARTS LISTS AND DRAWINGS ........................ 39

8.1 LNN and LNNC – grease lubricated, gland
packed and component mechanical seal

option – sizes up to 350 mm discharge ......... 39

8.2 LNN and LNNC – grease lubricated and
gland packed option – sizes greater than

350 mm discharge ......................................... 42

8.3 LNNV sleeve bearing type –
grease lubricated, component mechanical
seal and gland packed option

– sizes up to 350 mm discharge .................... 46

8.4 LNNV sleeve bearing type –
grease lubricated and gland packed option

– sizes greater than 350 mm discharge ........ 49

8.5 General arrangement drawing ....................... 51

9 CERTIFICATION ................................................ 51

10 OTHER RELEVANT DOCUMENTATION

AND MANUALS .................................................. 52

10.1 Supplementary User Instructions .................. 52

10.2 Change notes ................................................ 52

10.3 Additional sources of information .................. 52

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

INDEX

Page

Additional sources (10.3) ......................................... 52

Alignment of shafting (see 4.3, 4.5 and 4.7)

Assembly (6.10) ....................................................... 32

ATEX marking (1.6.4.2) ............................................. 7

CE marking and approvals (1.2) ................................ 4

Certification (9) ........................................................ 51

Change notes (10.2) ................................................ 52

Clearances (see 6.7, Renewal clearances) ............. 30

Commissioning and operation (5) ............................ 20

Compliance, ATEX (1.6.4.1) ...................................... 6

Configurations (3.1) ................................................. 11

Copyright (1.4) ........................................................... 4

Design of major parts (3.3) ...................................... 11

Direction of rotation (5.3) ......................................... 22

Disassembly (6.8) .................................................... 30

Disclaimer (1.3) .......................................................... 4

Dismantling (see 6.8, Disassembly) ........................ 30

Drawings (8)............................................................. 39

Duty conditions (1.5) .................................................. 4

Electrical connections (4.8)...................................... 19

End of product life (2.5) ........................................... 10

Examination of parts (6.9) ........................................ 32

Fastener torques (6.6) ............................................. 29

Faults; causes and remedies (7) ............................. 37

Foundation (4.3) ...................................................... 13

Forces and moments (4.6.2).................................... 16

General arrangement drawing (8.5) ........................ 51

Grouting (4.4) ........................................................... 14

Guarding (5.4) .......................................................... 22

Handling (2.2) .......................................................... 10

Hydraulic, mechanical and electrical duty (5.9) ....... 25

Impeller clearance (6.7) ........................................... 30

Inspection (6.2.1 and 6.2.2) ..................................... 27

Installation (4) .......................................................... 13

Lifting (2.3) ............................................................... 10

Location (4.1) ........................................................... 13

Lubrication (see 5.1.1, 5.2 and 6.2.3)

Lubrication schedule (5.2.4) .................................... 22

Maintenance (6) ....................................................... 26

Maintenance schedule (6.2) .................................... 26

Name nomenclature (3.2) ........................................ 11

Nameplate (1.7.1) ...................................................... 8

Operating limits (3.4.1) ............................................ 12

Ordering spare parts (6.3.1) .................................... 29

Part assemblies (4.2) ............................................... 13

Parts lists (8) ............................................................ 39

Performance (3.4) .................................................... 12

Piping (4.6)............................................................... 15

Pre-commissioning (5.1) .......................................... 20

Protection systems (4.9) .......................................... 20

Pump and impeller data (3.4.2) ............................... 12

Page

Reassembly (see 6.10, Assembly) ...........................32

Receipt and unpacking (2.1) ....................................10

Recommended fill quantities (5.2.3) .........................21

Recommended grease lubricants (5.2.2) .................21

Recommended oil lubricants (5.2.1) ........................21

Recommended spares (6.4) .....................................29

Recycling (2.5) .........................................................10

Replacement parts (see 6.3 and 6.4) .......................29

Running the pump (5.7) ...........................................24

Safety action (1.6.3) ................................................... 5

Safety labels (1.7.2) ................................................... 8

Safety markings (1.6.1) .............................................. 5

Safety, protection systems (see 1.6 and 4.9)

Sectional drawings (8) ..............................................39

Sound level (see 1.9, Noise level) .............................. 9

Sources, additional information (10.3) .....................52

Spare parts (6.3) ......................................................29

Specific machine performance (1.8) .......................... 9

Starting the pump (5.6).............................................23

Stop/start frequency (5.7.6) ......................................24

Stopping and shutdown (5.8) ...................................25

Storage, pump (2.4) .................................................10

Storage, spare parts (6.3.2) .....................................29

Supplementary manuals or information

sources (10) ........................................................52

Thermal expansion (4.5.1) .......................................14

Tools required (6.5) ..................................................29

Torques for fasteners (6.6) .......................................29

Trouble-shooting (see 7) ..........................................37

Vibration (5.7.5) ........................................................24

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

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
and regulations.

These instructions must 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. 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 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.

1.5 Duty conditions

This product has been selected to meet the specifications
of your purchase 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.

Page 4 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

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
the 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 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.

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 fluoro-elastomers
(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 be
avoided.

NEVER APPLY HEAT TO REMOVE IMPELLER
Trapped lubricant or vapor 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 80 °C (175 °F) or

below -5 °C (23 °F) in a restricted zone, or exceed
local regulations, action as above shall be taken.

Page 5 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

HAZARDOUS LIQUIDS

When the pump is handling hazardous liquids care must
be taken to avoid exposure to the liquid by appropriate
sitting of the pump, limiting personnel access 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.

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, 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.

1.6.4 Products used in potentially explosive
atmospheres

Measures are required to:

 Avoiding excessive surface temperature
 Preventing build up of explosive mixtures
 Preventing the generation of sparks
 Preventing leakages
 Maintaining 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
2014/34/EU (previously 94/9/EC which remains valid
until 20 April 2016 during the transition). 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, seal 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 ATEX 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 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.

Page 6 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Temperature class

to EN13463-1

Maximum surface

temperature permitted

Temperature limit of

liquid handled

T6
T5
T4
T3
T2
T1

85 °C (185 °F)

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

65 °C (149 °F) *

80 °C (176 °F) *
115 °C (239 °F) *
180 °C (356 °F) *
275 °C (527 °F) *
400 °C (752 °F) *

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)

b = Control of ignition source

(in accordance with EN13463-6)
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 temperature

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 ATEX
temperature class and must not exceed the values in
the table that follows:

* The table 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.

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

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 when the pump is required to be
used in differently classified potentially explosive
atmospheres. In this case the user is responsible for
ensuring that the pump surface temperature does not
exceed that permitted in its actual installed location.

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

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

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.

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.

1.6.4.4 Preventing the build-up of explosive
mixtures

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.

If the operation of the system cannot avoid this
condition, fit an appropriate dry run protection device
(for 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.

Page 7 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

1.6.4.5 Preventing sparks

To prevent a potential hazard from mechanical

contact, the coupling guard must be non-sparking.

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

Avoid electrostatic charge: do not rub non-metallic

surfaces with a dry cloth; ensure cloth is damp.
For ATEX the coupling must be selected to comply with

the requirements of European Directive 2014/34/EU
(previously 94/9/EC which remains valid until 20 April
2016 during the transition). Correct coupling alignment
must be maintained.

Additional requirement for metallic pumps on non­metallic baseplates

When metallic components are fitted on a non-metallic
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
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, install a liquid detection device

1.6.4.7 Maintenance to avoid the hazard

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 safety labels

1.7.1 Nameplate

For details of nameplate, see the Declaration of
Conformity, or separate documentation included with

these User Instructions.

1.7.2 Safety labels

Oil lubricated units only:

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.

Page 8 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Motor size
and speed

kW (hp)

Typical sound pressure level L

pA

at 1 m reference 20 μPa, dBA

3 550 r/min

2 900 r/min

1 750 r/min

1 450 r/min

Pump

only

Pump and

motor

Pump

only

Pump and

motor

Pump

only

Pump and

motor

Pump

only

Pump and

motor

5.5 (7.5)

76

77

72

75

66

67

64

65

7.5 (10)

76

77

72

75

66

67

64

65

11(15)

80

81

76

78

70

71

68

69

15 (20)

80

81

76

78

70

71

68

69

18.5 (25)

81

81

77

78

71

71

69

71

22 (30)

81

81

77

79

71

71

69

71

30 (40)

83

83

79

81

73

73

71

73

37 (50)

83

83

79

81

73

73

71

73

45 (60)

86

86

82

84

76

76

74

76

55 (75)

86

86

82

84

76

76

74

76

75 (100)

87

87

83

85

77

77

75

77

90 (120)

87

88

83

85

77

78

75

78

110 (150)

89

90

85

87

79

80

77

80

150 (200)

89

90

85

87

79

80

77

80

200 (270)

  



85

87

83

85

300 (400)

–

87

90

85

86

500 (670)

88  86



1 000 (1 300)

90  88



1 500 (2 000)

90  90



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

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.

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 17 dBA to the sound pressure value.

 The noise level of machines in this range will most likely be of values which require noise exposure control, but typical values are inappropriate.
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.

Page 9 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

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
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.

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

Unit must not be moved as an

assembled unit.

A crane must be used for all pump sets and
components in excess of 25 kg (55 lb). Fully trained
personnel must carry out lifting, in accordance with
local regulations.

To avoid distortion, the pump unit

should be lifted as shown.
Before lifting the driver alone, refer to the

manufacturer’s instructions.

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
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.

Page 10 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

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 Configurations

The LNN type pump is a single stage, double suction,
horizontal split volute type centrifugal pump designed
for water works, drainage, general service and
circulating applications. It can be used with motor,
steam turbine and gasoline or diesel engine drives.

The LNN can have the following configurations:

LNN horizontal suction and discharge nozzles (inline)

LNNC bottom vertical suction, horizontal discharge

LNNV horizontal suction/discharge, vertical shaft (inline)

There is also an advanced design designated LNNA.

3.2 Name nomenclature

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

400-LNNA-875-AA

Nominal discharge branch size
Configuration – see 3.1 above
Nominal maximum impeller diameter

Impeller hydraulic type *
Casing hydraulic type *

(* Normally the hydraulic type will appear on the
performance curve.)

The typical nomenclature above is the general guide
to the LNN 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 top half casing. Suction and discharge
branches are in the bottom half and therefore remain
undisturbed.

3.3.2 Impeller

The impeller is fully shrouded and may be fitted with
optional hub rings.

3.3.3 Shaft

The large diameter stiff shaft, mounted on bearings,
has a keyed drive end.

3.3.4 Pump bearings and lubrication

Ball bearings are fitted as standard and may be either
oil or grease lubricated, protected by V-ring seals.

Oil lubrication is only available where the pump shaft
is horizontal.

Bearing isolators or stationary labyrinths may be
fitted as an option in the bearing covers to protect the
bearings.

The LNNV as standard has a liquid lubricated journal
bearing fitted at the non-drive end. This bearing is
lubricated by pumped product or from an external
clean source. A grease lubricated ball bearing option
may be fitted at the non-drive end.

Page 11 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Pumped liquid temperature limits

-20 to +80 ºC
(-4 to +176 ºF)

High temperature liquid limits *

-20 to +130 ºC
(-4 to +266 ºF)

Maximum ambient temperature

-20 to +40 ºC
(-4 to +104 ºF)

Maximum soft solids in suspension *

up to 3 % by volume
(refer for size limits)

Maximum pump speed

refer to the nameplate

Pump size

Hydraulic

Impeller

type

Impeller

minimum

passage size

mm (in.)

Nominal

wear ring

diameter

mm (in.)

Mean radial

wear ring

clearance

mm (in.)

200LNN300

A

22.4 (0.90)

215 (8.5)

0.3 (0.012)

200LNN325

24.3 (0.96)

240 (9.5)

200LNN375

A and B

25.5 (1.00)

215 (8.5)

200LNN400

29.6 (1.20)

240 (9.5)

200LNN475

24.0 (0.95)

200LNN500

17.5 (0.70)

215 (8.5)

200LNN525

A

30,0 (1.20)

240 (9.5)

200LNN600

A and B

16.0 (0.63)

250LNN325

D

30.1 (1.20)

250LNN375

A and B

27.8 (1.10)

264 (10.4)

250LNN475

32.5 (1.30)

250LNN600

22.0 (0.87)

250LNN650

32.0 (1.26)

330 (13.0)

300LNN325

A

20.0 (0.78)

300 (11.8)

300LNN450

30 (1.20)

300LNN475

A and B

36.3 (1.40)

330 (13.0)

300LNN500

36.8 (1.40)

300 (11.8)

300LNN575

42.9 (1.70)

350 (13.8)

300LNN600

30.0 (1.20)

300 (11.8)

300LNN625

25.0 (1.00)

330 (13.0)

300LNN750

27.9 (1.10)

350LNN375

A

25.0 (0.94)

350LNN475

A and B

45.4 (1.80)

380 (15.0)

350LNN575

41.2 (1.60)

350LNN725

48.0 (1.90)

350LNN900

33.0 (1.30)

400LNN600

A

46 (1.80)

420 (16.5)

400LNN600

D

45 (1.77)

400LNN725

A

53.3 (2.10)

400LNN725

B

45 (1.77)

400LNN800

A

50 (1.97)

470 (18.5)

400LNNA875

40 (1.57)

440 (17.3)

0.34 (0.013)

400LNN900

45.7 (1.80)

400LNN925

F

50 (1.97)

496 (19.5)

0.3 (0.012)

500LNN600

A

60 (2.36)

440 (17.3)

500LNN650

61 (2.40)

470 (18.5)

500LNN650

B

55 (2.16)

500LNN650

C

61 (2.4)

500LNN700

A

48.3 (1.90)

440 (17.3)

500LNN775

53.3 (2.10)

500 (19.7)

0.34 (0.013)

500LNN775

B

49 (1.93)

500LNN775

C

50 (1.97)

500LNN950

A

63.5 (2.50)

500LNN1000

45 (1.77)

500LNN1150

40.6 (1.60)

500LNN1250

37 (1.45)

600LNN750

80 (31.5)

564 (22.2)

0.45 (0.018)

600LNN750

B

70 (2.75)

600LNN950

A and C

68.6 (2.70)

620 (24.4)

600LNN975

A

71.1 (2.80)

564 (22.2)

600LNN975

B

60 (2.36)

600LNN1200

A

61 (2.40)

582 (22.9)

600LNN1200

B

50 (1.97)

600LNN1200

C

55 (2.16)

700LNN1225

A

88.9 (3.50)

700 (27.6)

700LNN1225

B

70 (2.75)

700LNN1225

D

60 (2.36)

900LNN1200

A

100 (3.94)

866 (34.1)

1000LNN750

A

85 (3.35)

658 (25.9)

0.55 (0.022)

1000LNN750

C

90 (3.54)

1000LNN800

A

80 (3.15)

0.5 (0.197)

3.3.5 Bearing housing

Two grease nipples enable grease lubricated
bearings to be replenished between major service
intervals. For oil lubricated bearings, a constant level
oiler is fitted.

3.3.6 Stuffing box housing

The stuffing box housing has a spigot (rabbet) fit
between the pump casing and bearing housing 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.

3.3.8 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.

3.3.9 Accessories

Accessories may be fitted when specified by the
customer.

3.4 Performance and operating limits

This product has been selected to meet the
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

3.4.2 Pump and impeller data

* Subject to written agreement from Flowserve.

Page 12 of 56 flowserve.com

typically 50 to 65% of those for the standard metallic rings shown

Clearances for non-metallic wear rings are smaller,

above.

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

3.4.3 Energy efficient operation of pumps

The pump supplied will have been selected from

Flowserve’s extensive product line to have optimum

efficiency for the application. If supplied with an electric
motor then the motor will meet or exceed current
legislation for motor efficiency. However it is the way
the pump is operated which has the greatest impact on
the amount and cost of energy used during the
operating life of the pump. The following are key points
in achieving minimum operating cost for the equipment:
 Design the pipe system for minimum friction

losses

 Ensure that the control system switches off the

pump when not required

 In a multi-pump system run the minimum number

of pumps

 Try to avoid systems which by-pass excess flow
 Avoid as far as possible controlling pump flow by

throttle valves

 When commissioned, check that the pump

operates at the duty specified to Flowserve

 If it has been found that the pump head and flow

exceed that required, trim the pump impeller
diameter

 Ensure that the pump is operating with sufficient

NPSH available

 Use variable speed drives for systems which

require variable flow. A VFD for an induction
motor is a particularly effective way of achieving
speed variation and energy/cost reduction

 Notes for VFD usage:

o Make sure that the motor is compatible with VFD
o Do not over-speed the pump without checking

the power capability with Flowserve

o On systems with high static head, speed

reduction is limited. Avoid running the pump at
a speed which gives low or zero flow

o Do not run at a low speed and flow rate which

lets solids settle out of suspension in the pipe
work

o Do not use a VFD for a fixed flow requirement;

it will introduce power losses

 Select high efficiency motors
 If replacing a standard motor with a high efficiency

motor it will run faster and the pump could take
more power. Reduce the impeller diameter to
achieve energy reduction

 If the pump system pipe work or equipment is

changed or process duty is changed, check that
the pump is still correctly sized

 Periodically check that the pipe system has not

become corroded or blocked

 Periodically check that the pump is operating at

the flow, head and power expected and that the
efficiency has not reduced with erosion or
corrosion damage

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

Motors may be supplied loose on LNNV pumps,
typically on motor frame sizes 400 and above. It is
the responsibility of the installer to ensure that the
motor is assembled to the pump and lined up as
detailed in section 4.5.2, Alignment methods.

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:

a) The baseplate 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.)

b) Install the baseplate onto packing pieces evenly

spaced and adjacent to foundation bolts.

c) Level with shims between baseplate and packing

pieces.

Page 13 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Pa ra lle l

An gu lar

d) The pump and driver have been aligned before

dispatch however the alignment of pump and motor
half coupling must be checked. If this is incorrect, it
indicates that the baseplate has become twisted
and should be corrected by re-shimming.

e) Vertical pumps should be mounted following the

practices outlined for baseplate mounted pumps.
(Larger sizes may need the motor fitting after
installing the pump - refer to section 4.5.2.)

f) If the pump is driven via a universal joint drive

shaft there may be a requirement to offset the
pump shaft with respect to the driver to optimize
the universal joint drive shaft bearing life. This
offset will typically be in the range 0 to 4 degrees
depending on shaft design. Please consult the
separate User Instructions before installation.

g) Any support for the universal joint drive shaft

plummer blocks must not exhibit resonant
frequencies in the range 0.8 to 1.2 N where
N = pump running speed.

h) If not supplied, guarding shall be fitted as

necessary to meet the requirements of ISO
12100 and EN953 and or any applicable local
safety regulations.

4.4 Grouting

Where applicable, grout in the foundation bolts.
After adding pipe work connections and rechecking the

coupling alignment, the baseplate should then be
grouted in accordance with good engineering practice.
Fabricated steel, cast iron and epoxy baseplates can be
filled with grout. Folded steel baseplates should be
grouted to locate their packing pieces. 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 pump and motor will normally

have to be aligned at ambient temperature and
should be corrected to allow for thermal expansion at
operating temperature. In pump installations
involving high liquid temperatures, the unit should be
run at the actual operating temperature, shut down
and the alignment checked immediately.

4.5.2 Alignment methods

Pump and driver must be isolated

electrically and the half couplings disconnected.

The alignment MUST be checked.
Although the pump will have been aligned at the
factory it is most likely that this alignment will have
been disturbed during transportation or handling. If
necessary, align the motor to the pump, not the pump
to the motor.

Horizontal pumps – LNN and LNNC

Alignment is achieved by adding or removing shims
under the motor feet and also moving the motor
horizontally as required. In some cases where the
alignment cannot be achieved it will be necessary to
move the pump before recommencing the above
procedure. Alignment can be achieved by use of the
motor adjusters if fitted.

Vertical pumps – LNNV

Adding or removing shims between the motor stool and
the pump casing achieves alignment. The motor/motor
stool assembly may also have to be moved horizontally
at the interface with the pump casing, as required.

On the frame mounted pumps angular alignment is
achieved by adding correctly sized shims to between
the motor stool and frame.

It should be noted that if the motor has a spigot (rabbet)
fit into the motor stool then it is not possible to achieve
any horizontal movement at this interface.

For couplings with narrow flanges use a dial indicator
as shown below to check both parallel and angular
alignment. The alignment values are maximums for
continuous service.

Maximum permissible misalignment at working
temperature:

Parallel 0.2 mm (0.008 in.) TIR
Angular 0.1 mm (0.004 in.) TIR

When checking parallel alignment, the total indicator
read-out (TIR) shown is twice the value of the actual
shaft displacement. Align in the vertical plane first,

then horizontally by moving motor.

Page 14 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

While the pump is capable of operating with the
maximum misalignment shown above, maximum pump
reliability is obtained by near perfect alignment of 0.05
to 0.10 mm (0.002 to 0.004 in.) TIR parallel and

0.05 mm (0.002 in.) per 100 mm (4 in.) of coupling
flange diameter as TIR angular misalignment. This
covers the full series of couplings available.

Pumps with thick flanged non-spacer couplings can
be aligned by using a straight-edge across the
outside diameters of the coupling hubs and
measuring the gap between the machined faces
using feeler gauges, measuring wedge or calipers.

When the electric motor has sleeve bearings it is
necessary to ensure that the motor is aligned to run
on its magnetic centerline.

Refer to the motor manual for details.

A button (screwed into one of the shaft ends) is
normally fitted between the motor and pump shaft
ends to fix the axial position.

If the motor does not run in its
magnetic centre the resultant additional axial force
may overload the pump thrust bearing.

4.5.3 Check for soft foot

This is a check to ensure that there is no undue
stress on the driver holding down bolts; due to non­level baseplate or twisting. To check, remove all
shims and clean surfaces and tighten down driver to
the baseplate. Set a dial indicator as shown in the
sketch and loosen off the holding down bolt while
noting any deflection reading on the dial test indicator

- a maximum of 0.05 mm (0.002 in.) is considered
acceptable but any more will have to be corrected by
adding shims. For example, if the dial test indicator
shows the foot lifting 0.15 mm (0.006 in.) then this is
the thickness of shim to be placed under that foot.
Tighten down and repeat the same procedure on all
other feet until all are within tolerance.

Complete piping as below and see sections 4.7,

Final shaft alignment check, up to and including section
5, Commissioning, start up, operation and shutdown,
before connecting driver and checking actual rotation.

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 pipe work

Never use the pump as a support for

piping.
In order to minimize friction losses and hydraulic

noise in the pipe work it is good practice to choose
pipe work that is one or two sizes larger than the
pump suction and discharge. Typically main pipe
work 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.

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, worn couplings,
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.
It is recommended that expansion joints use
threaded rod to limit any forces of this type

The tables in 4.6.2 summarize the maximum forces
and moments allowed on LNN pump casings. Refer
to Flowserve for other configurations.

Ensure piping and fittings are flushed

before use.

Ensure piping for hazardous liquids is arranged

to allow pump flushing before removal of the pump.

Page 15 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Type and size

Maximum forces (F) in kN (lbf) and moments (M) in kNm (lbf•ft)

Suction

Discharge

Fx

Fy

Fz

Mx

My

Mz

Fx

Fy

Fz

Mx

My

Mz

200-LNN-300 to

200-LNN-600

5.34

(1 200)

6.68

(1 500)

4.45

(1 000)

5.02

(3 700)

2.44

(1 800)

3.80

(2 800)

3.78

(850)

4.90

(1 100)

3.12

(700)

3.53

(2 600)

1.76

(1 300)

2.58

(1 900)

250-LNN-325 to

250-LNN-600

6.68

(1 500)

8.01

(1 800)

5.34

(1 200)

6.10

(4 500)

2.98

(2 200)

4.61

(3 400)

5.34

(1 200)

6.68

(1 500)

4.45

(1 000)

5.02

(3 700)

2.44

(1 800)

3.80

(2 800)

300-LNN-325 to

300-LNN-450,
300-LNN-575,

300-LNN-625 and

300-LNN-750

8.46

(1 900)

10.20

(2 290)

6.68

(1 500)

7.32

(5 400)

3.66

(2 700)

5.42

(4 000)

6.68

(1 500)

8.01

(1 800)

5.34

(1 200)

6.10

(4 500)

2.98

(2 200)

4.61

(3 400)

300-LNN-500 and

300-LNN-600

7.12

(1 600)

8.90

(2 000)

5.79

(1 300)

6.37

(4 700)

3.12

(2 300)

4.75

(3 500)

6.68

(1 500)

8.01

(1 800)

5.34

(1 200)

6.10

(4 500)

2.98

(2 200)

4.61

(3 400)

350-LNN-375 to

350-LNN-900

10.70

(2 410)

12.90

(2 900)

8.58

(1 930)

9.12

(6 725)

4.90

(3 615)

6.74

(4 970)

7.12

(1 600)

8.90

(2 000)

5.79

(1 300)

6.37

(4 700)

3.12

(2 300)

4.75

(3 500)

400-LNN-600,

400-LNN-725 and

400-LNN-900

10.32

(2 320)

12.50

(2 810)

8.05

(1 810)

8.71

(6 420)

4.38

(3 230)

6.40

(4 720)

8.45

(1 900)

10.20

(2 290)

6.67

(1 500)

7.32

(5 400)

3.66

(2 700)

5.42

(4 000)

400-LNN-800,

400-LNNA-875 and

400-LNN-925

12.27

(2 760)

14.82

(3 330)

9.47

(2 130)

10.15

(7 490)

5.14

(3 790)

7.40

(5 460)

8.45

(1 900)

10.20

(2 290)

6.67

(1 500)

7.32

(5 400)

3.66

(2 700)

5.42

(4 000)

500-LNN-600 to

500-LNN-1250

12.27

(2 760)

14.82

(3 330)

9.47

(2 130)

10.15

(7 490)

5.14

(3 790)

7.40

(5 460)

10.32

(2 320)

12.50

(2 810)

8.05

(1 810)

8.71

(6 420)

4.38

(3 230)

6.40

(4 720)

600-LNN-750

15.21

(3 420)

18.29

(4 110)

11.60

(2 610)

12.30

(9 070)

6.28

(4 630)

8.90

(6 560)

12.27

(2 760)

14.82

(3 330)

9.47

(2 130)

10.15

(7 490)

5.14

(3 790)

7.40

(5 460)

600-LNN-950

16.19

(3 640)

19.45

(4 370)

12.31

(2 770)

13.01

(9 600)

6.66

(4 910)

9.40

(6 930)

12.27

(2 760)

14.82

(3 330)

9.47

(2 130)

10.15

(7 490)

5.14

(3 790)

7.40

(5 460)

600-LNN-975 and

600-LNN-1200

14.23

(3 200)

17.14

(3 850)

10.89

(2 450)

11.58

(8 540)

5.90

(4 350)

8.40

(6 200)

12.27

(2 760)

14.82

(3 330)

9.47

(2 130)

10.15

(7 490)

5.14

(3 790)

7.40

(5 460)

700-LNN-1100
700-LNN-1300

20.10

(4 519)

24.08

(5 413)

15.15

(3 406)

15.88

(11 712)

8.18

(6 033)

11.40

(8 408)

14.23

(3 199)

17.14

(3 853)

10.89

(2 448)

11.58

(8 541)

5.90

(4 352)

8.40

(6 196)

700-LNN-1225

18.14

(4 080)

21.77

(4 890)

13.73

(3 090)

14.45

(10 660)

7.42

(5 470)

10.40

(7 670)

14.23

(3 200)

17.14

(3 850)

10.89

(2 450)

11.58

(8 540)

5.90

(4 350)

8.40

(6 200)

800-LNN-1125

24.04

(5400)

28.72

(6460)

17.99

(4040)

18.75

(13830)

9.7

(7150)

13.4

(9880)

16.19

(3640)

19.45

(4370)

12.31

(2770)

1301

(9600)

6.66

(4910)

9.4

(6930)

900-LNN-675

18.14

(4080)

21.77

(4890)

13.73

(3090)

14.45

(10660)

7.42

(5470)

10.4

(7670)

18.14

(4080)

21.77

(4890)

13.73

(3090)

14.45

(10660)

7.42

(5470)

10.4

(7670)

900-LNN-1200

24.01

(5 400)

28.72

(6 460)

17.99

(4 040)

18.75

(13 830)

9.70

(7 150)

13.40

(9 880)

18.14

(4 080)

21.77

(4 890)

13.73

(3 090)

14.45

(10 660)

7.42

(5.470)

10.40

(7 670)

1000-LNN-750 and

1000-LNN-800

20.10

(4 520)

24.08

(5 410)

15.15

(3 410)

15.88

(11 710)

8.18

(6 030)

11.40

(8 410)

20.10

(4 520)

24.08

(5 410)

15.15

(3 410)

15.88

(11 710)

8.18

(6 030)

11.40

(8 410)

1000-LNN-825

24.04

(5400)

28.72

(6460)

17.99

(4040)

18.75

(13830)

9.7

(7150)

13.4

(9880)

20.1

(4250)

24.08

(5410)

15.15

(3410)

15.88

(11710)

8.18

(6030)

11.4

(8410)

4.6.2 Maximum forces and moments allowed on pump flanges

4.6.2.1 LNN, LNNV maximum forces and moments allowed

For load and momentum orientation, see following page.
Notes: see end of section 4.6.2.2.

Page 16 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Discharge

Suction

Pump

axis

Type and size

Maximum forces (F) in kN (lbf) and moments (M) in kNm (lbf•ft)

Suction

Discharge

Fx

Fy

Fz

Mx

My

Mz

Fx

Fy

Fz

Mx

My

Mz

300-LNNC-475

and

300-LNNC-575

8.46

(1 900)

10.20

(2 290)

6.68

(1 500)

7.32

(5 380)

3.66

(2 690)

5.42

(3 990)

6.68

(1 500)

8.01

(1 800)

5.34

(1 200)

6.10

(4 490)

2.98

(2 190)

4.61

(3 390)

300-LNNC-500

7.12

(1 600)

8.90

(2 000)

5.79

(1 300)

6.37

(4 690)

3.12

(2 300)

4.75

(3 490)

6.68

(1 500)

8.01

(1 800)

5.34

(1 200)

6.10

(4 490)

2.98

(2 190)

4.61

(3 390)

350-LNNC-475 to

300-LNNC-900

10.70

(2 400)

12.90

(2 890)

8.58

(1 920)

9.12

(6 710)

4.90

(3 600)

6.74

(4 960)

7.12

(1 600)

8.90

(2 000)

5.79

(1 300)

6.37

(4 690)

3.12

(2 300)

4.75

(3 490)

600-LNNC-950

17.10

(3 840)

20.40

(4 580)

14.00

(3 140)

14.20

(10 450)

8.44

(6 210)

10.40

(7 650)

12.90

(2 890)

15.60

(3 500)

10.50

(2 360)

10.90

(8 020)

6.14

(4 520)

8.05

(5 920)

600-LNNC-975

14.90

(3 340)

17.80

(3 990)

12.10

(2 710)

12.40

(9 120)

7.22

(5 310)

9.14

(6 720)

12.90

(2 890)

15.60

(3 500)

10.50

(2 360)

10.90

(8 020)

6.14

(4 520)

8.05

(5 920)

700-LNNC-1225

19.30

(4 330)

23.00

(5 160)

15.90

(3 570)

15.90

(11 700)

9.65

(7 100)

11.70

(8 610)

14.90

(3 340)

17.80

(3 990)

12.10

(2 710)

12.40

(9 120)

7.22

(5 310)

9.14

(6 720)

DISCHARGE

SUCTION

Mx

My

Mz

Fx

Fy

Fz

Mx

My

Mz

Fx

Fy

Fz

PUMP

AXIS

Load and momentum orientation of LNN and
LNNV pumps

4.6.2.2 LNNC maximum forces and moments allowed

Load and momentum orientation of LNNC pumps

Notes:

1) F = External force (tension or compression).

M = External moment, clockwise or counter-clockwise.
Sign convention follows ISO 1503 and ISO 13709/API610.

2) Forces and moments may be applied simultaneously in any

direction.

3) Values apply to all materials.

4) The nozzle loads applied to the pump flanges must not exceed

the values given in tables 4.6.2.1 and 4.6.2.2

5) Higher loads may be applicable, if direction and magnitude of

individual loads are known, but these need written approval
from Flowserve.

6) The pump nozzle is not to be used as a rigid support for the

piping line.

7) The piping loads applied to the pump flanges can be minimized

using the appropriate piping line supports.

8) The suction and discharge piping lines must not be connected

to the pump nozzle with an expansion joint (or similar flexible
pipes), unless they are rigidly blocked with tie rods.

9) Pumps must be on rigid foundations and baseplates must be
fully grouted.

10) Pump/baseplate should not be used as pipe anchor.

11) Suction and discharge piping should be anchored as close as

possible to the pump flanges to reduce vibration and prevent
strain on the pump casing. Expansion joints are
recommended. They must be properly tied and located on the
side of the pipe anchor away from the pump.

12) The pump mounting bolt torques specified must be used to

prevent relative movement between the pump casing and
baseplate. (See section 6.6, Fastener torques.) The bolt
material must have a minimum yield strength of 600 N/mm2
(87 000 lb/in.2).

Failure to complying with the above can result in
damage to the pump.

Page 17 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Disch arge
is olati ng
valve

No n
re turn
valve

Conce ntric
conic al
re ducer

Eccentr ic
conic al
re ducer

Suctio n
is olati ng
valve

Sl ope up from
pump s uct ion

L o n g
r ad i u s
b e n d

S l o p e d o w n
f r o m p u m p
s u c t i o n

>5 D

E c c en t r i c
c on i c a l
r ed u c e r

D i s c h a r g e
i s o l a t i n g
v a l v e

C on c e n t r i c
c on i c a l
r ed u c e r

N on
r et u r n
v a l v e

4.6.3 Suction piping

Refer to the diagrams below for typical designs of
suction piping for both flooded suction and suction lift.
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) Pipe work reducers should be conical and have a

maximum total angle of divergence of 15 degrees.

c) On suction lift the piping should be inclined up

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

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

constant fall towards the pump.

e) Flow should enter the pump suction with uniform

flow, to minimize noise and wear. This is
particularly important on large or high-speed
pumps which should have a minimum of five
diameters of straight pipe on the pump suction
between the elbow and inlet flange. See section

10.3, Reference 1, for more detail.

f) Do not install elbows at an angle other than

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

Typical design – flooded suction

g) Except in unusual circumstances strainers are

not recommended in inlet piping. If considerable
foreign matter is expected a screen installed at
the entrance to the wet well is preferable.

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

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

i) Fitting an isolation valve will allow easier

maintenance.

j) Never throttle pump on suction side and never

place a valve directly on the pump inlet nozzle.

4.6.3.1 Suction strainer

In a new installation, great care should be taken to
prevent dirt, scale, welding beads and other items
from entering the pump, as it is particularly important
to protect the numerous close running fits from
abrasive matter present in new piping

The suction system should be thoroughly flushed
before installing the suction strainer and making up
suction piping to the pump. The suction strainer
should be installed between 5 to 20 pipe diameters
upstream from the pump suction flange.

The open area of the strainer should

have a minimum of a 3 to 1 ratio to the area of the
pump suction.

Note:

Ideally reducers should be limited to one pipe diameter change,
ie 150 mm (6 in.) to 200 mm (8 in.). Must have a maximum total
angle of divergence of 15 degrees.

Typical design – suction lift

Notes:

1. S = Minimum submergence >3E.

2. Ideally reducers to be limited to one pipe diameter change,
ie 150 mm (6 in.) to 200 mm (8 in.). Must have a maximum total
angle of divergence of 15 degrees.

The Flowserve recommendation for suction strainers
consists of a conical shaped steel plate. The plate has

1.6 mm (1/16 in.) perforations and is of sufficient size and
thickness for the required flow. (See figure above.)

Other type of strainers may be used as long as they
conform to the requirements stated above.

Pressure gauges should be installed on both sides of
the screen so that the pressure drop across the
screen can be measured.

When the unit is being started, the gauges on each
side of the screen should be carefully watched. An
increase in the differential pressure between the two
gauges indicates that the screen is becoming clogged
with dirt and scale. At this point, the pump should be
shut down, and the screen cleaned and/or replaced.

The strainer must be removed after the initial run-in
time if the process does not allow its permanent use.

Cone type strainer

Page 18 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

A spool piece should be installed in the

suction line so that the suction strainer may be
installed and removed with a pressure gauge
between the strainer and pump.

4.6.4 Discharge piping

See section 4.6.3 for typical pipe work design.

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

Pipe work 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.

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 pipe work. Check also the tightness of all
foundation bolts.

4.7 Final shaft alignment check

After connecting piping to the pump, rotate the shaft
several times by hand to ensure there is no binding
and all parts are free.

Recheck the coupling alignment, as previously
described, to ensure no pipe strain. If pipe strain
exists, correct piping.

4.8 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

If the pumped liquid is dirty and cannot be used for
sealing, a separate clean compatible liquid supply to
the gland at 1 bar (15 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 pressure steam or static pressure from
a header tank. Recommended pressure is 0.35 bar
(5 psi) or less. Check General arrangement drawing.

Page 19 of 56 flowserve.com

the equipment, wiring or any connected devices. If in
any doubt contact Flowserve for advice.

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. Check the identification
nameplate to ensure the power supply is appropriate.

A device to provide emergency stopping must

be fitted.
If not supplied pre-wired to the pump unit, the

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

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

For electrical details on pump sets with controllers
see the separate wiring diagram.

See section 5.3, Direction of rotation,

before connecting the motor to the electrical supply.

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.)

If a defect of cooling can lead to temperature higher
than those acceptable a system of cooling
surveillance must be installed.

Except when explicitly required by the customer in
the specifications, when a possibility of reverse
rotation exists the customer must install a reverse
rotation protection device.

The customer must install all equipment required to
avoid water hammer.

5 COMMISSIONING, START-UP,

OPERATION AND SHUTDOWN

These operations must be carried

out by fully qualified personnel.

5.1 Pre-commissioning procedure

5.1.1 Lubrication

Determine the mode of lubrication of the pump set,
eg grease, oil, product lubrication etc.

For oil lubricated pumps, fill the bearing

housing with correct grade of oil to the correct level, ie

sight glass or constant level oiler bottle.

When fitted with a constant level oiler, the bearing
housing should be filled by unscrewing or hinging back
the transparent bottle and filling the bottle with oil.
Where an adjustable body Denco oiler is fitted this should
be set to the height shown in the following diagram:

The oil filled bottle should then be refitted so as to
return it to the upright position. Filling should be
repeated until oil remains visible within the bottle.

Approximate oil volumes are shown in section 5.2.4,

Recommended fill quantities.

Pumps with grease lubricated antifriction bearings are
normally supplied fitted with grease nipples and with
pre-greased bearings.

Grease lubricated electric motor bearings are generally
pre-greased. Refer to the motor UI for information on
the motor lubrication schedule. Other drivers and
gearboxes, if appropriate, should be lubricated in
accordance with their manuals.

In the case of product lubricated bearings
check the source of product supply against the order.
There may be a requirement for an external clean supply,
a particular supply pressure or the commencement of
lubrication supply before pump start-up.

Page 20 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Grease

grade

NLGI 3 **

NLGI 2 *

NLGI 2 *

Temperature

range

-20 to 100 ºC
(-4 to 212 ºF)

-20 to 100 ºC
(-4 to 212 ºF)

-20 to 130 ºC
(-4 to 266 ºF)

Designation

acc. to DIN

KP3K-20

KP2K-25

KP2N-20

BP

Energrease

LS-EP3

Energrease

LS-EP2

Elf

Multis EP3

Multis EP2

Fuchs

RENOLIT

EP3

RENOLIT

EP2

Esso

Beacon EP3

Beacon EP2

Mobil

Mobilux EP3

Mobilux EP2

Q8

Rembrandt

EP3

Rembrandt

EP2

Shell

Alvania EP3

Alvania EP2

Texaco

Multifak EP3

Multifak EP2

SKF

LGEP 2

LGHB 2 ***

Centrifugal

pump lubrication

Oil

Splash / force feed / purge and pure **oil mist lubrication

Viscosity cSt @ 40 ºC

32

46

68

Oil temperature range *

-5 to 65 ºC

(23 to 149 ºF)

-5 to 78 ºC

(23 to 172 ºF)

-5 to 80 ºC

(23 to 176 ºF)

Designation to ISO 3448
and DIN51524 part 2

ISO VG 32

32 HLP

ISO VG 46

46 HLP

ISO VG 68

68 HLP

Oil companies and lubricants

BP Castrol †

Energol HLP-HM 32

Energol HLP-HM 46

Energol HLP-HM 68

ESSO †

NUTO HP 32

NUTO HP 46

NUTO HP 68

ELF/Total †

ELFOLNA DS 32

Azolla ZS 32

ELFOLNA DS 46

Azolla ZS 46

ELFOLNA DS 68

Azolla ZS 68

LSC
(for oil mist only – long life) †

LSO 32

(synthetic oil)

LSO 46

(synthetic oil)

LSO 68

(synthetic oil)

ExxonMobil (mineral oil) †

Mobil DTE 24

Mobil DTE 25

Mobil DTE 26

ExxonMobil
(oil bath only – long life) †

Mobil SHC524

(synthetic oil) ***

Mobil SHC525

(synthetic oil)

Mobil SHC526

(synthetic oil)

Q8 †

Q8 Haydn 32

Q8 Haydn 46

Q8 Haydn 68

Shell †

Shell Tellus 32

Shell Tellus 46

Shell Tellus 68

Chevron Texaco †

Rando HD 32

Rando HD 46

Rando HD 68

Wintershall (BASF Group) †

Wiolan HS32

Wiolan HS46

Wiolan HS68

Fuchs †

Renolin CL 32

Renolin CL 46

Renolin CL 68

5.2 Pump lubricants

5.2.1 Recommended oil lubricants

* 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).

** If preheated pure oil mist lubrication, LCS LSO 68 or LSO 100 synthetic oils are permitted.

†

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.

*** ExxonMobil SHC 524 synthetic oil has a pour point temperature of - 54 ºC. This oil can be used for ambient temperature as low as -50 ºC.

5.2.2 Recommended grease lubricants

5.2.3 Lubrication schedule

5.2.3.1 Oil lubricated bearings

Normal oil change intervals are 4 000 operating hours
or at least every 6 months. Where Mobil SHC oils are
used this will increase up to 12 0 00 operating hours
where oil is kept below 60 ºC (140 ºF). For pumps on
hot service or in severely damp or corrosive
atmosphere, the oil will require changing more
frequently. Lubricant and bearing temperature analysis
can be useful in optimizing lubricant change intervals.

The lubricating oil should be a high quality mineral oil
having foam inhibitors. Synthetic oils may also be
used if checks show that the rubber oil seals will not
be adversely affected.

* NLGI 2 is an alternative grease and must not be mixed with other

grades.

** Standard pre-packed grease for fitted antifriction bearings. NLGI 3

greases are preferred for pumps with vertically mounted shaft.

*** Grease to be used on special high temperature applications in

conjunction with a specially selected bearing type and arrangement.

The bearing outer ring temperature may be allowed to
rise to 50 ºC (90 ºF).above ambient, but should not
exceed 93 ºC (200 ºF). If the oil temperature is
monitored then it shall not exceed 82 °C (180 °F).
A continuously rising temperature or an abrupt rise in
temperature will indicate a fault.

Page 21 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Size

(LNN,
LNNV

and LNNC)

Top-up grease

g (oz)

Approx. oil

capacity,

both bearings

litre (fl. oz.)

Single row

ball bearing

Angular contact

thrust bearing

double

200-LNN-300
200-LNN-325
200-LNN-375

8 (0.28)

16 (0.56)

0.37 (12.5)

200-LNN-400
200-LNN-475
200-LNN-500
250-LNN-325
250-LNN-375
300-LNN-325

12 (0.42)

24 (0.84)

0.48 (16.2)

200-LNN-525
200-LNN-600
250-LNN-475
250-LNN-600
300-LNN-475
300-LNN-450
300-LNN-500
300-LNN-575
350-LNN-375

15 (0.53)

30 (1.06)

0.60 (20.3)

250-LNN-650
300-LNN-600
300-LNN-625
350-LNN-475
350-LNN-575
350-LNN-725
400-LNN-600

21 (0.74)

42 (1.48)

0.68 (23.0)

300-LNN-750
350-LNN-900
400-LNN-725
500-LNN-600
500-LNN-650
500-LNN-700
500-LNN-775
900-LNN-675

1000-LNN-750

34 (1.2)

68 (2.4)

2.00 (67.6)

400-LNN-800
400-LNN-875
400-LNN-900
400-LNN-925
500-LNN-950
600-LNN-750
600-LNN-950

600-LNN-975
1000-LNN-800
1000-LNN-825

46 (1.63)

92 (3.26)

4.50 (152)

500-LNN-1150
500-LNN-1250
600-LNN-1200
700-LNN-1100
700-LNN-1225
800-LNN-1125
900-LNN-1200

70 (2.48)

140 (4.96)

7.00 (237)

500-LNN-1000

81 (2.86)

162 (5.72)

4.50 (152)

5.2.3.2 Grease lubricated bearings

When grease nipples are fitted, one charge between
grease changes is advisable for most operating
conditions, i.e. 2 000 hours interval.

Normal intervals between grease changes are 4 000
hours or at least every 6 months.

The characteristics of the installation and severity of
service will determine the frequency of lubrication.
Lubricant and bearing temperature analysis can be
useful in optimizing lubricant change intervals. The
bearing temperature may be allowed to rise to
55 ºC (99 ºF) above ambient but should not exceed
95 C (204 F).

Special high temperature bearing arrangements
above 95 C (204 F) should be checked against the
order.

For most operating conditions quality grease having a
lithium soap base and NLGI consistency of No 2 or
No 3 is recommended. The drop point should
exceed 175 ºC (350 ºF).

Never mix greases containing different

bases, thickeners or additives.

5.3 Direction of rotation

5.2.4 Recommended fill quantities

Ensure the pump is given the same

rotation as the pump direction arrow cast on the
pump casing.

To avoid dry running the pump must either be filled
with liquid or have the flexible coupling disconnected
before driver is switched on.

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.

5.4 Guarding

Guarding is supplied fitted to the pump set.

In member countries of the EU and EFTA, it is a legal
requirement that fasteners for guards must remain
captive in the guard to comply with the Machinery
Directive 2006/42/EC. When releasing such guards,
the fasteners must be unscrewed in an appropriate
way to ensure that the fasteners remain captive.

Whenever guarding is removed or disturbed ensure

amount of oil mist supplied (m³/h) is normally
calculated to be at least the bearing bore diameter
(mm) x the number of bearing rows / 25. The oil mist
should consist of at least 0.025 - 0.04 % oil content.
Where oil mist is utilized to lubricate bearings the
pressure in the bearing housing must not exceed

0.01 bar (0.15 psi).

that all the protective guards are securely refitted
prior to start-up.

Page 22 of 56 flowserve.com

Where the pump is lubricated by oil mist the

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

( 1 ) P o s s i b l e

p r i m i n g

p o i n t s

Possible

priming

points

To vacuum
pump

+ P

- P

(1) Possible

priming

points

5.5 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.

5.5.1 Suction pressure above atmospheric
pressure

Horizontal pumps: open vent connection (1) on top of
the pump upper casing to allow the trapped air to
escape. Let liquid run out until free from air bubbles.

Vertical pumps: open vent connection (1) at the front
of the upper half casing and disconnect 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.

5.5.2 Suction lift with foot valve fitted

Fill suction pipe and casing with liquid at a pressure
of 1 to 2 bar from an external source. Vent as
described in section 5.5.1.

5.5.3 Suction lift without foot valve

Pump casing vents on the suction volute must be
connected to an external vacuum pump priming
system. If in doubt please consult Flowserve.

5.6 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.

5.7 Running the pump

5.7.1 Venting the pump

Vent the pump 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.

5.7.2 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 pressurized.

The gland must be adjusted evenly to give
visible leakage and concentric alignment of the gland
ring [4131] to avoid excess temperature.

Page 23 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Vibration velocity – unfiltered r.m.s.

mm/s (in./sec)

Normal N

 5.6 (0.22)

Alarm N x 1.25

 7.1 (0.28)

Shutdown trip N x 1.7

 9.5 (0.37)

Displacement - unfiltered

Radial

displacement

µm (in.)

Axial

displacement

µm (in.)

Normal N

 50 (0.002)

 200 (0.008)

Alarm N x1.5

 75 (0.03)

 250 (0.010)

Shutdown trip N x 2.0

 100 (0.04)

 300 (0.012)

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 re-started, 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.

5.7.3 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.

5.7.4 Bearings

If the pumps are working in a potentially
explosive atmosphere, temperature or vibration
monitoring at the 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

 Special high temperature bearing arrangement

alarm and shutoff points must be checked
against the order

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 should then remain constant or
marginally reduce with time. (Refer to section 6.2.3.2
for further information.)

5.7.5 Normal vibration levels, alarm and trip

For guidance, pumps generally fall under a
classification for rigid support machines within the
International rotating machinery standards 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 site on the bearing housings of the
pump in the fully commissioned as new condition.

The example (N) value is given for the preferred
operating flow region (typically this may extend to 70
to 120 % of the pump best efficiency point); outside
the preferred flow region the actual vibration
experienced may be multiplied by up to two.These
standard values can vary with the rotational speed and
the power absorbed by the pump. For any special
case, contact your nearest Flowserve office.

Measuring vibration at regular intervals will show any
deterioration in pump or system operating conditions.

5.7.5.1 Vibration measured on the bearing housing

5.7.5.2 Proximity probes displacement values
(for sleeve bearing only)

5.7.6 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.

Page 24 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Motor rating kW (hp)

Maximum stop/starts per hour

Up to 15 (20)

15

Between 15 (20) and 90 (120)

10

90 (120) to 150 (200)

6

Above 150 (200)

Refer

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

5.8 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 pump and Isolate the motor.
c) Switch off flushing and/or cooling/heating liquid

supplies at a time appropriate to the process. If the

pump is used on a water application keep it filled

with water otherwise drain the pump completely.
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.
e) If the pump is left to stand for an extended period

the pump shaft needs to be turned manually one

and one quarter (1 ¼) revolutions every week.

5.8.1 Flushing requirement

The hydraulic and or mechanical performance of pumps
exposed to water containing more than 500 ppm of
chloride can degrade due to accelerated corrosion
effects. In order to minimize these effects, Flowserve
recommend that the end user takes the following
precautions:
a) If the pump is going to be idle for 48 hours or

more, the suction and discharge valves on the

pump must be closed to isolate the pump

internals from the liquid pumped.
b) Open the casing drain connection (located on the

bottom of the lower half casing) to drain all the

water containing the chloride element from the

inside of the pump.
c) Close the casing drain connection and open the

casing fill connection (on the upper half of the

casing) to allow the casing to be filled with fresh

water containing no more than 50 ppm of

chloride.
d) Once the casing is full of fresh water, partially

close the drain connection while the fill

connection remains connected to the source of

fresh water. The casing must then be flushed for

a period of 1 hour.
e) Once flushing is completed, the drain connection

and fill connection must remain open. The inside

of the pump will be open to the atmosphere.

f) If the pump remains idle for 30 days or more, the

pump rotor must be turned.

g) When the pump is placed back into service, follow

the normal startup procedure. Take care not to
operate the pump with the suction valve closed.

5.8.1.1 Flushing limitations

The system designer and or the end user must
advise Flowserve of any chemical treatment that will
be added to the water.

If this process is not followed, the warranty terms of
the contract will be voided.

5.9 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.

5.9.1 Specific gravity (SG)

Pump capacity and total head in meters (ft) 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.

5.9.2 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.

5.9.3 Pump speed

Changing pump speed effects flow, total head, power
absorbed, NPSHR, noise and vibration. 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,
NPSHA > NPSHR, and that noise and vibration are
within local requirements and regulations.

Page 25 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

5.9.4 Net positive suction head (NPSHA)

NPSH available (NPSHA) is a measure of the head
available in the pumped liquid, above its vapor
pressure, at the pump suction branch.

NPSH required (NPSHR) is a measure of the head
required in the pumped liquid, above its vapor
pressure, to prevent the pump from cavitating. It is
important that NPSHA > NPSHR. The margin between
NPSHA > NPSHR should be as large as possible.

If any change in NPSHA is proposed, ensure these
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.

5.9.5 Pumped flow

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

6 MAINTENANCE

6.1 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.)

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.

Guard fasteners must remain captive during
dismantling of guards as described in section 5.4.
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 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.

6.2 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) The pump must be completely vented and

drained and rendered inert before any
disassembly operation.

b) Any auxiliary systems installed must be monitored,

if necessary, to ensure they function correctly.

c) During cleaning of the pump ensure the

compatibility between the cleaning products and

the gaskets.
d) Verify the condition of the gaskets.
e) Gland packing must be adjusted correctly to give

visible leakage and concentric alignment of the

gland follower to prevent excessive temperature

of the packing or follower. Mechanical seals

should present no leakage.
f) Check for any leaks from gaskets and seals. The

correct functioning of the shaft seal must be

checked regularly.
g) Check bearing lubricant level, and if the hours

run show a lubricant change is required.
h) Check that the duty condition is in the safe

operating range for the pump.
i) Check vibration, noise level and surface

temperature at the bearings to confirm satisfactory

operation.

Page 26 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

j) Check the tightness of the connections.
k) Check dirt and dust is removed from areas around

close clearances, bearing housings and motors.
l) Check coupling alignment and re-align if necessary.
m) Verify the correct operation of the system.

The equipment used for maintenance and
disassembly in an ATEX zone must be in conformity
with the requirements zone.

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.

6.2.1 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) Check the level and condition of oil lubricant.

On grease lubricated pumps, check running
hours since last recharge of grease or complete
grease change.

e) Check any auxiliary supplies eg heating/cooling,

if fitted, are functioning correctly.

6.2.3 Re-lubrication

Lubricant and bearing temperature analysis can be
useful in optimizing lubricant change intervals. In
general, however, the following is recommended.

6.2.3.1 Oil lubrication

Maintaining the correct oil level is very

important.
If the pump is supplied with a constant level oiler the oil

level will be automatically maintained and as long as oil
is visible in the glass bottle there is no need to refill. If
however a sight glass has been fitted then regular
checks should be made to ensure the level is
maintained at the centre of the glass window.

Refer to section 5.1.1 for methods of oil fill, section

5.2.1 for oil grade recommendations and 5.2.4 for the
schedule and temperature limits.

6.2.3.2 Grease lubrication

See section 5.2.2 for grease

recommendations.
Regrease - via grease nipples every 2 000 hours or

sooner depending on the severity of the application.
a) It is important not to under or over grease the

bearings as this will lead to overheating and
premature failure. Grease lubricated bearing
housings have grease nipples fitted in the
bearing covers.

b) Move the axial seal ring back so the gap between

the pump shaft and bearing cover can be seen.

f) Refer to the manuals of any associated

equipment for routine checks needed.

6.2.2 Periodic inspection (six monthly)

a) Check foundation bolts for security

of attachment and corrosion.

b) Check pump running records for hourly usage to

determine if bearing lubricant requires changing.

c) The coupling should be checked for correct

alignment and worn driving elements.

d) Refer to the manuals of any associated

equipment for periodic checks needed.

Page 27 of 56 flowserve.com

c) Connect grease gun to the nipple.

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

TIME

TEMPERATURE

d) Press grease into the bearing housing until the

first signs of it appear in the gap between the
housing and shaft, then stop greasing.

e) V-rings should be seated at the proper distance

from the sealing surface to avoid overheating.

f) The maximum allowable operating temperatures

for anti-friction bearings will vary from unit to unit,
depending on ambient and fluid temperature.
The rise above ambient should not normally
exceed 55 C (99 F) or a combined maximum of
95 C (204 F).

g) A continuously rising temperature or an abrupt

temperature rise indicates a problem. If these
symptoms occur, stop the pump immediately and
investigate the cause.

Grease change - every 4 000 hours or sooner
depending on the severity of the application.
a) Remove the bearing housing from the rotor

assembly.

b) Brush the bearing housing with hot kerosene (100

to 115 °C/212 to 240 °F) or other non-toxic solvent.

c) Clean and flush out the housing with a light

mineral oil.

d) Do not use waste oil to clean the housing.

To clean the bearings:

a) Wipe off as much grease as possible with a clean

lint-free cloth.

b) Brush bearings with hot kerosene (80 to 90 °C/ 175 to

195 °F) while gently spinning the outer bearing ring.

c) Spin each ball to ensure that it is clean.

To remove badly oxidized grease that refuses to
come off:

a) Support the rotor in a vertical position and

immerse the bearing in hot kerosene or a mixture
of alcohol and light mineral solvent.

b) Gently spin the bearing outer ring.

c) Dry and reflush the bearing with clean light oil.
d) It is important not to under or over grease the

bearings as this will lead to overheating and
premature failure. It is recommended that the
bearings be filled with grease using a suitable
spatula. In addition the housings should be no
more than half filled.

6.2.4 Mechanical seals

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

6.2.5 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 pressurized flush to the
centre of the packing. If not required, this can be
replaced by an extra two 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.

6.2.6 Internal coating

If the pump has an internal coating, this coating must
be inspected periodically. Any wear or cracks of the
coating found must be immediately repaired. Failure
to do this may lead to accelerated wear of the coating
during operation and corrosion of the exposed base
metal, depending on the material and pumped liquid.
Special attention must be paid to the coating edges.

Page 28 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Torque Nm (lbf•ft) for pump foot and split casing bolts

Bolt size

Class 8.8

Duplex and

super duplex

A193 Gr

B7M

A4-80

M 16 (⅝ in.)

160 (120)

113 (90)

135 (100)

150 (120)

M 20 (¾ in.)

310 (230)

218 (170)

262 (200)

291 (220)

M 24 (⅞ in.)

535 (400)

376 (280)

451 (340)

502 (380)

M 27 (1 in.)

785 (580)

552 (410)

662 (490)

736 (550)

M 30 (1⅛ in.)

1 100 (820)

773 (580)

928 (690)

1 031 (770)

M 36 (1⅜ in.)

1 850 (1 370)

1 301 (960)

1561 (1 160)

1 734 (1 280)

M 42 (1⅝ in.)

3 000 (2 220)

2 109 (1 560)

2 531 (1 870)

2 813 (2 080)

M 48 (1⅞ in.)

4 500 (3 320)

3 164 (2 340)

3 797 (2 810)

4 219 (3 120)

Any loss of coating material is considered to be
normal wear and tear on the pump and is not
considered as warranty. Flowserve has applied the
coatings according to the supplier's instructions but
will not be held responsible for coating wear or cracks
that may develop over time.

6.3 Spare parts

6.3.1 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.

4) Part number – taken from section 8.

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.

6.3.2 Storage of spares

Spares should be stored in a clean dry area away
from vibration. Inspection and re-treatment of
metallic surfaces (if necessary) with preservative is
recommended at 6 monthly intervals

6.4 Recommended spares and

consumable items

For start-up purposes:

1 - complete set of gland packing
2 - shaft sleeves
1 - set of gaskets and seals
(optional: 2 - mechanical seals)

For 2 years operation:

1 - set of bearings (line and thrust)
2 - sets of gland packing
2 - shaft sleeves
2 - sets of gaskets and seals
2 - lantern rings
2 - casing wear rings
(optional: 2 - mechanical seals

2 - impeller wear rings)

For 4 years operation:

1 - set of bearings (line and thrust)
2 - sets of gland packing

2 - shaft sleeves
2 - sets of gaskets and seals
2 - lantern rings
2 - casing wear rings
1 - impeller
(optional: 2 - mechanical seals

2 - impeller wear rings)

6.5 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
 C-spanner (wrench) - for removing shaft nut.

(If difficulties in sourcing are encountered,
consult Flowserve.)

6.6 Fastener torques

6.6.1 Pump split case bolts and pump foot
bolts

The standard bolt class is A4-80, 8.8 or higher with
lubricated thread (600 MPa and 640 MPa yield
strength respectively or higher). Unless otherwise
specified on the pump GA drawing, the following
torques shall be applied on the pump foot bolts and
pump split case bolts:

Non-metallic gaskets incur creep
relaxation - before commissioning the pump check
and retighten fasteners to tightening torques stated.

Page 29 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Bolt

size

Torque Nm (lbf•ft) - other bolt locations

Class

8.8

Class

6.8

Dupl

Class

5.8

A193

Gr B7M

316 SS

A4-80

M 16

(⅝ in.)

160

(120)

120

(90)

100

(80)

135

(100)

45

(40)

150

(120)

M 20

(¾ in.)

310

(230)

233

(180)

194

(150)

262

(200)

87

(70)

291

(220)

M 24

(⅞ in.)

535

(400)

401

(300)

334

(250)

451

(340)

150

(120)

502

(380)

M 27

(1 in.)

785

(580)

589

(440)

491

(370)

662

(490)

221

(170)

736

(550)

M 30

(1⅛ in.)

1100

(820)

825

(610)

688

(510)

928

(690)

309

(230)

1031

(770)

M 36

(1⅜ in.)

1850

(1370)

1388

(1030)

1156

(860)

1561

(1160)

520

(390)

1734

(1280)

M 42

(1⅝ in.)

3000

(2220)

2250

(1660)

1875

(1390)

2531

(1870)

844

(630)

2813

(2080)

M 48

(1⅞ in.)

4500

(3320)

3375

(2490)

2813

(2080)

3797

(2810)

1266
(940)

4219

(3120)

6.6.2 Other bolt locations

For the tightening sequence also refer to good

industry practice. See section 10.3, Reference 6, for
more detail.

6.7 Renewal clearances

As wear takes place between the impeller and casing
wear 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 radial clearance detailed in section

3.4.2 has doubled to 0.6 to 0.8 mm (0.024 to 0.032 in.),
depending on pump size. On the LNNV it is
recommended that the product lubricated bearing is
renewed at a diametrical clearance of 0.5 mm (0.02 in.).

6.8 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. See section 8, Parts lists and drawings.

6.8.1 Rotor unit

6.8.1.1 LNN and LNNC

a) Isolate motor and lock off electrical supply in

accordance with local regulations.
b) Isolate suction and discharge valves.
c) Remove coupling guards and disconnect the

coupling halves.
d) Drain pump casing. Remove any auxiliary piping

if applicable.

e) Unscrew and remove bearing housing setscrews

[6570.4].

f) Unscrew and remove nuts [6580.1 or 6580.4]

above split flange on upper half casing. Drive out
dowel pin [6810] (if fitted) from casing flange
halves. Remove upper half casing [1214].

g) Take out complete rotor unit and place onto two

support blocks.

6.8.1.2 LNNV

This pump is best removed from the system to carry out
complete strip down. It should be set down with the
shaft horizontal to enable the rotor to be removed.
a) Isolate motor and lock off electrical supply in

accordance with local regulations.
b) Isolate suction and discharge valves.
c) Remove coupling guards and disconnect the

coupling halves.
d) Drain pump casing and, if applicable, remove any

auxiliary piping.
e) Remove motor complete with motor stool and set

down carefully in a safe location.
f) Retain any shimming between stool and pump

casing.
g) Remove bolts securing pump suction and

discharge flanges.
h) Sling pump as shown in section 2.3 and take the

strain. Remove setscrews securing the pump

baseplate to the pump casing.
i) Remove the pump to a safe location and

manoeuvre the pump shaft into a horizontal position.
j) Unscrew and remove setscrews [6570.4 and

6570.5] securing the bearing housing and end

cover [3200 and 3266]. Remove end cover.
k) Unscrew and remove nuts [6580.5] above split

flange on upper half casing. If fitted to casing

flange halves, drive out dowel pin [6810].
l) Using jacking screws, remove upper half casing.
m) Carefully remove non-drive end stuffing box

housing [4110] complete with bearing housing

[3200] and bearing bush [3300]. The impeller

now rests on the casing ring.
n) Carefully take out complete rotor assembly.

Protect the bearing surface on the outside

diameter of the bearing sleeve [3400] from

damage and place rotor on two support blocks.
o) If supplied with optional grease lubricated bottom

line bearing, carefully remove the complete rotor

assembly after l) above and the upper half casing

has been removed.

6.8.2 Bearing housing

a) Remove bearing cover setscrews [6570.6] and

remove key [6700.2] from shaft end.
b) Remove shaft seal ring [4305.2] and pull off bearing

housing [3200] from the rotor.

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

1214

3200

If optional bearing isolators or stationary labyrinths

6.8.6 Shaft seal - component mechanical seal

are fitted in the bearing covers they can be
withdrawn complete with the covers. If replacement
is necessary they can be pressed out of the
respective covers. Take care not to damage O-ring
seals, when fitted, on shaft keyways etc.

Refer to any special instructions supplied with
the mechanical seal.
a) Remove seal cover screws [6570.7] and pull off

seal cover [4213] complete with the stationary
seal ring that is held in place by the O-ring seal.

c) The bearing housings, ball bearings,

and shaft seals can be removed without removal
of the upper half casing, providing the pump is

b) The mechanical seal cover can also be removed by

placing a wedge into the gland chamfer, as below:

fitted with a spacer coupling.

d) After unbolting the bearing housing, move it back

using a wedge, as below:

c) Mechanical seal assembly [4200.1] can now be

removed.

6.8.7 Shaft seal – cartridge mechanical seal

6.8.3 Line bearing

6.8.3.1 LNN and LNNC – drive end

Remove bearing [3011.2] from shaft using a bearing
puller ensuring pulling force is applied to the inner
race only.

6.8.3.2 LNNV – non-drive end

If the bearing bush is showing signs of wear it must
be removed by pressing out of the lower bearing
housing [3200].

If the non-drive end is fitted with the grease lubricated
ball bearing option, dismantle circlip [6544] and disc

spacer [3645] from the shaft and remove ball bearing,
[3011.2] for LNN or [3011.1] for LNNV, using a
bearing puller ensuring pulling force is applied to the
inner race only.

6.8.4 Thrust bearings

Unscrew and remove the self-locking bearing nut
[3712] and remove the bearing [3011.1] using a puller
as in 6.8.3.1 above.

If fitted with optional cartridge mechanical seal,
refer to any separate user instructions supplied.

Remove nuts [6580.2] to detach seal assembly from
stuffing box housing [4110] and slide off complete
seal assembly [4200].

6.8.8 Shaft sleeve

6.8.8.1 LNN, LNNC both ends and LNNV drive end

a) Loosen grub screw [6814.2] and unscrew shaft

nut [2910]. Remove shaft sleeve [2450] using its
pulling groove.

b) If after removing the seal cover, or cartridge seal,

there is no shaft nut [2910] visible, this means
that an unsleeved shaft is fitted. (See sectional
drawing for details.)

c) The shaft nut and spacer are accessible after

removing the stuffing box housing [4110] and
should be removed as described in a) above.

6.8.8.2 LNNV non-drive end

a) Remove capscrew [6579] and end cap [6415]

from shaft end.

On pumps with an un-sleeved shaft, check if a

bearing distance ring is fitted between the bearing and
the shaft shoulder. If so, this MUST be retained for
refitting during assembly.

6.8.5 Shaft seal - gland packing

a) Remove gland nuts [6580.2] and gland [4120].
b) Lever out gland ring [4131] using its grip groove.
c) Remove gland packing [4130] and lantern rings

[4134] using a bent wire.

b) Remove lower bearing sleeve [3400] and lower

sleeve [2400].

c) If fitted with optional grease lubricated ball

bearing the shaft sleeve should be removed as
detailed in section 6.8.8.1.

6.8.9 Impeller and wear rings

a) The impeller and wear rings can now be removed

if required.

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

6814.1

2300

2200

6811.1

1 500

b) When removing the rotor unit, the casing wear

rings [1500] will be attached to it as they are fixed
by two diametrically opposite pins [6811.1]
inserted into the casing ring and located in
grooves in the lower half casing.

c) If impeller rings [2300] are also fitted, they are

shrunk onto the impeller and fixed with grub
screws [6814.1] between their diametral mating
surfaces.

d) To remove the impeller rings, remove the locking

screws and heat up the ring until it slides off easily.

6.9 Examination of parts

Used parts must be inspected before

assembly to ensure the pump will subsequently run
properly. In particular, fault diagnosis is essential to
enhance pump and plant reliability.

6.9.1 Casing, seal housing and impeller

Inspect for excessive wear, pitting, corrosion, erosion or
damage and any sealing surface irregularities. Replace
as necessary.

6.9.2 Shaft and sleeve (if fitted)

Replace if grooved, pitted or worn.

6.9.3 Gaskets and O-rings

After dismantling, discard and replace.

6.9.4 Bearings

It is recommended that bearings are not re-used after
any removal from the shaft.

The plain liquid lubricated bearings may be re-used if
both the bearing bush and bearing sleeve show no
sign of wear, grooving or corrosion attack. (It is
recommended that both the bush and sleeve are
replaced at the same time.)

6.9.5 Bearing isolators, labyrinths or lip seals
(if fitted)

a) The lubricant, bearings and bearing housing

seals are to be inspected for contamination and
damage. If oil bath lubrication is utilized, these
provide useful information on operating
conditions within the bearing housing.

b) If bearing damage is not due to normal wear and

the lubricant contains adverse contaminants, the
cause should be corrected before the pump is
returned to service.

c) Labyrinth seals and bearing isolators should be

inspected for damage but are normally non­wearing parts and can usually be re-used.

d) Bearing seals are not totally leak free devices.

Oil from these may cause staining adjacent to the
bearings.

6.10 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 and that ball bearings are C3 fit. Apply thread
sealant to non-face sealing pipe thread fittings.

6.10.1 Wear rings

a) Impeller rings (when fitted) should be heated up

using a hotplate or hot oil bath and then slipped
onto the impeller and pressed down to the
shoulder. (Do NOT use a steel hammer to knock
them into position.)

b) Drill and tap 3 holes approximately 120 degrees

apart into the diameter between the mating faces
of the ring and impeller and insert grub screws.
(The existing half tapped holes from the removed
impeller ring cannot be re-used.)

c) Slip the casing wear rings over the impeller hubs

before mounting the rotor unit into the lower half
casing, ensuring the pins in the rings locate into
the holes in the casing.

d) Check the running clearance between impeller

and casing ring against the appropriate pump
size in section 3.4.2.

6.10.2 Impeller setting

a) When re-assembling the impeller on the shaft, it is

important to mount the impeller so that the vane tips
point away from the apparent flow direction.

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

b) The rotor always rotates towards the expanding

section of the volute.

c) The two shaft sleeves and shaft nuts clamping

the impeller define its position on the pump shaft
and hence in the pump casing.

d) The correct axial position of the impeller and

mechanical seals can be checked with the
grooved checking marks on the pump shaft.

6.10.3 Shaft seal - packed gland

a) Fit impeller key and slide impeller onto shaft.
b) Insert O-ring into shaft sleeves and slide sleeves

along shaft and into the impeller hubs. Lightly
lubricate the shaft and O-ring for easier assembly.

No O-rings are fitted beneath

LNNV product lubricated bearing sleeves (see
sectional drawing). On unsleeved shaft versions
an O-ring is fitted at each end of the spacer.

c) Tighten and adjust shaft nuts so that their distances

to the grooved marks are equal at both ends.

d) Lock the shaft nuts in place with grubscrews.

Tighten capscrew (LNNV).

e) Slide the stuffing box housings over the shaft and

fit the O-ring [4610.6].

This O-ring must be replaced at

each and every dismantling.

f) Place the gland ring [4131] over the sleeve.

6.10.4 Shaft seal - component mechanical seal

Refer to any special instructions supplied with
the mechanical seal.
a) Slide the rotating assembly of the mechanical seal

along the shaft sleeve until the retaining ring has
reached the correct setting distance along the sleeve.
Tighten the grub screws to lock it into position.

b) Insert O-ring into shaft sleeves and slide sleeves

along shaft and into the impeller hubs. Lightly
lubricate the shaft and O-ring for easier assembly.

c) Tighten and adjust shaft nuts so that the distances

to the grooved marks are equal at both ends.

d) Lock the shaft nuts in place with grub screws.

Tighten cap 7screw (LNNV).

e) Slide the stuffing box housings over the shaft and

fit the O-ring [4610.6].

This O-ring must be replaced at

each and every dismantling.

f) Slip the mechanical seal covers [4213] together

with their installed stationary seal parts and O-rings
over the shaft.

g) If cartridge mechanical seals are to be fitted.

Refer to any special instructions supplied
with the mechanical seal. Cartridge seals are
usually fitted direct to the pump shaft as shown in
section 8.1.2.

6.10.5 Ball bearings - LNN, LNNC

Before mounting the bearings, proceed as follows:
a) Fit the shaft seal rings [4305.1] onto the shaft

and slide the bearing cover [3260.1] over the
shaft. If supplied also fit shaft seal ring [4305.3]
into shaft.

b) Pumps with grease lubricated bearings have V-ring

seals on the outside of the bearing cover only.
Pumps with oil lubricated bearings have, in addition,
shaft seal rings [4305.3 and 4305.4] on the inside
of the bearing covers. If V-rings are fitted, the inner
V-rings have two small perforations in the lip. Inner
V-rings engage in the grooves in the shaft.

c) If new optional bearing labyrinth seals are to be

fitted, press them into their respective covers
before the covers are assembled to the shaft.
Take care not to damage O-ring seals. Ensure
liquid flinger [2540] is fitted to shaft before
bearing cover [3260.1] is slid onto the shaft.

d) If new optional bearing isolators are to be

fitted in the bearing covers refer to separate
instructions supplied with the isolators.

e) Determine the thickness of the laminated shim on

the thrust bearing side. Provisionally position the
bearing into the bearing housing seated against
the circlip and thrust washer.

f) Measure distance 'Y' on the bearing cover.
g) Measure distance 'Z' to face of bearing housing.
h) Shim thickness to give correct clearance will be

'Y' minus 'Z' = 0.1 to 0.2 mm (0.004 to 0.008 in.)
Place correct shims on the shaft.

i) The shim is laminated material with

an original thickness (T) of 1.0 mm (0.039 in.) and
laminate thickness of 0.05 mm (0.002 in.).

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

3011.1

3712

This allows the thickness to be varied in 0.05 mm
(0.002 in.) increments by peeling off layers to
achieve the required axial clearance.

j) For oil lubricated units only, place shaft seal ring

[4305.3] in the shaft grooves for correct positioning.

k) The bearing should be heated up to 100 C (212 F)

using a hotplate, hot oil bath or induction heater and
then slipped onto the shaft to the shoulder.

l) On the thrust bearing side, mount the self-locking

ring type nut.

m) Standard bearing arrangements using a pair of

angular contact bearings will normally be
mounted with the shoulders of the inner rings
arranged face to face as shown as standard:

n) Some high temperature applications and other

special applications may use a pair of angular
contact bearings mounted in a back-to-back
arrangement as shown. Installation instructions
will be order specific.

c) Secure the lower bearing housing into the

stuffing box housing.

d) Slide the stuffing box housing, complete with bearing

bush, over the shaft and fit the O-ring [4610.6].

e) If fitted with optional grease lubricated bottom

bearing, slide liquid flinger assembly [2540.1;

4610.3; 6814.3] and bearing cover assembly
[3260.1; 2500] onto shaft.

f) The bearing should be heated up to 100 C (212 F)

using a hotplate, hot oil bath or induction heater and
then slipped onto the shaft to the shoulder.

g) Secure to shaft with disc spacer [3645.1] and

circlip [6544.1].

6.10.7 Rotor unit

a) After completion of preceding steps, carefully

place the rotor into the lower half pump casing.
Make sure the fixing pins of the casing rings fit
correctly in the casing grooves and ensure correct
fit of locating pins at the stuffing box housing.

b) Although both stuffing box housings are identical

the locating pins in the lower half casing are
different for drive and non-drive sides. The
stuffing box housing should be rotated so that the
correct slot engages with the pin. The long pin
with small diameter must engage in the small
deep slot whilst the short larger diameter pin
engages in the shallower wider groove.

6.10.7.1 LNN sleeve bearings

In case sleeve bearings are fitted in the pump follow
the following assembly steps:
c) Fit the bearing bracket [3200.3] on the pump

lower half casing.

d) Fit the bearing housing lower half [3200.1] on the

bearing bracket. Place the centering pin.

e) Fit the sleeve bearing lower half [3300] in the

housing. Ensure the anti-rotation pin is fitted in the
lower sleeve bearing half and locked in bearing
housing groove as shown in the picture below.

f) Fit the lubrication oil ring on the sleeve bearing

(if provided).

6.10.6 Bearings - LNNV

a) Proceed as section 6.10.5 for the grease lubricated

ball thrust bearing at the drive end, ensuring shim
thickness is selected to give correct clearance.

b) If fitted with liquid lubricated bearing at non-drive

end press a new bearing bush [3300] into the lower
bearing housing [3200.1], making sure the face of
the bush is flush with the end of the housing.

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

1500

3645

6544

3126
SHIM

0.1 to 0.2 mm
(0.004 to 0.008 in.)

LIQUID
SEALANT

g) Fit the sleeve bearing upper half with pin and

screws as shown in the above picture

h) Put the bearing housing upper half and its screw

[6570.7].

6.10.8 Casing gasket

a) The gasket must be cut from asbestos-free sheet

material of 0.8 + 0.1/-0.05 mm (

1

/

in.) thickness,

32

by following the actual inner casing contour of the
lower half casing.

b) Special care must be exercised at the bores and

stuffing box housing.

c) The gasket must be accurately cut and fit flush

with these bores to prevent leakage at the O-ring.

d) Position gasket carefully onto the cleaned

surface of the lower half casing.

e) Coat the casing bottom half flange surface of the

wall between suction and discharge side with a
contact adhesive, as below:

To assist assembly, particularly on larger

sizes it may be advisable to use further adhesive
at key points around this flange.

f) Push gasket flush against fit of stuffing box

housing and secure gasket locally again using
the above adhesive paste.

Torque the nuts in 2 or more complete passes of
increasing torque values until the recommended
values are achieved.

 First pass: 50 % of specified torque
 Second pass: 100% of specified torque value

6.10.8.1 LNN tilting pad thrust bearings

In case a tiling pad thrust bearings is fitted in the
pump follow the following assembly steps.
i) Ensure the thrust floating rings [4243] are set on

the shaft.

j) Fit the [3031.1] thrust disc on the shaft.
k) Install the [3031.2] titling pads with its

temperature element (if provided) in the bearing
housing lower half.

l) Set the filler plate [3126] and appropriate shims.

The total recommended end play for the thrust
bearing shall be set between 0.23 mm (0.009 in)
to 0.30 mm (0.12 in).

6.10.9 Bearing housing

a) Insert the circlip [6544] and disc spacer [3645] at

the thrust bearing end.

The circlip and thrust washer must not

be fitted at the line bearing end.

LNN and LNNC - thrust bearing at non-drive end.
LNNV - thrust bearing at drive end.

g) Place upper half casing onto pump, ensuring

dowels or stuffing box and bearing housing make
correct alignment

h) Tighten upper half casing flange nuts/screws

according the following order:

Clearance between bearing outer race

and bearing cover

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

43 05.1

b) On oil lubricated units ensure that the shaft seal

rings [4305.3] are located in the grooves in the
shaft.

c) Slip the bearing housings over their respective

bearings and insert them into the recesses of the
pump casing.

d) Fit bearing housing setscrews [6570.4] and tighten.
e) Apply liquid sealant to bearing cover flange.
f) Ensure correct seating of shim.
g) Turn bearing cover to correct position:

For grease lubricated units – the grease nipple
can be found towards the top half of the bearing
casing.
For oil lubricated units – the oil plug sits towards
bottom half of the bearing casing.

h) Tighten bearing cover at bearing housing and

push the shaft seal ring [4305.1] against the
bearing cover.

The sealing surface of the shaft seal ring

must be covered with grease and pushed gently
up to the bearing cover, otherwise it may run hot!

6.10.10.2 Component mechanical seal [4200.1]

Refer to separate User instructions supplied

with the mechanical seal.
Fasten seal covers [4213] complete with O-ring

[4610.9] using screws [6570.7]. Connect flush line.
Connect any auxiliary piping.

6.10.10.3 Cartridge mechanical seal [4200]

If optional cartridge seals are fitted, refer to
separate User instructions supplied with the seal, for
securing and activating the seal.

i) Refit plugs, vents, oiler etc. as applicable.
j) On oil lubricated units at the drive end, place the

shaft seal ring [4305.4] over the shaft and position
in the groove to seal against the end cover.

k) Fit the end cover [3260.2] and the shaft seal ring

[4305.2], lubricate it with grease and push it up to
the end cover.

l) At the non-drive end, fit the bearing end cover

[3266] and tighten the screws [6570.5].

6.10.9.1 LNN shaft driven pump (if required)

m) Place the key [6700.5] in the groove and connect

the coupling [3810.2].
n) Reconnect the shaft driven pump [3810.1].
o) Connect the suction and discharge flange to the

suction and discharge skid line.
p) Ensure the axial probes wires are not in contact

with coupling hub

6.10.10 Stuffing box assembly

6.10.10.1 Gland packing

Insert inner two rings of packing, then lantern ring
halves and finally 2 or 3 more rings of packing.
Loosely fit the gland [4120] and connect flush line.

Page 36 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

FAULT SYMPTOM

P u m p o ve rh e ats an d se i ze s



Be a ri ng s h a v e sh or t li f e



P u m p v ib r a te s o r is no is y



M e c ha n ic al se a l h a s sh or t l if e



M e c ha n ic al se a l l e ak s e x ce ss iv e ly



P u m p r eq ui r es ex c e ss i v e po we r



P u m p l os e s pr i me a ft e r s t a rti n g



I n s uf fi ci en t p re s s ur e de ve l o pe d



I n s uf fi ci en t c ap ac i ty de l iv er ed



P u m p d oes no t de l iv er l iq ui d



PROBABLE CAUSES

POSSIBLE REMEDIES

A. System troubles





Pump not primed.

Check complete filling. Vent and/or prime.

 





Pump or suction pipe not completely filled with
liquid.

  



Suction lift too high or level too low.

Check NPSHA>NPSHR, proper submergence,
losses at strainers and fittings.

 





Insufficient margin between suction pressure and
vapor pressure.

  

Excessive amount of air or gas in liquid.

Check and purge pipes and system.

 



Air or vapor pocket in suction line.

Check suction line design for vapor pockets.

 

Air leaks into suction line.

Check suction pipe is airtight.

 

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

Check and replace faulty parts.
CONSULT FLOWSERVE.

 

Foot valve too small.

Investigate replacing the foot valve.

 

Foot valve partially clogged.

Clean foot valve.

  



Inlet of suction pipe insufficiently submerged.

Check out system design.

 



Speed too low.

CONSULT FLOWSERVE.



Speed too high.

CONSULT FLOWSERVE.

  

Total head of system higher than differential head
of pump.

Check system losses.
Remedy or CONSULT FLOWSERVE.



Total head of system lower than pump design
head.



Specific gravity of liquid different from design.

Check and CONSULT FLOWSERVE.







Viscosity of liquid differs from that for which
designed.

 

Operation at very low capacity.

Measure value and check minimum permitted.
Remedy or CONSULT FLOWSERVE.







Operation at high capacity.

Measure value and check maximum permitted.
Remedy or CONSULT FLOWSERVE.

B. Mechanical troubles

    



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 baseplate: tighten, adjust, grout
base as required.

    

Shaft bent.

Check shaft run-outs are within acceptable values.
CONSULT FLOWSERVE.

7 FAULTS; CAUSES AND REMEDIES

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LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

FAULT SYMPTOM

P u m p o ve rh e ats an d se i ze s



Be a ri ng s h a v e sh or t li f e



P u m p v ib r a te s o r is no is y



M e c ha n ic al se a l h a s sh or t l if e



M e c ha n ic al se a l l e ak s e x ce ss iv e ly



P u m p r eq ui r es ex c e ss i v e po we r



P u m p l os e s pr i me a ft e r s t a rti n g



I n s uf fi ci en t p re s s ur e de ve l o pe d



I n s uf fi ci en t c ap ac i ty de l iv er ed



P u m p d oes no t de l iv er l iq ui d



PROBABLE CAUSES

POSSIBLE REMEDIES

   

Rotating part rubbing on stationary part internally.

Check and CONSULT FLOWSERVE, if necessary.

    

Bearings worn.

Replace bearings.

  

Wearing ring surfaces worn.

Replace worn wear ring/surfaces.







Impeller damaged or eroded.

Replace or CONSULT FLOWSERVE for improved
material selection.



Leakage under sleeve due to joint failure.

Replace joint and check for damage.

 

Shaft sleeve worn or scored or running off center.

Check and renew defective parts.

  

Mechanical seal improperly installed.

Check alignment of faces or damaged parts and
assembly method used.

  

Incorrect type of mechanical seal for operating
conditions.

CONSULT FLOWSERVE.

    

Shaft running off center because of worn bearings
or misalignment.

Check misalignment and correct if necessary. If
alignment satisfactory check bearings for excessive
wear.

    

Impeller out of balance resulting in vibration.

Check and CONSULT FLOWSERVE.

  

Abrasive solids in liquid pumped.





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
running and repair.





Internal misalignment due to improper repairs
causing impeller to rub.

Check method of assembly, possible damage or
state of cleanliness during assembly.
Remedy or CONSULT FLOWSERVE, if necessary.

  

Excessive thrust caused by a mechanical failure
inside the pump.

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

 

Excessive grease in ball bearings.

Check greasing method.





Lack of lubrication for bearings.

Check hours run since last change of lubricant, the
schedule and its basis.





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

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





Damaged bearings due to contamination.

Check contamination source and replace damaged
bearings.

C. MOTOR ELECTRICAL PROBLEMS

   

Wrong direction of rotation.

Reverse 2 phases at motor terminal box.

 

Motor running on 2 phases only.

Check supply and fuses.

  

Motor running too slow.

Check motor terminal box connections and voltage.

Page 38 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

6569.4

3712

3126

3011.1

4213

2450

4610.1

4595.3

1214

1500

4590

2200

6521

3011.2

4131

4110

4130

3853

3260.1

4134

4610.6

4305.1

4420

6700.2

6569.3

4305.2

4595.5

2100

6700.1

1

3266

'A '

4510.1

6570.5

4200

1

6544

3200

6811.1

6580.2

3645

6572.3

6811.2

1213

4305.3

1

1

*

3260.2

4305.4

*

6515.2

6814.2

6570.4

6811.3

6570.6

4595.6

2910

4120

8 PARTS LISTS AND DRAWINGS

8.1 LNN and LNNC – grease lubricated, gland packed and component mechanical

seal option – sizes up to 350 mm discharge

 Leak proofing material Casco 145 or Marston Hydrosil 100RTV silicone compound.
* Note: items 4305.3 and 4305.4 - oil lubricated arrangement only.

(Drawing taken from C751/010.)

Page 39 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1213

Casing half lower

1214

Casing half upper

1500

Casing wear ring

2100

Shaft

2200

Impeller

2450

Shaft sleeve

2910

Shaft nut

3011.1

Ball bearing

3011.2

Ball bearing

3126

Shim

3200

Bearing housing

3260.1

Bearing cover

3260.2

Bearing cover

3266

Bearing end cover

3645

Disc spacer

3712

Bearing nut

3853

Grease nipple

4110

Stuffing box housing

4120

Gland

4130

Gland packing

4131

Follower (gland ring)

4134

Lantern ring

4213

Mechanical seal cover

4305.1

Shaft seal ring

4305.2

Shaft seal ring

4305.3

Shaft seal ring

4305.4

Shaft seal ring

4420

Sealing pipe

4510.1

Joint ring

4590

Gasket

4595.1

Joint ring

4595.2

Joint ring

4595.3

Joint ring

4595.4

Joint ring

4595.5

Joint ring

4595.6

Joint ring

4610.1

O-ring

4610.6

O-ring

6515.1

Drain plug

6515.2

Drain plug

6521

Vent plug

6544

Circlip

6569.1

Plug

6569.2

Plug

6569.3

Plug

6569.4

Plug

6570.1

Screw

6570.2

Screw

6570.3

Screw

6570.4

Screw

6570.5

Screw

6570.6

Screw

6572.1

Stud

6572.2

Stud

6572.3

Stud

6575

Jack screw

6580.1

Nut

6580.2

Nut

6700.1

Key

6700.2

Key

6810

Dowel pin

6811.1

Cylindrical pin

6811.2

Cylindrical pin

6811.3

Cylindrical pin

6814.2

Grub screw

Item

Description

2300

Impeller wear ring

2540

Flinger (liquid)

3855

Constant level oiler

4200

Mechanical seal (cartridge)

4305.1

Shaft seal ring

4305.3

Shaft seal ring

4330.1

Labyrinth ring

4330.2

Labyrinth ring

4330.3

Labyrinth ring

4330.4

Labyrinth ring

4510.3

Joint ring

4595.4

Joint ring

4595.6

Joint ring

4610.4

O-ring

4610.5

O-ring

6515.2

Drain plug

6529

Ventilation device (breather)

6569.2

Plug

6572.3

Stud

6580.3

Nut

6814.1

Grub screw

8161

Deflector heat sink

6569.1

4595.4

4595.1

6515.1

6569.2

6570.2

6580.1

6810

6570.1

6572.2

6570.3

6572.1
6575

4595.2

8.1.1 Parts list - LNN and LNNC - sizes up to
350 mm discharge

View on Arrow A

8.1.2 Options parts list - LNN and LNNC - sizes
up to 350 mm discharge

Page 40 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

46 10 . 4

46 10 . 5

43 30 . 4

OI L LUBRI CATION

4510 . 3 6529

4305 . 3

BEARING LABYRI NTH SEALS

4330 . 2

BEARING I SOLATORS

4330 . 1

6572.3 6580.2

42 0 0

IMPELLER HUB RING

4595 . 6

3855

6515 . 2

6569 . 2

4595 . 4

4305 . 1

2540

43 30 . 3

46 10 .4

46 10 .5

43 30 .4

6529

4305.3

BEARING LABYRINTH SEALS

4330.2

BEARING ISOLATORS

4330.1

68 14 .1

2300

4595.6

6569.2

4595.4

4305.1

2540

43 30 .3

4 6 1 0 .4

4 6 1 0 .5

4 3 3 0 .4

OIL LUBRICATION

451 0.3 652 9

430 5.3

BEARING LABYRINTH SEALS

459 5.6

385 5

651 5.2

656 9.2

459 5.4

430 5.1

2 5 4 0

4 3 3 0 .3

4610.4

4610.5

4330.4

4330.2

BEARING ISOLATORS

4330.1

4330.3

461 0.4

461 0.5

433 0.4

BEARING LABYRINTH SEALS

254 0

433 0.3

8.1.3 Scrap views options

Cartridge seals

Scrap section showing cartridge

seal fitted directly to pump shaft

Impeller rings

Bearing isolators

Bearing labyrinth seals

See also section 8.1 for positioning of drive end shaft seal rings

[4305.1, 4305.2, 4305.3 and 4305.4]

Oil lubrication

Deflector heat sink

Page 41 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

8.2 LNN and LNNC – grease lubricated and gland packed option – sizes greater than

350 mm discharge

(Drawing taken from A-1975663.)

Page 42 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1213

Casing half lower

1214

Casing half upper

1500

Casing wear ring

2100

Shaft

2200

Impeller

2450

Shaft sleeve

2910

Shaft nut

3011.1

Ball bearing

3011.2

Ball bearing

3126

Shim

3200

Bearing housing

3260.1

Bearing cover

3260.2

Bearing cover

3266

Bearing end cover

3645

Disc spacer

3712

Bearing nut

3853

Grease nipple

4110

Stuffing box housing

4120

Gland

4130

Gland packing

4131

Follower (gland ring)

4134

Lantern ring

4213

Mechanical seal cover

4305.1

Shaft seal ring

4305.3

Shaft seal ring

4420

Sealing pipe

4590

Gasket

4595.1

Joint ring

4595.2

Joint ring

4595.3

Joint ring

4595.4

Joint ring

4595.5

Joint ring

4595.6

Joint ring

4595.7

Joint ring

4610.1

O-ring

4610.2

O-ring

4610.6

O-ring

6515.1

Drain plug

6515.2

Drain plug

6521

Vent plug

6541

Lock washer

6544

Circlip

6569.1

Plug

6569.2

Plug

6569.3

Plug

6569.4

Plug

6570.4

Screw

6570.5

Screw

6570.6

Screw

6570.9

Screw

6572.1

Stud

6572.2

Stud

6572.3

Stud

6572.4

Stud

6572.5

Stud

6575

Jack screw

6580.1

Nut

6580.2

Nut

6580.3

Nut

6580.4

Nut

6580.5

Nut

6700.1

Key

6700.2

Key

6810

Dowel pin

6811.1

Cylindrical pin

6811.2

Cylindrical pin

6811.3

Cylindrical pin

6814.2

Grub screw

8.2.1 Parts list - LNN and LNNC - sizes greater
than 350 mm discharge

View on Arrow A

Stuffing box arrangement

Page 43 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1630

Throttling bush

2300

Impeller wear ring

2450

Shaft sleeve

2540

Flinger (liquid)

3011.1

Ball bearing

3855

Constant level oiler

4200

Mechanical seal (cartridge)

4200.1

Mechanical seal

4213

Mechanical seal cover

4305.1

Shaft seal ring

4305.3

Shaft seal ring

4330.1

Labyrinth ring

4330.2

Labyrinth ring

4330.3

Labyrinth ring

4330.4

Labyrinth ring

4510.3

Joint ring

4595.4

Joint ring

4595.6

Joint ring

4595.8

Joint ring

4610.3

O-ring

4610.4

O-ring

4610.5

O-ring

4610.9

O-ring

6515.2

Drain plug

6529

Ventilation device (breather)

6569.2

Plug

6570.7

Screw

6572.3

Stud

6580.3

Nut

6814.1

Grub screw

6814.3

Grub screw

4610.4

4610.5

4330.4

4330.2

BEARING ISOLATORS

4330.1

4330.3

46 10.4

46 10.5

43 30.4

6529

4305.3

BEARING LABYRINTH SEALS

4330.2

BEARING ISOLATORS

4330.1

68 14.1

2300

4595.6

6569.2

4595.4

4305.1

2540

43 30.3

8.2.2 Options parts list - LNN and LNNC - sizes
greater than 350 mm discharge

Oil lubrication

Bearing isolators

Mechanical seals and cartridge seals

with and without shaft sleeve

Two single row angular contact ball bearings

Impeller rings

Page 44 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1220.1

Bearing cover

1220.2

Thrust bearing cover

2450.4

Axial probe disc

3031.1

Thrust disc

3031.2

Titling pad thrust bearing

3712.1

Nut

3712.2

Nut

4243

Floating ring

6541.1

Washer

6541.2

Washer

6700.4

Key

6700.5

Key

Item

Description

3200.1

Bearing housing upper half

3200.2

Bearing housing lower half

3200.3

Bearing bracket

3266

Bearing cover

3300

Sleeve bearing

3861

Oil ring (if applicable)

4330.1

Bearing isolator

4330.2

Bearing isolator

6570.1

Screw

6570.2

Screw

6580.2

Nut

8.2.3 Tilting pad thrust bearing – sizes greater than 350 mm discharge

8.2.4 Sleeve bearing– sizes greater than 350 mm discharge

Page 45 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

3266

6700.3

3200.1

2400

1214

4595.3

4420

4110

3126

3260.1

6569.3

4305.2

6700.2

4590

1500

2200

6521

4137

4610.2

4305.1

3011.1

4595.5

2100

6570.9

4200

3400

3300

6580.2

6811.3

1213

6811.1

6572.3

6415

2910

6814.2

6515.2

6570.6

4595.6

4595.7

4510.2

3260.2

3200

6570.4

4120

4131

4130

6700.1

2450

4134

6811.26570.86579

3712

3645

6544

3853

4610.6

6569.46570.5

4213

8.3 LNNV sleeve bearing type – grease lubricated, component mechanical seal and

gland packed option – sizes up to 350 mm discharge

 Leak proofing material Casco 145 or Marston Hydrosil 100RTV silicone compound.
 Screw secured with Casco ML type 119 or Loctite 270.

(Drawing taken from C751/011.)

Page 46 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1213

Casing half lower

1214

Casing half upper

1500

Casing wear ring

2100

Shaft

2200

Impeller

2400

Sleeve

2450

Shaft sleeve

2910

Shaft nut

3011.1

Ball bearing

3126

Shim

3200

Bearing housing

3200.1

Bearing housing

3260.1

Bearing cover

3260.2

Bearing cover

3266

Bearing end cover

3300

Bearing bush

3400

Bearing sleeve

3645

Disc spacer

3712

Bearing nut

3853

Grease nipple

4110

Stuffing box housing

4120

Gland

4130

Gland packing

4131

Follower (gland ring)

4134

Lantern ring

4137

Drip pan

4213

Mechanical seal cover

4305.1

Shaft seal ring

4305.2

Shaft seal ring

4420

Sealing pipe

4510.2

Joint ring

4590

Gasket

4595.1

Joint ring

4595.2

Joint ring

4595.3

Joint ring

4595.4

Joint ring

4595.5

Joint ring

4595.6

Joint ring

4595.7

Joint ring

4610.2

O-ring

4610.6

O-ring

6415

Cap

6515.1

Drain plug

6515.2

Drain plug

6521

Vent plug

6544

Circlip

6569.1

Plug

6569.2

Plug

6569.3

Plug

6569.4

Plug

6570.1

Screw

6570.2

Screw

6570.3

Screw

6570.4

Screw

6570.5

Screw

6570.6

Screw

6570.8

Screw

6570.9

Screw

6572.1

Stud

6572.2

Stud

6572.3

Stud

6575

Jack screw

6579

Socket head cap screw

6580.2

Nut

6580.5

Nut

6700.1

Key

6700.2

Key

6700.3

Key

6810

Dowel pin

6811.1

Cylindrical pin

6811.2

Cylindrical pin

6811.3

Cylindrical pin

6814.2

Grub screw

6569.2

6572.1

6570.1

6810

6572.2

6570.3

6580.5

6570.2

6575

6569.1

4595.1

4595.2

4595.46515.1

8.3.1 Parts list – LNNV - sizes up to 350 mm
discharge

View on arrow A

Page 47 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

2300

Impeller wear ring

2500

Ring

2540.1

Flinger (liquid)

3011.2

Ball bearing

3200

Bearing housing

3266

Bearing end cover

3645.1

Disc spacer

4510.1

Joint ring

4610.3

O-ring

6544.1

Circlip

6570.5

Screw

6814.1

Grub screw

6814.3

Grub screw

3645.1

3011.2

1

GREASE LUBRICATED BOTTOM BEARING

2500

4610.3

2540.1

6814.3

1

2300

6814.1

4510.1

3266

6544.1

3645.1

3200

3011.2

6570.5

1

GREASE LUBRICATED BOTTOM BEARING

2500

4610.3

2540.1

6814.3

1

8.3.2 Options parts list – LNNV - sizes up to
350 mm discharge

Impeller rings

Grease lubricated bottom bearing

Note: Cartridge seal, bearing isolators and bearing labyrinth
seals may also be fitted as options to the LNNV. See section

8.1.2 above for details.

Page 48 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

8.4 LNNV sleeve bearing type – grease lubricated and gland packed option – sizes

greater than 350 mm discharge

(Drawing taken from A-1975665.)

Page 49 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1213

Casing half lower

1214

Casing half upper

1500

Casing wear ring

2100

Shaft

2200

Impeller

2400

Sleeve

2450

Shaft sleeve

2910

Shaft nut

3011.1

Ball bearing

3126

Shim

3200

Bearing housing

3200.1

Bearing housing

3260.1

Bearing cover

3260.2

Bearing cover

3266

Bearing end cover

3300

Bearing bush

3400

Bearing sleeve

3645

Disc spacer

3712

Bearing nut

3853

Grease nipple

4110

Stuffing box housing

4120

Gland

4130

Gland packing

4131

Follower (gland ring)

4134

Lantern ring

4137

Drip pan

4305.1

Shaft seal ring

4305.2

Shaft seal ring

4305.3

Shaft seal ring

4420

Sealing pipe

4590

Gasket

4595.1

Joint ring

4595.2

Joint ring

4595.3

Joint ring

4595.4

Joint ring

4595.5

Joint ring

4595.6

Joint ring

4595.9

Joint ring

4610.1

O-ring

4610.2

O-ring

4610.6

O-ring

4610.7

O-ring

4610.8

O-ring

4610.10

O-ring

6415

Cap

6515.1

Drain plug

6515.2

Drain plug

6521

Vent plug

6541

Lock washer

6544

Circlip

6569.1

Plug

6569.2

Plug

6569.3

Plug

6569.4

Plug

6569.5

Plug

6570.4

Screw

6570.5

Screw

6570.6

Screw

6570.8

Screw

6570.9

Screw

6572.1

Stud

6572.2

Stud

6572.3

Stud

6572.4

Stud

6572.5

Stud

6575

Jack screw

6579

Socket head cap screw

6580.1

Nut

6580.2

Nut

6580.3

Nut

6580.4

Nut

6580.5

Nut

6700.1

Key

6700.2

Key

6700.3

Key

6810

Dowel pin

6811.1

Cylindrical pin

6811.2

Cylindrical pin

6811.3

Cylindrical pin

6814.2

Grub screw

8.4.1 Parts list – LNNV - sizes greater than
350 mm discharge

View on arrow A

Stuffing box arrangement

Page 50 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Item

Description

1630

Throttling bush

2300

Impeller wear ring

2450

Shaft sleeve

2500

Ring

2540.1

Flinger (liquid)

3011.2

Ball bearing

3200

Bearing housing

3266

Bearing end cover

3645.1

Disc spacer

4200

Mechanical seal, cartridge

4200.1

Mechanical seal

4213

Mechanical seal cover

4510.1

Joint ring

4610.3

O-ring

4610.9

O-ring

6544.1

Circlip

6570.5

Screw

6570.7

Screw

6814.1

Grub screw

6814.3

Grub screw

3645.1

GREASE LUBRICATED BOTTOM BEARING

2500

2300

6814.1

4510.1

3266

6544.1

3645.1

3200

3011.2

6570.5

1

GREASE LUBRICATED BOTTOM BEARING

2500

4610.3

2540.1

6814.3

1

8.4.2 Options parts list – LNNV - sizes greater
than 350 mm discharge

Grease lubricated bottom bearing

Impeller rings

Mechanical seals and cartridge seals with

and without shaft sleeve

8.5 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.

Note: Component seal and cartridge seal, bearing isolators
and bearing labyrinth seals may also be fitted as options to
the LNNV. See section 8.2.2 above for details.

Page 51 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

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, 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:

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

Reference 2:

Pumping Manual, 9
Elsevier Advanced Technology, United Kingdom,

1995.

Reference 3:

Pump Handbook, 2nd edition, Igor J. Karassik et al,
McGraw-Hill Inc., New York, 1993.

Reference 4:

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

Reference 5:

ANSI B31.3 - Process Piping.

Reference 6:

ESA – Guidelines for safe seal usage (Flanges and
gaskets).

th

edition, T.C. Dickenson,

Page 52 of 56 flowserve.com

Notes:

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Page 53 of 56 flowserve.com

Notes:

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Page 54 of 56 flowserve.com

Notes:

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Page 55 of 56 flowserve.com

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14

Flowserve regional sales offices:

USA and Canada

Flowserve Corporation
5215 North O’Connor Blvd.
Suite 2300
Irving, Texas 75039-5421,USA
Telephone: [phone]

Europe, Middle East, Africa

Flowserve Corporation
Parallelweg 13
4878 AH Etten-Leur
The Netherlands
Telephone: [phone]

Latin America

Flowserve Corporation
Martín Rodriguez 4460
B1644CGN-Victoria-San Fernando
Buenos Aires, Argentina
Telephone: [phone]
Telefax: [phone]

Asia Pacific
Flowserve Pte. Ltd.
10 Tuas Loop
Singapore 637345
Telephone: [phone]
Telefax: [phone]

Your Flowserve factory contacts:

Nominal pump discharge <= 350:
Flowserve Pumps
Flowserve GB Limited
Lowfield Works, Balderton
Newark, Notts NG24 3BU
United Kingdom

Telephone (24 hours) [phone]
Sales & Admin Fax [phone]
Repair & Service Fax [phone]
Email [e-mail]

Nominal pump discharge >350:
Flowserve Pompes
13 Rue Maurice Trintignant
CS10001, 72234 Arnage Cedex, France

Telephone (24 hours) [phone]
Sales & Admin [phone]
Repair & Service Fax [phone]

Your local Flowserve representative:

North America:
Flowserve Pump Division
5310 Taneytown Pike, PO Box 91
Taneytown, MD 21787-0091, USA

Telephone [phone]
Customer Service Fax [phone]
Parts inquiry/order PH [phone]

South America:
Flowserve do Brasil Ltda
Av. Don Hélder Camara 5451
20771-001 Rio de Janerio, Brasil

Telephone [phone]
Fax [phone]

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