ITT GOULDS PUMPS 3311 Manual

Installation, Operations,
and Maintenance
Instructions
3311

Table of Contents
1 Introduction and Safety ....................................................................................................................................3
1.1 Important Safety Notice.............................................................................................................................3
1.2 Safety Warnings ........................................................................................................................................3
1.3 Safety ........................................................................................................................................................ 4
1.4 General precautions .................................................................................................................................. 5
1.5 Parts .......................................................................................................................................................... 8
2 Safety Instructions ............................................................................................................................................9
2.1 Safety instructions ..................................................................................................................................... 9
2.2 Qualification and training of operating personnel ...................................................................................... 9
2.3 Hazards in the event of non-compliance with the safety instructions........................................................9
2.4 Safety at work.......................................................................................................................................... 10
2.5 Safety instructions relevant to operation ................................................................................................. 10
2.6 Safety instructions relating to maintenance, inspection and assembly work........................................... 10
2.7 Unauthorized alterations and production of spare parts.......................................................................... 10
2.8 Unauthorized use .................................................................................................................................... 10
3 Application....................................................................................................................................................... 11
3.1 Limitation of use ...................................................................................................................................... 11
3.2 Wrong use ............................................................................................................................................... 11
3.3 Accessories ............................................................................................................................................. 11
3.4 Design and working principle .................................................................................................................. 11
3.5 Applications ............................................................................................................................................. 12
3.6 Nameplate Information ............................................................................................................................ 12
4 System Layout.................................................................................................................................................13
4.1 Pipework.................................................................................................................................................. 13
4.2 Electrical connections.............................................................................................................................. 19
5 Unpacking, Handling, Storage .......................................................................................................................20
5.1 Safety measures ..................................................................................................................................... 20
5.2 Unpacking ............................................................................................................................................... 20
5.3 Intermediate storage ............................................................................................................................... 20
5.4 Handling .................................................................................................................................................. 20
5.5 Preservation ............................................................................................................................................ 21
6 Pump Installation.............................................................................................................................................23
6.1 Prerequisites ........................................................................................................................................... 23
6.2 Safety measures ..................................................................................................................................... 23
6.3 General.................................................................................................................................................... 23
6.4 Motor ....................................................................................................................................................... 24
6.5 Alignment of the set ................................................................................................................................ 24
6.6 Grouting the baseplate ............................................................................................................................ 27
6.7 Pump installation in the piping system .................................................................................................... 27
6.8 Hydrostatic test........................................................................................................................................ 27
6.9 Cleaning, flushing and pickling of the pipework ...................................................................................... 27
7 Starting & Stopping Procedures....................................................................................................................28
7.1 Prerequisites ........................................................................................................................................... 28
Table of Contents
3311 Installation, Operations, and Maintenance Instructions 1

7.2 Safety measures ..................................................................................................................................... 28
7.3 Electrical connection ............................................................................................................................... 28
7.4 Checks before first start-up ..................................................................................................................... 28
7.5 Starting procedure...................................................................................................................................29
7.6 Particular information ............................................................................................................................. 29
7.7 Stopping procedure ................................................................................................................................. 29
8 Maintenance, Disassembly, Assembly ..........................................................................................................31
8.1 Prerequisites ........................................................................................................................................... 31
8.2 Safety measures ..................................................................................................................................... 31
8.3 Maintenance and inspection.................................................................................................................... 31
8.4 Disassembly ........................................................................................................................................... 33
8.5 Preparation for disassembly ...................................................................................................................33
8.6 Replacement parts ................................................................................................................................. 33
8.7 Disassembly of the pump ....................................................................................................................... 33
8.8 Discharge side drive................................................................................................................................34
8.9 Dismantling of the bearings.....................................................................................................................34
8.10 Dismantling of shaft seal ...................................................................................................................... 37
8.11 Dismantling of balancing device ............................................................................................................38
8.12 Dismantling of hydraulic unit ................................................................................................................. 38
8.13 Suction side drive .................................................................................................................................. 39
8.14 Dismantling the oil-lubricated anti-friction bearing - drive side .............................................................. 39
8.15 Dismantling the shaft seal - drive side................................................................................................... 39
8.16 Dismantling of oil-lubricated anti-friction bearing- non-drive side.......................................................... 40
8.17 Dismantling of shaft seal - non-drive side ............................................................................................. 42
8.18 Dismantling of the balancing device......................................................................................................43
8.19 Dismantling of hydraulic unit ................................................................................................................. 44
8.20 Work after disassembly ........................................................................................................................ 44
8.21 Assembly ..............................................................................................................................................45
8.22 Pump assembly.....................................................................................................................................45
8.23 Shaft seal .............................................................................................................................................. 45
8.24 Bearings ................................................................................................................................................ 46
9 Locating Troubles............................................................................................................................................49
9.1 Troubles and possible causes.................................................................................................................49
10 Sectional Drawing / Parts List......................................................................................................................51
10.1 Sectional Drawing – Size: 2x3-7 ........................................................................................................... 51
10.2 Sectional Drawing – Size: 2.5x4-8 & 4x5-11 .........................................................................................51
10.3 Sectional Drawing – Size: 2x3-7 ........................................................................................................... 53
10.4 Sectional Drawing – Size: 2.5x4-8 & 4x5-11 .........................................................................................54
10.5 Sectional Drawing – Size: 2x3-7 ........................................................................................................... 55
10.6 Sectional Drawing – Size: 2.5x4-8 & 4x5-11 .........................................................................................56
10.7 Sectional Drawing – Size: 2x3-7 ........................................................................................................... 57
10.8 Sectional Drawing – Size: 2.5x4-8 & 4x5-11 .........................................................................................58
10.9 Sectional Drawing – Size: 2x3-7 ........................................................................................................... 59
10.10 Sectional Drawing – Size: 2.5x4-8 & 4x5-11 .......................................................................................60
10.11 Sectional Drawing – Size: 2x3-7..........................................................................................................61
10.12 Sectional Drawing – Size: 2.5x4-8 & 4x5-11 .......................................................................................62
10.13 Parts list............................................................................................................................................... 63
Table of Contents
2 3311 Installation, Operations, and Maintenance Instructions

1 Introduction and Safety
1.1 Important Safety Notice
To: Our Valued Customers:
User safety is a major focus in the design of our products. Following the precautions outlined in this man-
ual will minimize your risk of injury.
ITT Goulds pumps will provide safe, trouble-free service when properly installed, maintained, and operat-
ed.
Safe installation, operation, and maintenance of ITT Goulds Pumps equipment are an essential end user
responsibility. This Pump Safety Manual identifies specific safety risks that must be considered at all
times during product life. Understanding and adhering to these safety warnings is mandatory to ensure
personnel, property, and/or the environment will not be harmed. Adherence to these warnings alone,
however, is not sufficient — it is anticipated that the end user will also comply with industry and corporate
safety standards. Identifying and eliminating unsafe installation, operating and maintenance practices is
the responsibility of all individuals involved in the installation, operation, and maintenance of industrial
equipment.
Please take the time to review and understand the safe installation, operation, and maintenance guide-
lines outlined in this Pump Safety Manual and the Instruction, Operation, and Maintenance (IOM) man-
ual. Current manuals are available at https://www.gouldspumps.com/en-US/Tools-and-Resources/Litera-
ture/ or by contacting your nearest Goulds Pumps sales representative.
These manuals must be read and understood before installation and start-up.
For additional information, contact your nearest Goulds Pumps sales representative or visit our Web site
at https://www.gouldspumps.com
1.2 Safety Warnings
Specific to pumping equipment, significant risks bear reinforcement above and beyond normal safety
precautions.
WARNING:
A pump is a pressure vessel with rotating parts that can be hazardous. Any pressure vessel
can explode, rupture, or discharge its contents if sufficiently over pressurized causing death,
personal injury, property damage, and/or damage to the environment. All necessary measures
must be taken to ensure over pressurization does not occur.
WARNING:
Operation of any pumping system with a blocked suction and discharge must be avoided in all
cases. Operation, even for a brief period under these conditions, can cause superheating of
enclosed pumpage and result in a violent explosion. All necessary measures must be taken by
the end user to ensure this condition is avoided.
WARNING:
The pump may handle hazardous and/or toxic fluids. Care must be taken to identify the con-
tents of the pump and eliminate the possibility of exposure, particularly if hazardous and/or tox-
ic. Potential hazards include, but are not limited to, high temperature, flammable, acidic, caus-
tic, explosive, and other risks.
1 Introduction and Safety
3311 Installation, Operations, and Maintenance Instructions 3

WARNING:
Pumping equipment Instruction, Operation, and Maintenance manuals clearly identify accepted
methods for disassembling pumping units. These methods must be adhered to. Specifically,
applying heat to impellers and/or impeller retaining devices to aid in their removal is strictly for-
bidden. Trapped liquid can rapidly expand and result in a violent explosion and injury.
ITT Goulds Pumps will not accept responsibility for physical injury, damage, or delays caused by a failure
to observe the instructions for installation, operation, and maintenance contained in this Pump Safety
Manual or the current IOM available at http://www.gouldspumps.com/literature.
1.3 Safety
Definitions
Throughout this manual the words Warning, Caution, Electrical are used to indicate where special opera-
tor attention is required.
Observe all Cautions and Warnings highlighted in the Pump Safety Manual and the IOM provided with
your equipment.
WARNING:
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
Example: Pump shall never be operated without coupling guard installed correctly.
CAUTION:
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
Example: Throttling flow from the suction side may cause cavitation and pump damage.
Electrical Hazard:
WARNING:
Indicates the possibility of electrical risks if directions are not followed.
Example: Lock out driver power to prevent electric shock, accidental start-up, and physical in-
jury.
Install the shaft guard - if provided
WARNING:
•Running a pump without safety devices exposes operators to risk of serious personal in-
jury or death. Never operate a unit unless appropriate safety devices (guards, etc.) are
properly installed.
• Failure to disconnect and lock out driver power may result in serious physical injury or
death. Always disconnect and lock out power to the driver before performing any installa-
tion or maintenance tasks.
• Electrical connections must be made by certified electricians in compliance with all
international, national, state, and local rules.
• Refer to driver/coupling/gear manufacturer's installation and operation manuals
(IOM) for specific instructions and recommendations.
1.3 Safety
4 3311 Installation, Operations, and Maintenance Instructions

Exposed rotating shaft between pump seal and bearing frame. Avoid contact and/or install proper guard-
ing. If guarding is not provided with the pump, contact Goulds for price and availability of proper guard-
ing.
1.4 General precautions
WARNING:
A pump is a pressure vessel with rotating parts that can be hazardous. Hazardous fluids may
be contained by the pump including high temperature, flammable, acidic, caustic, explosive,
and other risks. Operators and maintenance personnel must realize this and follow safety
measures. Personal injuries will result if procedures outlined in this manual are not followed.
ITT Goulds Pumps will not accept responsibility for physical injury, damage or delays caused
by a failure to observe the instructions in this manual and the IOM provided with your equip-
ment.
Table 1: General Precautions
WARNING NEVER APPLY HEAT TO REMOVE IMPELLER. It may explode due to trap-
ped liquid.
WARNING NEVER use heat to disassemble pump due to risk of explosion from tapped
liquid.
WARNING NEVER operate pump without coupling guard correctly installed.
WARNING NEVER run pump below recommended minimum flow when dry, or without
prime.
WARNING ALWAYS lock out power to the driver before performing pump maintenance.
WARNING NEVER operate pump without safety devices installed.
WARNING NEVER operate pump with discharge valve closed.
WARNING NEVER operate pump with suction valve closed.
WARNING DO NOT change service application without approval of an authorized ITT
Goulds Pumps representative.
WARNING Safety Apparel:
•Insulated work gloves when handling hot bearings or using bearing
heater
• Heavy work gloves when handling parts with sharp edges, especially
impellers
• Safety glasses (with side shields) for eye protection
• Steel-toed shoes for foot protection when handling parts, heavy tools,
etc.
• Other personal protective equipment to protect against hazardous/toxic
fluids
WARNING Receiving:
Assembled pumping units and their components are heavy. Failure to properly
lift and support equipment can result in serious physical injury and/or equip-
ment damage. Lift equipment only at specifically identified lifting points or as
instructed in the current IOM. Current manuals are available at www.gould-
spumps.com/literature_ioms.html or from your local ITT Goulds Pumps sales
representative. Note: Lifting devices (eyebolts, slings, spreaders, etc.) must
be rated, selected, and used for the entire load being lifted.
WARNING Alignment:
1.4 General precautions
3311 Installation, Operations, and Maintenance Instructions 5

Shaft alignment procedures must be followed to prevent catastrophic failure of
drive components or unintended contact of rotating parts. Follow coupling
manufacturer's coupling installation and operation procedures.
WARNING Before beginning any alignment procedure, make sure driver power is locked
out. Failure to lock out driver power will result in serious physical injury.
CAUTION Piping:
Never draw piping into place by forcing at the flanged connections of the
pump. This may impose dangerous strains on the unit and cause misalign-
ment between pump and driver. Pipe strain will adversely effect the operation
of the pump resulting in physical injury and damage to the equipment.
WARNING Flanged Connections:
Use only fasteners of the proper size and material.
WARNING Replace all corroded fasteners.
WARNING Ensure all fasteners are properly tightened and there are no missing fasten-
ers.
WARNING Startup and Operation:
When installing in a potentially explosive environment, please ensure that the
motor is properly certified.
WARNING Operating pump in reverse rotation may result in contact of metal parts, heat
generation, and breach of containment.
WARNING Lock out driver power to prevent accidental start-up and physical injury.
WARNING The impeller clearance setting procedure must be followed. Improperly setting
the clearance or not following any of the proper procedures can result in
sparks, unexpected heat generation and equipment damage.
WARNING If using a cartridge mechanical seal, the centering clips must be installed and
set screws loosened prior to setting impeller clearance. Failure to do so could
result in sparks, heat generation, and mechanical seal damage.
WARNING Never operate a pump without coupling guard properly installed. Personal in-
jury will occur if pump is run without coupling guard.
WARNING Make sure to properly lubricate the bearings. Failure to do so may result in ex-
cess heat generation, sparks, and / or premature failure.
CAUTION Never operate the pump without liquid supplied to mechanical seal. Running a
mechanical seal dry, even for a few seconds, can cause seal damage and
must be avoided. Physical injury can occur if mechanical seal fails.
WARNING Never attempt to replace packing until the driver is properly locked out and the
coupling spacer is removed.
WARNING DO NOT operate pump below minimum rated flows or with suction and/or dis-
charge valve closed. These conditions may create an explosive hazard due to
vaporization of pumpage and can quickly lead to pump failure and physical in-
jury.
WARNING Ensure pump is isolated from system and pressure is relieved before disas-
sembling pump, removing plugs, opening vent or drain valves, or disconnect-
ing piping.
WARNING Shutdown, Disassembly, and Reassembly:
Pump components can be heavy. Proper methods of lifting must be employed
to avoid physical injury and/or equipment damage. Steel toed shoes must be
worn at all times.
1.4 General precautions
6 3311 Installation, Operations, and Maintenance Instructions

WARNING The pump may handle hazardous and/or toxic fluids. Observe proper decon-
tamination procedures. Proper personal protective equipment should be worn.
Precautions must be taken to prevent physical injury. Pumpage must be han-
dled and disposed of in conformance with applicable environmental regula-
tions.
WARNING Operator must be aware of pumpage and safety precautions to prevent physi-
cal injury.
WARNING Lock out driver power to prevent accidental startup and physical injury.
CAUTION Allow all system and pump components to cool before handling them to pre-
vent physical injury.
CAUTION If pump is a Model NM3171, NM3196, 3198, 3298, V3298, SP3298, 4150,
4550, or 3107, there may be a risk of static electric discharge from plastic
parts that are not properly grounded. If pumped fluid is non-conductive, pump
should be drained and flushed with a conductive fluid under conditions that
will not allow for a spark to be released to the atmosphere.
WARNING Never apply heat to remove an impeller. The use of heat may cause an explo-
sion due to trapped fluid, resulting in severe physical injury and property dam-
age.
CAUTION Wear heavy work gloves when handling impellers as sharp edges may cause
physical injury.
CAUTION Wear insulated gloves when using a bearing heater. Bearings will get hot and
can cause physical injury.
WARNING Noise:
Sound pressure levels may exceed 80 dbA in operating process plants. Clear
visual warnings or other indicators should be available to those entering an
area with unsafe noise levels. Personnel should wear appropriate hearing pro-
tection when working on or around any equipment, including pumps. Consider
limiting personnel’s exposure time to noise or, where possible, enclosing
equipment to reduce noise. Local law may provide specific guidance regard-
ing exposure of personnel to noise and when noise exposure reduction is re-
quired.
WARNING Temperature:
Equipment and piping surfaces may exceed 130ºF (54ºC) in operating proc-
ess plants. Clear visual warnings or other indicators should alert personnel to
surfaces that may reach a potentially unsafe temperature. Do not touch hot
surfaces. Allow pumps operating at a high temperature to cool sufficiently be-
fore performing maintenance. If touching a hot surface cannot be avoided,
personnel should wear appropriate gloves, clothing, and other protective gear
as necessary. Local law may provide specific guidance regarding exposure of
personnel to unsafe temperatures.
WARNING This product contains Carbon Black a chemical known to the State of Califor-
nia to cause cancer. For more information go to www.P65Warnings.ca.gov
1.4 General precautions
3311 Installation, Operations, and Maintenance Instructions 7

1.5 Parts
The use of genuine Goulds parts will provide the safest and most
reliable operation of your pump. ITT Goulds Pumps ISO certifica-
tion and quality control procedures ensure the parts are manufac-
tured to the highest quality and safety levels.
Please contact your local Goulds representative for details on
genuine Goulds parts.
1.5 Parts
8 3311 Installation, Operations, and Maintenance Instructions

2 Safety Instructions
2.1 Safety instructions
This manual gives basic instructions which must be observed during installation, operation and mainte-
nance of the pump.
It is therefore imperative that this manual be read by the installer and the responsible personnel or oper-
ators prior to installation and commissioning. It must always be available on site.
Within this manual, safety instructions are marked with safety symbols.
Safety symbol to ISO 3864-B.3.1
This general hazard symbol highlights information non-compliance with which could cause a risk to per-
sonal safety.
Safety symbol to ISO 3864-B.3.6
This symbol refers to electrical hazards.
This word gives warning of a hazard to the machine.
Signs affixed to the machine, e.g.
• arrow indicating the direction of rotation
• symbols indicating fluid connections must be visible and kept legible.
2.2 Qualification and training of operating personnel
The personnel responsible for operation, maintenance, inspection and assembly must be properly
trained and qualified.
The responsibilities of the operating personnel must be exactly defined by the plant operator. If the staff
does not have the necessary knowledge, they must be trained and instructed, which may be performed
by the machine manufacturer or the supplier on behalf of the plant operator, if required. Moreover, the
plant operator is to make sure that the contents of this manual are fully understood by the operating per-
sonnel.
2.3 Hazards in the event of non-compliance with the safety
instructions
Non-compliance with the safety instructions may cause a risk to personnel as well as to the environment
and the machine. Non-compliance may result in a loss of any right to claim damages.
For example, non-compliance may involve the following hazards:
• failure of important functions of the equipment;
• failure of specified maintenance and repair procedures;
• electrical, mechanical and chemical hazards affecting personal safety;
• leakage of environmentally damaging substances.
2 Safety Instructions
3311 Installation, Operations, and Maintenance Instructions 9

2.4 Safety at work
When operating the pump, the safety instructions contained in this manual, the relevant national accident
prevention regulations and any other service and safety instructions issued by the plant operator must be
observed.
2.5 Safety instructions relevant to operation
•If hot or cold machine components involve hazards, the customer must ensure these components
are guarded against accidental contact.
• Guards for moving parts (e.g. coupling) must not be removed from the machine while in operation.
• Any leakage of hazardous (e.g. explosive, toxic, hot) fluids (e.g. from the shaft seal) must be
drained away so as to prevent any risk to personal safety or the environment. Statutory regulations
must be complied with.
• Hazards resulting from electricity must be prevented. Local regulations must be complied with.
2.6 Safety instructions relating to maintenance, inspection and
assembly work
It shall be the plant operator's responsibility to ensure that all maintenance, inspection and assembly
work is performed by authorized and qualified personnel who have adequately familiarized themselves
with the subject matter by studying this manual in detail.
Any work on the machine shall only be performed when it is not operating and has been properly se-
cured from starting. Always lock out power to the driver before performing pump maintenance. The pro-
cedure for stopping the machine described in this manual must be followed.
Pumps which handle hazardous fluids must be decontaminated.
On completion of work all safety and protective equipment must be re-installed and made operative
again.
Prior to restarting the machine, the instructions listed under 7.4 Checks before first start-up on page 28,
must be observed.
2.7 Unauthorized alterations and production of spare parts
Any modification to the machine is permissible only after consultation with Gould’s Pumps.
Using genuine spare parts and accessories authorized by the manufacturer is in the interest of safety.
Use of other parts may exempt the manufacturer from any liability.
2.8 Unauthorized use
Goulds Pumps, inc. will not be liable for any damages or delay caused by failure to comply with the pro-
visions of this instruction manual. The pump is not to be operated at speeds, working pressures, dis-
charge pressures or temperatures higher than, nor used with liquids other than, stated in the original or-
der acknowledgement or the conditions of service for which it was quoted without written permission
from Goulds Pumps.
2.4 Safety at work
10 3311 Installation, Operations, and Maintenance Instructions

3 Application
3.1 Limitation of use
Operation of the pump must be limited to the application and operating conditions stated by the purchas-
er and confirmed on the manufacturer's data sheet. The pump is covered by warranty under Gould’s
Pumps’ conditions of sale.
3.2 Wrong use
NOTICE:
Operate the pump only for the application stated on the data sheet. Operation outside these
limits of product application will increase the risk to personal safety and the environment.
CAUTION:
Do not exceed the density stated on the data sheet as this could cause a motor overload con-
dition.
Do not operate the pump outside its characteristic curve so as to avoid pump or motor dam-
age.
3.3 Accessories
The accessories supplied with the pump are indicated on the data sheet. Other accessories may be
mounted to the pump or the pump set only after Gould’s Pumps' prior consent.
3.4 Design and working principle
The 3311 high pressure pump of the Goulds multi-stage line is a horizontal multi-stage ring-section type
centrifugal pump.
It meets the technical requirements according to DIN ISO 5199 / EN 25199.
The pump casings are held together by external tie bolts and sealed against the atmosphere by O-rings.
The axial thrust is balanced by a hydraulic balancing device consisting of a disc/drum combination. An
additional lift-off device is available and intended for special applications. The balancing liquid flows back
through an external line to the suction casing.
Suction nozzle: axial or radial.
In the case of radial suction nozzle orientation, the suction casing pump feet assembly allows adaptation
to the installation requirements by rotating the casing.
Bearings:
Oil-lubricated anti-friction bearing on the discharge side; suction side sleeve bearing lubricated by the liq-
uid handled or oil-lubricated anti-friction bearing.
Shaft seal:
Packed stuffing box or mechanical seal according to DIN 24960.
Drive:
3 Application
3311 Installation, Operations, and Maintenance Instructions 11

Depending on its design, the pump is either driven from the discharge side or the suction side, by a cus-
tomary electric motor or turbine. The direction of rotation is counter-clockwise for discharge side drive,
and clockwise for suction side drive, when viewed from drive end.
3.5 Applications
• Municipal water supply:
Pumping stations, treatment plants, booster units.
• Water treatment:
Filtration, reverse osmosis.
• Pumps for industrial purposes:
General water supply, cold water, boiler feed installations, hot water, pumping of organic and inor-
ganic solutions, high-pressure gas washing; power water generation plants, purifying and cleaning
plants, desalinization plants.
• Power supply:
Small and medium-sized thermal stations, waste incineration installations.
3.6 Nameplate Information
Every pump has a Goulds nameplate that provides information about the pump. The tags are located on
the pump casing.
When ordering parts, you will need to identify the pump model, size, serial number, and the item number
of the required parts. Information can be taken from the pump casing tags. Item numbers can be found
later in this manual.
Pump Casing Tag – provides information about the pump’s hydraulic characteristics. Note the format of
the pump size: Discharge x Suction – Nominal maximum Impeller Diameter in inches.
(Example: 2x3-7)
3.5 Applications
12 3311 Installation, Operations, and Maintenance Instructions

4 System Layout
4.1 Pipework
General
In short discharge lines, the nominal diameter should be such that the piping resistance is only a small
proportion of the discharge head. For long pipelines, the most cost-effective solution should be deter-
mined on a case-by-case basis.
Flow velocity guidelines:
Suction line: vs ≈ 1.5 to 2.5 m/s
max. 3 m/s
Discharge line: vD ≈ 4 to 6 m/s
Abrupt cross-section transitions or sharp bends should be avoided. Flow disturbances must be kept to a
minimum when making necessary branches.
Unfavorable pipework layouts may impair the performance of the pump, especially on the suction side
(e.g. bends in several planes in front of the suction nozzle).
WARNING:
The pipework must be independently supported and positioned such that no excessive forces
and moments are exerted on the pump flanges.
Excessive loads could result in leakage and be hazardous to personnel.
CAUTION:
If hot water is handled, excessive pipework loads and moments can cause a misalignment of
the coupling between pump and driver, thus reducing the operating safety of the unit.
Once the flange bolts have been released, the flanges must not yield more than the amount correspond-
ing to the gasket thickness, nor must they be out of parallel nor bear against each other under stress.
Check that the flange gaskets do not extend into the interior of the pipe. All pipe components, valves and
fittings and the pump nozzles should be thoroughly cleaned before assembly.
Air-relief valves and drain valves must be installed in the suction and discharge lines.
In order to prevent the formation of air pockets,
• a feed line (supply source above the pump) should slope gradually downward towards the pump;
• a suction line (supply source below the pump) should gradually rise to the pump.
Shut-off valves must be installed in the suction and discharge lines and in all pipelines connecting the
pump with the liquid system.
The valves enable the pump to be depressurized and dismantled without having to drain the system.
Flow regulation at constant speed is permissible from the discharge side only.
CAUTION:
•The pipes should have at least the nominal diameter of the pump nozzles. Where this is
not possible, it should be ensured that the flow velocity in the suction or feed line does not
exceed 2 - 3 m/s.
4 System Layout
3311 Installation, Operations, and Maintenance Instructions 13

• Flange seals must not extend into the interior of the pipework.
• Clean the pipework prior to pump installation.
• Support the pipelines so as to prevent distortion of pump components.
• Avoid rough cross-section transitions and sharp bends.
• Eccentric reducers must be used in the event of different nominal diameters.
• In the event of unfavorable suction conditions, steady flow should be ensured over a
length of 15 x suction nozzle diameter upstream from the suction nozzle.
• Shut-off valves in the suction or discharge line must be fully open during operation and
must never be used to control the flow.
Suction or feed line
A suction line should rise to the pump and a feed line should slope gradually downward towards the
pump.
Figure 1: Suction and feed operation
Reducers mounted must be eccentric to eliminate the possibility of air pockets being formed.
Figure 2: Eccentric reducer
If the liquid is contaminated, a filter should be fitted upstream from the pump whose free-space sectional
area should be three times the pipe cross-sectional area.
CAUTION:
•The strainer is for starting purposes only. Solids which are smaller than the mesh size will
not be retained by the strainer.
• However, such small particles may collect in the lateral area of the impeller near the
clearances, in particular if their concentration is high.
4.1 Pipework
14 3311 Installation, Operations, and Maintenance Instructions

• In order to prevent clogging, it is recommended that the customer provide a sedimenta-
tion tank or a larger flushable fine strainer upstream from the pump.
Design:
Conical strainer with perforated plate support body with external fine screen, mesh size 0.5 mm, of corro-
sion-resistant material. The fine screen can be removed after several months of operation, once there
are no more deposits.
For new conical strainers supplied by Gould’s Pumps the pressure loss can be calculated as follows:
Hv
g2
2
v
·=
z
in m
v = medium flow velocity in reference cross-section, in m/s
ζ = 4, loss coefficient for new conical strainers
1. Pump suction nozzle/flange
2. Pipe section for strainer
3. Conical strainer (installed with its tip against flow direction)
4. Feed line
5. Differential pressure measuring instrument
Figure 3: Feed line with conical strainer
Determining the strainer pressure loss
Example:
Feed line = DN 125
Flow rate 80 m³/h
ζ = 4
v = 1.81 m/s in the feed line
Hv =
66.0
62.19
276.3
4
81.92
81.1
4
2
=·=
·
·
m
The suction line must be leak-proof and it must be possible to release all air. The suction opening of the
suction line should be well below the liquid level, and a foot valve with a strainer should be used. The
foot valve must be far enough from the bottom to avoid excessive inlet losses which could impair per-
formance.
4.1 Pipework
3311 Installation, Operations, and Maintenance Instructions 15

1. Eccentric reducer (suction operation) or concentric reducer (feed operation)
2. Shut-off valve
3. Suction line
4. Bend
5. Foot valve
6. Feed line
7. Non-return valve
8. Control valve
Figure 4: Pump installation
A shut-off valve should be installed in the feed line; it is to be closed for maintenance work.
It should be installed such that air pockets cannot form in the spindle cap, i.e. with the spindle in a hori-
zontal position or pointing vertically downward.
Vacuum equalizing pipe
If the pump draws from a system or tank under vacuum, an equalizing pipe must be installed connecting
the vent connection at the suction casing or the highest point of the suction line to a point above the
maximum liquid level in the suction tank.
• The line should be fitted with a shut-off valve which should only be closed for maintenance work on
the pump.
To assist in starting the pump, we also recommend that a pipeline, which can be shut off, be installed
between the first stage and the equalizing line.
4.1 Pipework
16 3311 Installation, Operations, and Maintenance Instructions

a. Equalizer line
b. Additional line
1. Shut-off valve
2. Shut-off valve (vacuum tight)
Figure 5: Vacuum operation
Discharge line
For flow control, install a shut-off valve as close to the pump nozzle as possible. It is recommended that
a non-return valve be installed between pump nozzle and shut-off valve, thus protecting the pump
against reverse rotation and also the pump and the foot valve against water hammer that may occur in
the event of sudden shut-down.
Minimum flow line
The minimum flow line (or bypass line) should be used if operation with the discharge side shut-off valve
closed is possible. The minimum flow valve ensures that a sufficient rate is automatically returned to the
suction side tank.
The minimum flow rate is shown on the curves or the data sheet.
Size t = 140 °C or lower t > 140 °C
2x3-7 20 % of QBEP 25 % of QBEP
2.5x4-8 20 % of QBEP 25 % of QBEP
4x5-11 25 % of QBEP 25 % of QBEP
Should exact calculation be required, please contact Gould’s Pumps.
CAUTION:
•Up to the shut-off or non-return valve, the line should be designed to suit the nominal
pressure of the discharge line, afterwards in accordance with the design pressure of the
feedwater/suction tank.
• Permissible velocity in the minimum flow line: 7 to 10 m/s.
• If an automatic device (bypass non-return valve) is used, ensure that even in the case of
trouble, liquid can be returned through the minimum flow line.
• Frequent checks are recommended. Early replacement of the minimum flow valve (which
is exposed to heavy wear) will prevent energy losses.
• The minimum flow valve should be installed near the pump discharge nozzle, upstream
from the discharge shut-off valve.
4.1 Pipework
3311 Installation, Operations, and Maintenance Instructions 17

• A non-return valve should be installed in the minimum flow nozzle or the minimum flow
line.
• For repair or overhaul work on the pump or the bypass non-return valve, a shut-off valve
must be installed in the minimum flow line (c).
a. Feed line
b. Discharge line
c. Bypass line
1. Bypass non-return valve
2. Conical strainer
Figure 6: Minimum flow control
Balancing line
The balancing line connects the discharge side shaft sealing casing with the suction casing. There is no
throttling or shut-off device in this line, which serves to hydraulically balance the pump.
The balancing line can also be returned by the customer to the feed tank or the feed line.
Venting during pump priming
Before starting the set, the pump and the suction line must be completely vented and filled with the liquid
handled. To bleed the air, several holes with plugs have been provided. Similar holes may be used in the
pipework. The shut-off valve in the suction or supply line must be fully open.
Cooling
Cooling is required if the temperature of the liquid handled exceeds 110 °C, if a packed stuffing box is
used, or 140 °C if a mechanical seal is installed. For this purpose the pump is equipped with a shaft seal-
ing casing which can be cooled. The connecting points for the cooling lines are on the shaft sealing cas-
ing. The customer should provide either an open circuit, i.e. a cooling water return line to the drain sys-
tem, or a closed circuit including a return to the cooling circuit to be provided.
4.1 Pipework
18 3311 Installation, Operations, and Maintenance Instructions