Goulds Pumps 3935 Manual

Installation, Operation and
Maintenance Instructions
Model 3935

S-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
manual will minimize your risk of injury.
ITT Goulds pumps will provide safe, trouble-free service when properly installed, maintained, and
operated.
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 guidelines
outlined in this Pump Safety Manual and the Instruction, Operation, and Maintenance (IOM) manual.
Current manuals are available at www.gouldspumps.com/literature_ioms.html 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
www.gouldspumps.com.

S-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 contents of the pump
and eliminate the possibility of exposure, particularly if hazardous and/or toxic. Potential hazards include, but
are not limited to, high temperature, flammable, acidic, caustic, explosive, and other risks.
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 forbidden. 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 www.gouldspumps.com/literature.

S-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 this 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
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 injury.
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 stationary
parts, resulting in a spark and heat generation.

S-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
equipment.
General Precautions
WARNING
NEVER APPLY HEAT TO REMOVE IMPELLER. It may explode due to
trapped 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 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.

S-5
General Precautions
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 misalignment 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 fasteners.
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 certified
and must be constructed from a non-sparking material.
WARNING
Never operate a pump without coupling guard properly installed. Personal injury
will occur if pump is run without coupling guard.
WARNING
Make sure to properly lubricate the bearings. Failure to do so may result in excess
heat generation, sparks, and / or premature failure.
CAUTION
The mechanical seal used in an ATEX classified environment must be properly
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
discharge valve closed. These conditions may create an explosive hazard due to
vaporization of pumpage and can quickly lead to pump failure and physical injury.

S-6
General Precautions
WARNING
Ensure pump is isolated from system and pressure is relieved before
disassembling pump, removing plugs, opening vent or drain valves, or
disconnecting 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
decontamination procedures. Proper personal protective equipment should be
worn. Precautions must be taken to prevent physical injury. Pumpage must be
handled and disposed of in conformance with applicable environmental
regulations.
WARNING
Operator must be aware of pumpage and safety precautions to prevent physical
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 prevent
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 explosion
due to trapped fluid, resulting in severe physical injury and property damage.
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.

S-7
ATEX CONSIDERATIONS and INTENDED USE
Special care must be taken in potentially explosive environments to ensure that the equipment is properly
maintained. This includes but is not limited to:
1. Monitoring the pump frame and liquid end temperature.
2. Maintaining proper bearing lubrication.
3. Ensuring that the pump is operated in the intended hydraulic range.
The ATEX conformance is only applicable when the pump unit is operated within its intended use. Operating,
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 includes 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.
Current IOMs are available at www.gouldspumps.com/literature_ioms.html or from your local ITT Goulds
Pumps Sales representative.
All pumping unit (pump, seal, coupling, motor and pump accessories) certified for use in an ATEX classified
environment, are identified by an ATEX tag secured to the pump or the baseplate on which it is mounted. A
typical tag would look like this:
The CE and the Ex designate the ATEX compliance. The code directly below these symbols reads as follows:
II
=
Group 2
2
=
Category 2
G/D
=
Gas and Dust present
T4
=
Temperature class, can be T1 to T6 (see Table 1)
Table 1
Code
Max permissible
surface temperature
oF (oC)
Max permissible
liquid temperature
oF (oC)
T1
842 (450)
700 (372)
T2
572 (300)
530 (277)
T3
392 (200)
350 (177)
T4
275 (135)
235 (113)
T5
212 (100)
Option not available
T6
185 (85)
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.

S-8
PARTS
The use of genuine Goulds parts will provide the safest and
most reliable operation of your pump. ITT Goulds Pumps ISO
certification and quality control procedures ensure the parts are
manufactured to the highest quality and safety levels.
Please contact your local Goulds representative for details on
genuine Goulds parts.