ITT Goulds Pumps 3700 Manual

Installation, Operation and Maintenance Instructions
Model 3700 10th Edition (ISO 13709)
These instructions also apply to Model 3710.

Pump Safety Tips
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, especially in machine shop areas
•Steel-toed shoes for foot protection when
handling parts, heavy tools, etc.
•Other personal protective equipment to protect
against hazardous/toxic fluids
Coupling Guards:
•Never operate a pump without a coupling guard
properly installed
Flanged Connections:
•Never force piping to make a connection with a
pump
•Use only fasteners of the proper size and
material
•Ensure there are no missing fasteners
•Beware of corroded or loose fasteners
Operation:
•Do not operate below minimum rated flow, or
with suction/discharge valves closed
•Do not open vent or drain valves, or remove
plugs while system is pressurized
Maintenance Safety:
•Always lock out power
•Ensure pump is isolated from system and
pressure is relieved before disassembling pump,
removing plugs, or disconnecting piping
•Use proper lifting and supporting equipment to
prevent serious injury
•Observe proper decontamination procedures
•Know and follow company safety regulations
Observe all cautions and warnings highlighted in
pump Installation, Operation and Maintenance
Instructions.

FOREWORD
This manual provides instructions for the Installation, Operation, and Maintenance of the Goulds Model
3700 High Pressure, High Temperature Process Pump designed to meet the requirements of the
10th Edition of API* Standard 610 (ISO 13709). This manual covers the standard product plus common
options that are available. For special options, supplemental instructions are supplied. This manual
must be read and understood before installation and maintenance.
The design, materials, and workmanship incorporated in the construction of Goulds pumps make them capable of
giving long, trouble-free service. The life and satisfactory service of any mechanical unit, however, is enhanced
and extended by correct application, proper installation, periodic inspection, condition monitoring and careful
maintenance. This instruction manual was prepared to assist operators in understanding the construction and the
correct methods of installing, operating, and maintaining these pumps.
ITT Industries - Goulds Pumps shall not be liable for physical injury, damage or delays caused by a failure
to observe the instructions for Installation, Operation, and Maintenance contained in this manual.
!NOTE: When pumping unit is installed in a potentially explosive atmosphere, the instructions after
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 a Goulds representative before proceding.
Warranty is valid only when genuine ITT Industries - Goulds Pumps parts are used.
Use of the equipment on a service other than stated in the order will nullify the warranty, unless written approval is
obtained in advance from ITT Industries - Goulds Pumps.
Supervision by an authorized ITT Industries - Goulds representative is recommended to assure proper
installation.
Additional manuals can be obtained by contacting your local ITT Industries - Goulds representative or by calling
1-(800)-446-8537.
THIS MANUAL EXPLAINS
nProper Installation
nStart-up Procedures
nOperation Procedures
nRoutine Maintenance
nPump Overhaul
nTroubleshooting
nOrdering Spare or Repair Parts
3700-10th IOM 12/04 3
* American Petroleum Institute
1220 L Street, Northwest
Washington, D.C. 20005

43700-10th IOM 12/04

TABLE OF CONTENTS
PAGE
7 SAFETY
11 GENERAL INFORMATION
15 INSTALLATION
21 OPERATION
27 PREVENTIVE MAINTENANCE
31 DISASSEMBLY & REASSEMBLY
61 SPARE PARTS
63 APPENDIX
3700-10th IOM 12/04 5
3
4
5
7
8
2
1
6
SECTION

63700-10th IOM 12/04

SAFETY
DEFINITIONS ..................................7
GENERAL PRECAUTIONS...........................8
EXPLOSION PREVENTION ..........................8
SPECIAL ATEX CONSIDERATIONS......................8
ATEX IDENTIFICATION ............................9
INTENDED USE ................................9
CONDITION MONITORING...........................9
DEFINITIONS
This pump has been designed for safe and reliable
operation when properly used and maintained in
accordance with instructions contained in this manual.
A pump is a pressure containing device with rotating
parts that can be hazardous. Operators and
maintenance personnel must realize this and follow
safety measures. ITT Industries - Goulds Pumps
shall not be liable for physical injury, damage or
delays caused by a failure to observe the instructions
in this manual.
Throughout this manual the words WARNING,
CAUTION, and NOTE are used to indicate
procedures or situations which require special
operator attention:
s
!WARNING
Warning is used to indicate the presence of a
hazard which can cause severe personal injury,
death, or substantial property damage if the
warning is ignored.
$CAUTION
Caution is used to indicate the presence of a
hazard which will or can cause minor personal
injury or property damage if the warning
is ignored.
!NOTE: If equipment is to be installed in a
potentially explosive atmosphere and these
procedures are not followed, personal injury
or equipment damage from an explosion may
result.
"NOTE: Particular care must be taken when
the electrical power source to the equipment
is energized.
NOTE: Operating procedure, condition, etc.
which is essential to observe.
EXAMPLES
s
!WARNING
Pump shall never be operated without coupling
guard installed correctly.
$CAUTION
Throttling flow from the suction side may cause
cavitation and pump damage.
!NOTE: Improper impeller adjustment could
cause contact between the rotating and
stationary parts, resulting in a spark and heat
generation.
"NOTE: Lock out driver power to prevent
electric shock, accidental start-up and
physical inury.
NOTE: Proper alignment is essential for long
pump life.
3700-10th IOM 12/04 7
1

GENERAL PRECAUTIONS
s
!WARNING
Personal injuries will result if procedures
outlined in this manual are not followed.
As!NEVER operate pump without coupling
guard correctly installed.
AD
NEVER operate pump beyond the rated
conditions to which the pump was sold.
AD
NEVER start pump without proper prime
(sufficient liquid in pump casing).
AD
NEVER run pump below recommended
minimum flow or when dry.
CBALWAYS lock out power to the driver before
performing pump maintenance.
CNEVER operate pump without safety devices
installed.
AC
NEVER operate pump with discharge valve
closed.
AD
NEVER operate pump with suction valve
closed.
ADO NOT change conditions of service
without approval of an authorized Goulds
representative.
EXPLOSION PREVENTION
!In order to reduce the possibility of accidental explosions in atmospheres containing explosive
gasses and/or dust, the instructions under the ATEX symbol must be closely followed. ATEX
certification is a directive enforced in Europe for non-electrical and electrical equipment installed in
Europe. ATEX requirements are not restricted to Europe, and are useful guidelines for equipment
installed in any potentially explosive environment.
SPECIAL ATEX CONSIDERATIONS
All installation and operation instructions in this
manual must be strictly adhered to. In addition, care
must be taken 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. maintining proper bearing lubrication
3. ensuring that the pump is operated in the
intended hydraulic range
83700-10th IOM 12/04

ATEX IDENTIFICATION
For a pumping unit (pump, seal, coupling, motor and
pump accessories) to be certified for use in an ATEX
classified environment, the proper ATEX identification
must be present. The ATEX tag will be secured to the
pump or the baseplate on which it is mounted. A
typical tag will 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 following table 1)
Table 1
Code
Max permissible
surface temperature,
°F (°C)
Max permissible
liquid temperature,
°F (°C)
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
should be in accordance with the specified area
where the equipment will be installed. If it is not,
please contact your ITT/Goulds representative before
proceeding.
INTENDED USE
The ATEX conformance is only applicable when the
pump unit is operated within its intended use. All
instructions within this manual must be followed at all
times. Operating, installing or maintaining the pump
unit in any way that is not covered in this manual 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.
If there is any question regarding the intended use of
the equipment please contact an ITT/Goulds
representative before proceeding.
CONDITION MONITORING
!For additional safety precautions, and where
noted in this manual, condition monitoring
devices should be used. This includes, but is
not limited to:
•Pressure gauges
•Flow meters
•Level indicators
•Motor load readings
•Temperature detectors
•Bearing monitors
•Leak detectors
•PumpSmart control system
For assistance in selecting the proper instrumentation
and its use, please contact your ITT/Goulds
representative.
3700-10th IOM 12/04 9

10 3700-10th IOM 12/04

GENERAL INFORMATION
PUMP DESCRIPTION.............................11
NAMEPLATE INFORMATION.........................12
RECEIVING THE PUMP ............................13
Storage Requirements ...........................13
Handling ..................................13
PUMP DESCRIPTION
The Model 3700 is a high pressure, high temperature
centrifugal pump that meets the requirements of
API Standard 610 10th Edition (ISO 13709).
The model is based on 6 power ends and 38 hydraulic
pump sizes.
Casing - The casing is a centerline mounted design.
The gasket is fully confined. ANSI Class 300 raised
face serrated flanges are standard; ANSI Class 300
flat face serrated and ring joint flanges are available.
Also available are ANSI class 600 flanges in the same
types.
Impeller - The impeller is fully enclosed and key
driven by the shaft. An impeller bolt with lockwasher
or impeller nut with locking set screw prevents axial
movement.
Seal Chamber Cover - The Model 3700 seal
chamber cover meets API 682 2nd Edition
dimensions for improved performance of mechanical
seals.
Power End - Ring oil lubricated bearings are
standard. The power end is sealed with labyrinth
seals. Pure and purge oil mist lubrication are options.
Some machining is required to convert from ring oil
lubrication to oil mist.
Shaft - The standard shaft is machined and ground to
comply with API 610 10th Edition (ISO 13709) criteria.
Bearings - The inboard (radial) bearing carries only
radial load; it is free to float axially in the frame. The
outboard (thrust) bearing is shouldered and locked to
the shaft and retained in the bearing frame to enable
it to carry radial and thrust loads. All fits are precision
machined to industry standards. The inboard bearing
is a single row deep groove ball bearing. The
outboard bearing is a duplex angular contact bearing,
which uses a pair of single row angular contact ball
bearings mounted back-to-back.
Baseplate - The fabricated steel baseplate is
designed to support the pump, driver and accessories
in accordance with API-610 10th Edition (ISO 13709)
requirements.
Direction of Rotation - Counterclockwise (left hand)
as viewed from the driver, looking at the pump shaft.
3700-10th IOM 12/04 11
2

NAMEPLATE INFORMATION
Every pump has a Goulds nameplate that provides
information about the pump. The nameplate is located
on the pump casing.
Special tags which provide additional information
(mechanical seal data, etc.) and special tagging
required by customers are located on the pump
casing or on the bearing frame.
The standard nameplate provides information about
the pump’s size, rating, bearings, serial number,
hydrostatic test pressure of pressure containment
parts, maximum allowable working pressure at
designated temperature and construction / customer’s
item number. Rating and hydrostatic test pressure
are expressed in English units. Note the format of
pump size: Discharge x Suction - Nominal Impeller
Diameter in inches, for example, 2x3-13 (Fig. 1).
The standard nameplate is also available in a version
which expresses the rating and hydrostatic test
pressure in metric units (Fig. 2).
When ordering spare parts you will need to identify
pump model, size, serial number, and the item
number of required parts. Pump information can be
taken from the Goulds nameplate. Item numbers can
be found in this manual.
NOTE: If applicable, your pump unit may have the following ATEX tag affixed to the pump and/or baseplate.
See the Safety section for a description of the symbols and codes.
12 3700-10th IOM 12/04
Fig. 1
Fig. 2

RECEIVING THE PUMP
Inspect the pump as soon as it is received. Carefully
check that everything is in good order. Make notes of
damaged or missing items on the receipt and freight
bill. File any claims with the transportation company
as soon as possible.
STORAGE REQUIREMENTS
Short Term (Less than 6 months)
Goulds normal packaging procedure is designed to
protect pump during shipping. Upon receipt, store in a
covered and dry location.
Long Term (More than 6 months)
Preservative treatment of bearings and machined
surfaces will be required. Rotate shaft several times
every 3 months. Refer to driver and coupling
manufacturers for their long term storage procedures.
Store in a covered and dry location.
NOTE: Long term storage treatment may be
purchased with initial pump order.
HANDLING
s
!WARNING
Pump and components are heavy. Failure to
properly lift and support equipment could result
in serious physical injury, or damage to pumps.
Use care when moving pumps. Lifting equipment
must be able to adequately support the entire
assembly. Hoist bare pump using suitable slings
under the outboard end of the bearing frame and under
the suction flange (Fig. 3).
Baseplate mounted units with or without drivers are
moved with slings through the baseplate’s lifting lugs
(Fig. 4 & 5).
3700-10th IOM 12/04 13
Fig. 3
Fig. 4
Fig. 5
2

14 3700-10th IOM 12/04

INSTALLATION
GENERAL ...................................15
SITE/FOUNDATION..............................15
BASEPLATE INSTALLATION PROCEDURE.................16
Baseplate Preparation ...........................16
Foundation Preparation ..........................16
Setting and Leveling Baseplate.......................16
ALIGNMENT AND ALIGNMENT CRITERIA .................17
General Considerations ..........................17
Alignment Criteria .............................17
ALIGNMENT TROUBLESHOOTING.....................18
BASEPLATE GROUTING PROCEDURE ...................18
General Procedure .............................18
Alignment Check ..............................18
PIPING.....................................19
Suction Piping...............................19
Discharge Piping..............................20
Bypass Piping ...............................20
Auxiliary Piping...............................20
Final Piping Check .............................20
!NOTE: Equipment that will operate in a potentially explosive environment must be installed in
accordance with the following instructions.
GENERAL
Procedures for installation described within this section
are general in nature. It is assumed that the installer
has a basic knowledge of acceptable methods. More
detailed procedures are described in various publi-
cations, including API Recommended Practice 686/
PIP (Process Industry Practices) REIE 686,
“Recommended Practices for Machinery Installation
and Installation Design.”
SITE/FOUNDATION
A pump should be located near the supply of liquid
and have adequate space for operation, maintenance,
and inspection. Be sure to allow for crane or hoist
service.
Baseplate mounted pumps are normally grouted on a
concrete foundation which has been poured on a
solid footing. The foundation must be able to absorb
any vibration and to form a permanent, rigid support
for the pumping unit.
3700-10th IOM 12/04 15
3

!NOTE: All equipment being installed must be
properly grounded to prevent unexpected
static electric discharge.
The location and size of foundation bolts are shown
on the outline assembly drawing provided with the
pump data package.
Foundation bolts commonly used are sleeve type
(Fig. 6) and J type. If using the sleeve type, the inside
diameter of the sleeve should be 2 1/2 - 3 times the bolt
diameter. A washer should be placed between the bolt
head and the sleeve. Both foundation bolt types permit
movement for final bolt adjustment.
BASEPLATE INSTALLATION PROCEDURE
Industry standard procedures, such as API RP 686/
PIP REIE 686, and/or the following procedure should
be followed prior to grouting the baseplate. The
procedure assumes the installer has a basic
knowledge of baseplate and foundation design and
installation methods.
BASEPLATE PREPARATION
1. Inspect all surfaces of baseplate that will contact
grout for contamination (e.g. - rust, oil, grime, etc.).
2. Thoroughly clean all surfaces of the baseplate
that will contact grout with a cleaner that will not
leave any residue.
NOTE: It may be necessary to sandblast the
contact surfaces and coat with a primer compati-
ble with the grout. If sandblasting is necessary,
remove all equipment prior to sandblasting.
3. Inspect all machined surfaces for burrs, rust, paint
or any other type of contamination. If necessary,
use a honing stone to remove burrs.
FOUNDATION PREPARATION
1. Chip top of foundation a minimum of 25 mm
(1.0 in.) to remove porous or low strength
concrete. If using a pneumatic hammer, assure
that it is not contaminating the surface with oil,
moisture, etc.
$CAUTION
Do not use heavy tools such as jackhammers,
as they could damage the structural integrity of
the foundation.
2. Remove water and/or debris from foundation bolt
holes/sleeves. If the sleeve type bolts are being
used, fill the sleeves with nonbinding moldable
material and seal to prevent grout from entering.
3. Coat exposed portion of anchor bolts with a
non-bonding compound such as paste wax to
prevent grout from adhering to anchor bolts.
NOTE: Do not use oils or liquid wax.
4. If recommended by grout manufacturer, coat
foundation surface with a compatible primer.
SETTING AND LEVELING BASEPLATE
1. Lower baseplate carefully onto foundation bolts
(Fig. 7).
2. Use leveling (jack) screws to raise bottom edge of
the baseplate 25 - 50 mm (1-2 in.) above
foundation to allow for adequate grouting. This
will provide even support for the baseplate once it
is grouted.
3. Level baseplate to within 0.20 mm/m (.002 in./ft.)
of length or width of the baseplate, respectively,
by adjusting leveling screws. Maximum total
variation from one end or side of the baseplate to
the other is 0.38 mm (.015 in.).
16 3700-10th IOM 12/04
Fig. 6
Fig. 7

Equipment mounting surfaces should be utilized
to establish level.
4. Coat portions of leveling screws that will contact
grout with a non-bonding compound such as
paste wax to facilitate their removal after grouting.
NOTE: Do not use oils or liquid wax.
5. Thread nuts on foundation bolts and hand tighten.
ALIGNMENT AND ALIGNMENT CRITERIA
!NOTE: Alignment procedures must be
followed to prevent unintended contact of
rotating parts. Follow coupling
manufacturer's installation and operation
procedures.
GENERAL CONSIDERATIONS
s
!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.
To remove coupling guard, refer to coupling guard
installation and disassembly instructions in Appendix I.
The times at which alignment is checked and adjusted
are:
Initial Alignment (Cold Alignment) is done prior to
operation when the pump and the driver are at
ambient temperatures.
•Before Grouting Baseplate - To ensure
alignment can be obtained.
•After Connecting Piping and Grouting
Baseplate - To ensure pipe strains haven’t
altered alignment.
Final Alignment (Hot Alignment) is done after
operation when the pump and driver are at operating
temperatures.
•After First Run - To obtain correct alignment
when both pump and driver are at operating
temperature. Thereafter, alignment should be
checked periodically in accordance with plant
operating procedures.
NOTE: Alignment check must be made if
process temperature changes, piping changes
and/or pump service is performed.
Alignment is achieved by adding or removing shims
from under the driver and/or shifting driver horizontally
as needed.
NOTE: Proper alignment is the responsibility
of the installer and user of the unit.
Accurate alignment of the equipment must be
attained. Trouble-free operation can be accomplished
by achieving alignment within the levels specified in
the following section.
Three common alignment methods are utilized:
•Reverse Dial Indicator method is most common.
•Laser method is similar to reverse dial
indicator method, but uses a laser to obtain the
necessary measurements.
•Dial Indicator (rim-and-face) method.
Follow alignment equipment manufacturers’
procedures when utilizing reverse dial indicator or
laser methods. A detailed procedure for alignment
using the dial indicator (rim-and-face) method is
included as Appendix II.
ALIGNMENT CRITERIA
Good alignment is attained when readings as specified in
this section have been achieved with pump and driver at
operating temperatures (final alignment).
Table 1 shows maximum allowable Total Indicator
Reading (T.I.R.) for parallel and angular misalignment.
Table 1
Maximum Allowable
Parallel and Angular Misalignment
Group
Maximum Allowable Misalignment
Parallel Angular
All 0.05 mm
(.002 in.)
0.03 degrees
[0.125 mm/cm
(.0005 in. /in.) of cou-
pling face
diameter]
NOTE A: For electric motors, motor shaft initial
(cold) parallel vertical alignment setting should be
0.05 - 0.10 mm (.002-.004 in.) lower than pump
shaft.
NOTE B: For other drivers (turbines, engines, etc.),
follow driver manufacturers’ recommendations.
3700-10th IOM 12/04 17
3

ALIGNMENT TROUBLESHOOTING
BASEPLATE GROUTING PROCEDURE
GENERAL PROCEDURE
Use of non-shrink epoxy grout is recommended.
NOTE: Grout manufacturer’s instructions
should be consulted and followed.
The following are general procedures for grouting
baseplates. Additional information may be found in
API Standard 610, 8th Edition, Appendix L, API
RP 686, Chapter 5, and other industry standards.
Baseplate Installation Procedure should be followed
prior to grouting baseplate.
1. Build dam (form) around foundation to level of
bottom of baseplate (Fig. 8).
2. Pour grout through grout hole in baseplate, up to
level of dam. Remove air bubbles from grout as it
is poured by puddling or by pumping the grout into
place.
3. Strike along top of dam with trowel to give a neat
finished appearance.
4. Allow grout to set.
5. Fill remainder of baseplate with grout, removing
air as before (Fig. 9).
6. Allow grout to set at least 48 hours. Leveling
screws should be removed when grout has
hardened.
7. Tighten foundation bolts.
ALIGNMENT CHECK
Re-check alignment before continuing, using criteria
previously stated.
18 3700-10th IOM 12/04
Fig. 8
Fig. 9
Problem Probable Cause Remedy
Cannot obtain horizontal (Side-to-Side)
alignment, angular or parallel
Driver feet bolt bound. Loosen pump hold down bolts and slide pump
and driver until horizontal alignment is achieved.
Baseplate not leveled
properly, probably twisted.
Determine which corner(s) of the baseplate are
high or low and adjust leveling screws at the
appropriate corner(s) and realign.
Cannot obtain vertical (Top-to-Bottom) alignment,
angular or parallel
Baseplate not leveled
properly, probably bowed.
Determine if center of baseplate should be raised or
lowered and correct by adjusting leveling screws
equally at the center of the baseplate.

PIPING
Guidelines for piping are given in the “Hydraulic
Institute Standards,” available from:
Hydraulic Institute
30200 Detroit Road
Cleveland, OH 44145-1967
and in API RP 686, and must be reviewed prior to
pump installation.
s
!WARNING
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 affect the operation
of the pump resulting in physical injury and
damage to the equipment.
!NOTE: Flange loads from the piping system,
including those from thermal expansion of
the piping, must not exceed the limits of the
pump. Casing deformation can result in
contact with rotating parts which can result
in excess heat generation, sparks and
premature failure.
1. Piping runs should be as short as possible to
minimize friction losses.
2. It is suggested that expansion loops be properly
designed and installed in suction and/or discharge
lines when handling liquids at elevated
temperatures, so thermal expansion of piping will
not draw pump out of alignment.
3. The piping should be arranged to allow pump
flushing prior to removal of the unit on services
handling hazardous liquids.
4. Carefully clean all pipe parts, valves and fittings,
and pump branches prior to assembly.
5. All piping must be supported independently of,
and line up naturally with, the pump flanges.
Table 2 shows piping flange alignment criteria.
Table 2
Piping Flange Alignment
Type Criteria
Axial Flange gasket thickness ± 0.8 mm (.03 in.).
Parallel 0.001 mm/mm (.001 in./in.) of flange diameter
to a maximum of 0.8 mm (.03 in.).
Concentric Flange bolts should easily install by hand.
In no case should loads on the pump flanges
exceed the limits stated in API Standard 610,
10th Edition (ISO 13709).
6. Piping must not be connected to the pump until
the grout has thoroughly hardened and the
foundation bolts, as well as driver and pump hold-
down bolts, have been tightened.
SUCTION PIPING
$ACAUTION
NPSHAmust always exceed NPSHRas shown
on Goulds performance curves received with
order. (Reference Hydraulic Institute for NPSH
and pipe friction values needed to evaluate
suction piping).
Properly designed and installed suction piping is a
necessity for trouble-free pump operation. Suction piping
should be flushed BEFORE connection to the pump.
1. Use of elbows close to the pump suction flange
should be avoided. There should be a minimum
of two (2) pipe diameters of straight pipe [five (5)
pipe diameters is preferred] between the elbow
and suction inlet. Where used, elbows should be
long radius.
2. Use suction pipe one (1) or two (2) sizes larger
than the pump suction, with a reducer at the
suction flange. Suction piping should never be of
smaller diameter than the pump suction.
3. Reducers, if used, should be eccentric and
located at the pump suction flange with sloping
side down.
$!!!CAUTION
Pump must never be throttled on suction side.
4. A suction screen should be installed prior to initial
start-up and when suction system has been
opened for work. The screen should be of the
cone type with a net area equal to at least three
(3) times the cross sectional area of the suction
pipe. The mesh of the screen should be sized to
prevent particles larger than 1.6 mm (1/16 in.)
from entering the pump and should be installed in
a spool piece to allow removal for cleaning. The
screen should remain in the system until periodic
inspection shows system is clean.
5. Separate suction lines are recommended when
more than one pump is operating from the same
source of supply.
3700-10th IOM 12/04 19
3

Suction Lift Conditions
1. Suction pipe must be free from air pockets.
2. Suction piping must slope upwards to pump.
3. All joints must be air tight.
4. A means of priming the pump must be provided.
Suction Head/Flooded Suction Conditions
1. An isolation valve should be installed in the
suction line at least two (2) pipe diameters from
the pump suction to permit closing of the line for
pump inspection and maintenance.
2. Keep suction pipe free from air pockets.
3. Piping should be level or slope gradually
downward from the source of supply.
4. No portion of the piping should extend below
pump suction flange.
5. The size of entrance from supply should be one
(1) or two (2) sizes larger than the suction pipe.
6. The suction pipe must be adequately submerged
below the liquid surface to prevent vortices and air
entrainment at the supply.
DISCHARGE PIPING
Properly designed and installed discharge piping is a
necessity for trouble-free pump operation. Discharge
piping should be flushed BEFORE connection to
the pump.
1. Isolation and check valves should be installed in
discharge line. Locate the check valve between
isolation valve and pump; this will permit
inspection of the check valve. The isolation valve
is required for priming, regulation of flow, and for
inspection and maintenance of pump. The check
valve prevents pump or seal damage due to
reverse flow through the pump when the driver is
turned off.
2. Increasers, if used, should be placed between
pump and check valves.
3. Cushioning devices should be used to protect the
pump from surges and water hammer if
quick-closing valves are installed in system.
BYPASS PIPING
Systems that require operation at reduced flows for
prolonged periods should be provided with a bypass
line connected from the discharge side (before any
valves) to the source of suction.
A minimum flow orifice can be sized and installed in
bypass line to preclude bypassing excessive flows.
Consult nearest sales office or factory for assistance
in sizing orifice.
An automatic recirculation control valve and/or
solenoid operated valve should be considered if a
constant bypass (i.e. orifice) is not possible.
AUXILIARY PIPING
!NOTE: The mechanical seal must have an
appropriate seal flush system. Failure to do
so will result in excess heat generation and
seal failure.
!NOTE: Cooling systems such as those for
bearing lubrication, mechanical seal
systems, etc, where provided, must be
operating properly to prevent excess heat
generation, sparks and premature failure.
!NOTE: Sealing systems that are not self
purging or self venting, such as plan 23,
require manual venting prior to operation.
Failure to do so will result in excess heat
generation and seal failure.
Auxiliary piping may be required for bearing cooling,
seal chamber cover cooling, mechanical seal flush or
other special features supplied with the pump.
Consult pump data sheet for specific auxiliary piping
recommendations.
If bearing cooling and/or seal chamber cover cooling is
required, follow guidelines listed below.
1. Flows of 4 l/min. (1 GPM) will generally satisfy
cooling requirements for each component. If both
bearing and seal chamber cover cooling are
provided, a minimum flow of 8 l/min. (2 GPM) will
be necessary.
2. Cooling water pressure should not exceed
7.0 kg/cm2(100 psig).
FINAL PIPING CHECK
After connecting the piping to pump:
!Rotate shaft by hand to ensure it rotates
smoothly and there is no rubbing which
could lead to excess heat generation and or
sparks.
!Check alignment, per alignment criteria
outlined previously, to determine if pipe
strain has affected alignment. If pipe strain
exists, correct piping.
20 3700-10th IOM 12/04