ITT GOULDS PUMPS 3935 Manual

Installation, Operation and
Maintenance Instructions
Model 3935

Table of Contents
1 Safety..................................................................................................................................................................3
1.1 Important Safety Notice............................................................................................................................. 3
1.2 Safety Warnings ........................................................................................................................................3
1.3 Safety ........................................................................................................................................................ 4
1.4 General precautions .................................................................................................................................. 5
1.5 .................................................................................................................................................................8
1.6 Parts .......................................................................................................................................................... 9
2 Introduction......................................................................................................................................................10
2.1 Introduction.............................................................................................................................................. 10
3 General ............................................................................................................................................................. 11
3.1 Importance of instructions ....................................................................................................................... 11
3.2 Special warnings ..................................................................................................................................... 11
3.3 Receiving inspection shortages.............................................................................................................. 11
3.4 Preservation and storage ........................................................................................................................ 11
3.5 Handling techniques................................................................................................................................ 11
4 Installation........................................................................................................................................................12
4.1 Location................................................................................................................................................... 12
4.2 Installation ............................................................................................................................................... 12
4.3 Piping ......................................................................................................................................................12
4.4 Alignment procedures .............................................................................................................................13
4.5 Mechanical seals..................................................................................................................................... 13
5 Operation .........................................................................................................................................................14
5.1 Start-up.................................................................................................................................................... 14
5.2 Operational checks.................................................................................................................................. 16
5.3 Shutdown procedure ............................................................................................................................... 16
6 Preventive and corrective maintenance........................................................................................................17
6.1 Lubrication............................................................................................................................................... 17
6.2 Mechanical seal....................................................................................................................................... 17
6.3 Vibration .................................................................................................................................................. 17
6.4 Performance............................................................................................................................................ 17
7 Disassembly and reassembly ........................................................................................................................ 18
7.1 Disassembly of pump .............................................................................................................................. 18
7.2 Inspection and overhaul .......................................................................................................................... 19
7.3 Reassembly of power end....................................................................................................................... 19
7.4 S Frame................................................................................................................................................... 19
7.5 M, L, X, and Y frames.............................................................................................................................. 20
7.6 Reassembly of liquid end ........................................................................................................................ 20
7.7 Bearing and seal replacement................................................................................................................ 23
7.8 Sectional view .........................................................................................................................................27
7.9 Parts list and materials of construction.................................................................................................... 28
7.10 Pressure/temperature capability............................................................................................................ 30
8 Trouble shooting .............................................................................................................................................31
8.1 Troubleshooting.......................................................................................................................................31
Table of Contents
Model 3935 Installation, Operation and Maintenance Instructions 1

9 Spare parts.......................................................................................................................................................33
9.1 Ordering spare parts ...............................................................................................................................33
9.2 Instructions for ordering spare parts........................................................................................................ 33
Table of Contents
2 Model 3935 Installation, Operation and Maintenance Instructions

1 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 Safety
Model 3935 Installation, Operation 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, and ATEX are used to indicate where
special operator 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.
ATEX:
WARNING:
When installed in potentially explosive atmospheres, the instructions that follow the Ex symbol
must be followed. Personal injury and/or equipment damage may occur if these instructions are
not followed. If there is any question regarding these requirements or if the equipment is to be
modified, please contact an ITT Goulds Pumps representative before proceeding.
Example: Improper impeller adjustment could cause contact between the rotating and station-
ary parts, resulting in a spark and heat generation.
1.3 Safety
4 Model 3935 Installation, Operation and Maintenance Instructions

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
1.4 General precautions
Model 3935 Installation, Operation and Maintenance Instructions 5

equipment damage. Lift equipment only at specifically identified lifting points
or as instructed in the current IOM. Current manuals are available at
www.gouldspumps.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:
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 The coupling used in an ATEX classified environment must be properly certi-
fied and must be constructed from a non-sparking material.
WARNING Never operate a pump without coupling guard properly installed. Personal in-
jury will occur if pump is run without coupling guard.
1.4 General precautions
6 Model 3935 Installation, Operation and Maintenance Instructions

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 The mechanical seal used in an ATEX classified environment must be proper-
ly certified. Prior to start up, ensure all points of potential leakage of process
fluid to the work environment are closed.
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 Dynamic seals are not allowed in an ATEX classified environment.
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.
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.
1.4 General precautions
Model 3935 Installation, Operation and Maintenance Instructions 7

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
1.5
Special care must be taken in potentially explosive environments to ensure that the equipment is proper-
ly maintained. This includes but is not limited to:
Description of Ex-Directives
The Ex-directives are a specification enforced in Europe and the United Kingdom for electrical and non-
electrical equipment installed in those locations. Ex-directives deal with the control of potentially explo-
sive atmospheres and the standards of equipment and protective systems used within these atmos-
pheres. The relevance of the Ex-requirements is not limited to Europe or the UK. You can apply these
guidelines to equipment installed in any potentially explosive atmosphere.
Guidelines for compliance
Compliance is fulfilled only when you operate the unit within its intended use. Do not change the condi-
tions of the service without the approval of an ITT representative. When you install or maintain explosion
proof products, always comply with the directive and applicable standards (for example, IEC/EN
60079-14).
1. Monitoring the liquid end temperature.
2. Maintaining proper bearing lubrication.
3. Ensuring that the pump is operated in the intended hydraulic range.
The Ex conformance is only applicable when the pump unit is operated within its intended use. Operat-
ing, installing or maintaining the pump unit in any way that is not covered in the Instruction, Operation,
and Maintenance manual (IOM) can cause serious personal injury or damage to the equipment. This in-
cludes any modification to the equipment or use of parts not provided by ITT Goulds Pumps. If there is
any question regarding the intended use of the equipment, please contact an ITT Goulds representative
before proceeding.
1.5
8 Model 3935 Installation, Operation and Maintenance Instructions

Current IOMs are available at https://www.gouldspumps.com/en-US/Tools-and-Resources/Literature/
IOMs/ or from your local ITT Goulds Pumps Sales representative.
All pumping unit (pump, seal, coupling, motor and pump accessories) certified for use in an Ex classified
environment, are identified by an Ex tag secured to the pump or the on which it is mounted. A typical tag
would look like this:
If applicable, your pump may have either a CE Ex (ATEX) tag or UKCA Ex tag affixed to the pump. See
the Safety section for a description of the symbols and codes. Typical nameplate only shown below, the
actual area classification may be different.
Figure 1: Typical Ex pump nameplate
Table 2: Temperature class definitions
Code Maximum permissible
pumpage temperature in °C | °F
Minimum permissible pumpage temperature in °C | °F
T1 450 | 842 372 | 700
T2 300 | 572 277 | 530
T3 200 | 392 177 | 350
T4 135 | 275 113 | 235
T5 100 | 212 Option not available
T6 85 | 185 Option not available
The code classification marked on the equipment must be in accordance with the specified area where
the equipment will be installed. If it is not, do not operate the equipment and contact your ITT Goulds
Pumps sales representative before proceeding.
II = Group 2
G/D = Gas and Dust present
T4 = Temperature class, can be T1 to T6 (see Table)
The code classification marked on the equipment must be in accordance with the specified area where
the equipment will be installed. If it is not, do not operate the equipment and contact your ITT Goulds
Pumps sales representative before proceeding.
1.6 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.
1.6 Parts
Model 3935 Installation, Operation and Maintenance Instructions 9

2 Introduction
2.1 Introduction
This instruction manual is intended to assist those involved with the installation, operation, and mainte-
nance of Goulds Model 3935 Multi-Stage Pumps.
It is recommended that this manual be thoroughly reviewed prior to installing or performing any work on
the pump or motor.
2 Introduction
10 Model 3935 Installation, Operation and Maintenance Instructions

3 General
3.1 Importance of instructions
The design, material, and workmanship incorporated into the construction of Goulds pumps make
them capable of giving long, trouble-free service. The life and satisfactory service of any mechanical unit,
however, are enhanced and extended by correct application, proper installation, periodic inspection, and
careful maintenance. This instruction manual was prepared to assist operators in understanding the con-
struction and correct methods of installing, operating, and maintaining these pumps.
Study thoroughly 3 General on page 11, 4 Installation on page 12, and 5 Operation on page 14 Sec-
tions and carefully follow the instructions for installation and operation. Sections 6 Preventive and correc-
tive maintenance on page 17, 7 Disassembly and reassembly on page 18, 8.1 Troubleshooting on
page 31, and 9.1 Ordering spare parts on page 33 are answers to trouble and maintenance questions.
Keep this instruction manual handy for reference. Further information can be obtained by contacting your
local branch office or the Engineered Products Division, Goulds Pumps, Inc., Seneca Falls, New York
13148.
3.2 Special warnings
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. This 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 without written permission of Goulds Pumps, Inc.
3.3 Receiving inspection shortages
Care should be taken when unloading pumps. If
shipment is not delivered in good order and in accordance with the Bill-of-Lading, note the damage or
shortage on both receipt and freight bill. Make any claims to the transportation company promptly. In-
struction sheets on various components, as well as the Instruction Book for the pump, are included in the
shipment - Do not discard.
3.4 Preservation and storage
GouIds normal domestic storage preparation is suitable for protecting the pump during shipment in cov-
ered trucks. It also provides protection during covered storage at the jobsite, and for a short period be-
tween installation and start-up.
CAUTION:
The Model 3935 is flushed with ethylene glycol at the factory and should be thoroughly flushed
for 30 minutes prior to installation in the customer's system. A caution tag has been affixed to
the pump regarding the instructions. Once the pump is flushed with water, it should be kept
completely filled to minimize rust formation.
3.5 Handling techniques
Care should be used in moving pumps. Where required by size of units, slings should be put under both
pump and motor.
3 General
Model 3935 Installation, Operation and Maintenance Instructions 11

4 Installation
4.1 Location
Pumping unit should be placed as close as practical to the source of supply. Floor space and head room
allotted to the unit must be sufficient for inspection and maintenance. Be sure to allow for crane or hoist
service.
4.2 Installation
Model 3935 pumps are multi-stage pumps, closecoupled to the driving motor. The pump should be sup-
ported only at the bearing frame (at the motor on pumps with Y frame) and pump foot. The unit should be
bolted to a substantial, rigid base to prevent distortion of the pump.
Pumps should not be hoisted in the air for mounting purposes with the motor bolted to the frame. Motors
should be mounted after the pump is securely installed on its permanent base.
On high temperature service, a gap should be left between the pump foot and end of the casing, or
shoulder of the discharge head, to allow for thermal expansion. The pump foot bolt (371U) should not be
tightened down until pump has reached operating temperature.
The discharge head should never be loosened or tightened to make up piping downstream of the pump.
On pumps with flanged suction and discharge connections, the pump foot fits over the casing.
Oil lubricated pumps must be installed in the horizontal position. Grease lubricated pumps may be instal-
led in the vertical position, but should have the motor above the pump. The Model 3935 should never run
dry. If there is any possibility that the pump's source of liquid might fail, a protective device should be
incorporated into the system to shut the pump down.
4.3 Piping
The pump should not run with a closed discharge for more than a few minutes, such as during startup or
shut-down. Sufficient heat can be transmitted to the fluid causing the liquid to vaporize and allow the
pump to run dry and fail. The suction pipe should never be of smaller diameter than the pump suction.
Use of suction pipe one or two sizes larger than the pump suction, with a reducer at the pump suction, is
desirable. The pump should never be throttled on the suction side. Quick closing valves should be avoid-
ed in the discharge line to protect the pump from damage due to surging and water hammer.
For operation at low flow, or to insure liquid will always be flowing through the pump, a bypass line
should be installed. The bypass line should be returned to the liquid source and injected below minimum
liquid level to prevent air entrainment.
If a bypass line is not used, it is recommended that precautions be taken to ensure that the pump will not
run dry, run at closed discharge, or handle pumpage of excessive temperature at pump suction. Devices
which can protect the pump from the above problems are flow switches or high temperature switches.
When handling liquids at elevated temperature, it is suggested that expansion loops or joints be installed
in the suction and discharge so that expansion of the piping will not impose excessive strain on the
pump.
Additional information on piping can be found in Hydraulic Institute Standards.
4 Installation
12 Model 3935 Installation, Operation and Maintenance Instructions

4.4 Alignment procedures
Pumps which have NEMA C-flange motors directly mounted to the bearing frame do not require pump
and motor shaft alignment. Jog motor to be sure rotation is correct before connecting coupling. Rotation
is counter-clockwise when viewed from the coupling end.
4.5 Mechanical seals
The pump is equipped with a mechanical seal. Damage can result if mechanical seals are run dry or in
abrasives. For special seals, follow the instructions on the seal drawing supplied with the order for recir-
culation, flush and/or cooling flows required.
4.4 Alignment procedures
Model 3935 Installation, Operation and Maintenance Instructions 13

5 Operation
5.1 Start-up
■Check List
1. Lubrication - J and S Frames
J Frame - J frame pumps have a greased-for-life ball bearing. No additional lubrication is required.
S Frame - S frame pumps have ball bearings which are greased at the factory.
Bearings should be regreased every 2000-3000 hours (3-4 months).
To regrease bearings:
1. Remove plug on top of bearing frame. Screw in Alemite grease fitting included in the box
fittings, shipped with the pump.
2. Add grease while turning shaft by hand until old grease is forced out of grease relief fitting at
bottom of bearing cap and fresh grease appears.
3. Remove grease fitting and reinstall plug.
2. Lubrication M, L, X and Y Frames
M, L, X and Y frames have flood oil lubricated bearings. The bearings are not lubricated at the fac-
tory. A constant level oiler, #5 TRICO, is packed with the pump.
a) Before installing the oiler on the bearing frame, check the oiler adjustment. The setting dimen-
sion 14.3 mm | 0.56" is illustrated in Figure: Dimensional checks.
b) Remove the small plastic plug from the large pipe plug on the left side of frame as viewed from
the motor end of the pump.
NOTICE:
The Y frame has a ¼-18 NPT tapped hole.
c) The nipple-elbow assembly is assembled finger-tight at the factory. Before
installing it on pump, the threaded connections should be made up with pipe sealant.
NOTICE:
The oiler may be installed on the right side of the pump (viewed from motor end) by moving the
2"-11½ NPT plug with ¼"-18 NPT tapped hole to right side and assembling as above.
d) Install the nipple-elbow assembly so that the long nipple (¼ NPT x 44mm | 1.75" long) extends
horizontally from the frame to the 90 degree elbow and the close nipple vertically from the el-
bow to the bottom connection of the oiler. Refer to Figure 2: Dimensional checks on page 15.
If oil level is too high (splashes out of breather), lower level 1.5mm | 0.06" at a time until splashing
stops.
5 Operation
14 Model 3935 Installation, Operation and Maintenance Instructions

1. Oil level
2. Side connection
3. 1/4" nipple-elbow assembly
4. Bearing frame
5. Initial setting for internal adjuster.
Figure 2: Dimensional checks
e) Fill bearing reservoir using oiler bottle. Several fillings will be required. Never fill the frame
through the frame breather located at the top of the frame or through the oiler without use of
the bottle. This can result in overfilling and high oil temperature.
f) After starting pump, remove the breather. Oil viewed through the breather hole should be a
mist. If oil is thrown out of the breather hole, or an oil mist is not visible, recheck all dimensions
shown in Figure: Dimensional checks.
3. Alignment
As described in 4.4 Alignment procedures on page 13, alignment is normally built-in and need not
be checked.
4. Mechanical Seal
Refer to 4.5 Mechanical seals on page 13. If auxiliary piping for cooling and/or flushing from an out-
side source is being used, establish these flows.
5. Priming
Pump and suction pipe must be full of liquid before pump is started. Usually, suction supply will be
primed when shut-off valves to pump are opened. If suction supply is below pump, priming by other
means such as foot valve or ejector will be required.
6. Check for Free Turning
Before pump is started, rotate shaft by hand to be sure it is free. If pump cannot be turned by hand,
or binding and rubbing are noticed, correct before starting.
■Start-up Procedures
1. Valves
5.1 Start-up
Model 3935 Installation, Operation and Maintenance Instructions 15

Be sure suction valve is fully open. Normally, discharge valve should be at least partially closed so
that flow will be controlled.
2. Rotation Check
With motor uncoupled from frame, jog motor to check for proper rotation.
Rotation should be counter-clockwise when viewed from coupling end. Recouple when satisfied.
3. Start
Pump is now ready to start.
5.2 Operational checks
Inspect pump carefully and frequently during the first few hours of operation. Mechanical seal may weep
slightly but should "run in" in a few hours. Be sure all auxiliary lines (cooling, flushing, sealing, etc.) are
functioning properly. Check pump bearings for excessive heating. Check motor for excessive heating.
Check complete unit for excessive vibration or unusual noise. Do not run pump at greatly reduced flow
because all the motor horsepower will go into heating the liquid in the pump and damage may result. Do
not run pump beyond maximum recommended flow since damage could result due to excessive wear on
the back washers (546).
Table 3: Maximum recommended flow
Pump 60 Hertz Speed 50 Hertz Speed
BP20 25 GPM 5.6 m3/h 20 GPM 4.5 m3/h
BP40 60 GPM 13.6 m3/h 50 GPM 11.4 m3/h
BP70 100 GPM 22 m3/h 80 GPM 18.2 m3/h
BP100 140 GPM 32 m3/h 115 GPM 26 m3/h
BP200 220 GPM 50 m3/ h 180 GPM 40 m3/h
5.3 Shutdown procedure
If pump is installed with a check valve, it can be shut down without closing any valves. When no check
valve is used, the discharge valve must be closed before the pump is stopped to prevent backflow
through the pump. If the pump is to be serviced, be sure suction valves are closed, auxiliary cooling and
flushing flows are shut off and motor is locked out before working on pump.
5.2 Operational checks
16 Model 3935 Installation, Operation and Maintenance Instructions

6 Preventive and corrective maintenance
6.1 Lubrication
Refer to 5.1 Start-up on page 14 for lubrication procedures for pump. Follow motor and coupling manu-
facturer's lubrication instructions.
6.2 Mechanical seal
The seal requires no attention other than to make sure that circulating lines, where installed, do not be-
come clogged.
6.3 Vibration
It is good practice to periodically monitor vibration of the pump. Normally, vibration level will be well be-
low accepted standards. Of equal importance is that the vibration level does not increase. If a problem
with vibration is encountered, refer to 8.1 Troubleshooting on page 31.
6.4 Performance
If performance deteriorates, refer to 8.1 Troubleshooting on page 31.
6 Preventive and corrective maintenance
Model 3935 Installation, Operation and Maintenance Instructions 17

7 Disassembly and reassembly
7.1 Disassembly of pump
1. Lock out power source.
2. Shut off valves controlling flow to and from pump. Disconnect piping.
3. Drain pump through plug (408A) in bottom of casing adapter.
NOTICE:
If pump has handled corrosive liquids, the motor end should be elevated to assure complete
draining. Flushing is recommended.
4. If pump is oil lubricated, drain oil through oil drain plug on bottom of bearing frame (228A).
5. Unbolt and remove motor from frame (228 or 228A).
NOTICE:
For pumps with other than insert-type couplings, If oil level is too high (splashes out of breath-
er), lower level 1.5mm | 0.06" at a time until splashing stops see coupling manufacturer's in-
structions for removal.
6. Loosen set screw in coupling hub (233), and remove hub and key (400) from stub shaft (380).
7. Loosen bolt (371U) so that discharge head (152) can turn in pump foot (131). Do not remove pump
foot at this time.
8. Slide a heavy bar or pipe through frame being careful not to let the bar contact the stub shaft (380).
Place a wrench on the discharge head. Unscrew the discharge head until casing (100) is loose.
Threads are right hand. Do not completely unscrew casing.
9. Set pump in a vertical position, resting on the frame (228 or 228A). Remove discharge head (152)
and pump foot (131). Unscrew and remove casing (100) from casing adapter (108). The casing
must be removed vertically so that the pump shaft is not bent. The total overhead clearance re-
quired will be the total pump length, less motor, plus the length of the casing (100).
10. Note location of casing 0-rings (412K) and record.
11. Remove the shaft retaining ring (361) and shims
(331) from shaft (122). Remove sleeves (157). Mark all parts for reassembly.
12. Slide diffusers (150), impellers (101), shims (331) and intermediate bearings (260) off shaft (122).
Also, note that some pumps may have spacer blanks (150A) substituted for some of the stages.
These will be located at the discharge end of the pump. Mark each impeller, diffuser, intermediate
bearing and shim washer to identify its position with the pump to aid in reassembly.
13. Remove impeller key (178) from shaft.
14. Unbolt and remove casing adapter (108) from seal housing (159).
15. Remove pump shaft (122) from splined end of stub shaft. For pumps with special mechanical seal
arrangements, the seal seat mount (158) is removed when the shaft is pulled out of the splined end
of the stub shaft. This must be done carefully to avoid mechanical seal damage.
16. Remove seal from shaft only if it is to be replaced. Use care to avoid cutting rubber bellows on
splined teeth of pump shaft. Remove retaining ring (361D) from shaft.
NOTICE:
BP20 does not use a retaining ring.
17. To remove the drive sleeve (522) and split collet (524) from the shaft, tap the drive sleeve (522)
away from the splined end of the shaft (122) and off the split collet (524). A piece of pipe sized to
seat against the larger end of the drive sleeve should be used for this. Spread the split collet with
suitable tool, remove it from the groove in the shaft and slide if off the shaft.
18. Remove seal seat mount (158) if not already pulled. (228 or 228A).
7 Disassembly and reassembly
18 Model 3935 Installation, Operation and Maintenance Instructions