Repair manual | AC International SELF-PRIMING CENTRIFUGAL PUMPS Heat Pump User Manual

PUBLICATION NUMBER OM -- 04760
December 2, 1998
Rev. A 11-20-03
SELF-PRIMING
CENTRIFUGAL PUMPS
THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED
D ST. THOMAS, ONTARIO, CANADA
eCopyright by the Gorman-Rupp Company
Printed in U.S.A.
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
INTRODUCTION
Thank You for purchasing a Gorman-Rupp SelfPriming Centrifugal Pump. Read this manual
carefully to learn how to safely install and operate
your pump. Failure to do so could result in personal
injury or damage to the pump.
A set of three manuals accompanies your pump.
Each set consists of three parts; the Installation/
Operation Manual contains essential information
on installing and operating the pumps. However,
since pump installations are seldom identical,
some of the information only summarizes general
recommendations and practices required to inspect, position, and arrange the pump and piping.
The Parts List Manual provides performance
curve(s), a pump model cross-section drawing,
and parts list for your pump.
structions and precautions for every aspect of
each specific application. Therefore, it is the responsibility of the owner/installer of the pump to
ensure that applications not addressed in this
manual are performed only after establishing that
neither operator safety nor pump integrity are compromised by the installation. Pumps and related
equipment must be installed and operated according to all national, local and industry standards.
If there are any questions regarding the pump
which are not covered in this manual or in other literature accompanying the unit, please contact
your Gorman-Rupp distributor or the GormanRupp Company:
The Maintenance and Repair Manual provides
troubleshooting and maintenance instructions required to properly diagnose operational problems,
and to service the pump components.
Because pump installations are seldom identical,
this manual cannot possibly provide detailed in-
The Gorman-Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-- 1217
or:
Gorman-Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
CONTENTS
SAFETY -- SECTION A
INSTALLATION -- SECTION B
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PREINSTALLATION INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POSITIONING PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SUCTION AND DISCHARGE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUTOMATIC AIR RELEASE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATION -- SECTION C
PRIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STARTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STOPPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BEARING TEMPERATURE CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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PAGE C
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INTRODUCTION
PAGE I -- 1
SELF-PRIMING CENTRIFUGAL PUMPS
RECORDING MODEL AND
SERIAL NUMBERS
Please record the pump model and serial number
in the spaces provided below. Your Gorman-Rupp
distributor needs this information when you require
parts or service.
Pump Model:
Serial Number:
OM -- 04760
WARRANTY INFORMATION
The warranty provided with your pump is part of
Gorman-Rupp’s support program for customers
who operate and maintain their equipment as described in this and the other accompanying literature. Please note that should the equipment be
abused or modified to change its performance beyond the original factory specifications, the warranty will become void and any claim will be denied.
The following are used to alert personnel to procedures which require special attention, to those which
could damage equipment, and to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure required and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product or
property damage. These instructions describe the requirements and the possible
damage which could result from failure to
follow the procedure.
NOTE
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
PAGE I -- 2
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.
INTRODUCTION
SELF-PRIMING CENTRIFUGAL PUMPS
OM -- 04760
SAFETY - SECTION A
This information applies to G-R SelfPriming Centrifugal pumps. These
pumps are available as basic, pedestalmounted models or as close-coupled
models driven by either an electric motor, gasoline or diesel engine. Refer to
the manual accompanying the power
source before attempting to begin operation.
This manual will alert personnel to
known procedures which require special attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. However, this manual cannot possibly anticipate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit. Therefore, it is the responsibility of
the owner/maintenance personnel to
ensure that only safe, established maintenance procedures are used, and that
any procedures not addressed in this
manual are performed only after establishing that neither personal safety nor
pump integrity are compromised by
such practices.
In addition to this manual, see the separate literature covering maintenance
and repair, pump parts, and any optional
equipment shipped with the pump.
Before attempting to open or service the
pump:
1. Familiarize yourself with this manual.
2. Disconnect or shut down the power source and take necessary precautions to ensure that the pump
will remain inoperative.
3. Allow the pump to completely cool
if overheated.
SAFETY
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cautiously.
7. Drain the pump.
Do not attempt to pump any liquids the
pump has not been designed for, and
which may damage the pump or endanger personnel as a result of pump failure. Consult the factory to determine
compatibility between the pump and liquid.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or damage to equipment. Suction and discharge hoses and piping must be removed from the pump before lifting.
After the pump has been positioned,
make certain that the pump and all piping or hose connections are tight, properly supported and secure before operation.
Do not operate the pump against a
closed discharge valve for long periods
of time. If operated against a closed discharge valve, pump components will
deteriorate, and the liquid could come
PAGE A -- 1
OM -- 04760
to a boil, build pressure, and cause the
pump casing to rupture or explode.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an overheated pump. Vapor pressure within the
pump can cause parts being disengaged to be ejected with great force. Allow the pump to cool before servicing.
These pumps may be used to handle
products which if overheated could produce dangerous fumes. Use extreme
caution when venting the pump, or
when removing covers, plates, plugs, or
fittings.
Never run this pump backwards. Be certain that rotation is correct before fully
engaging the pump.
If the pump is used to pump materials
which could cause serious illness or injury through direct exposure or emitted
fumes, wear protective clothing, such
as rubber gloves, face mask, and rubber
apron, as necessary before disassembling the pump or piping.
Do not operate the pump without
shields and/or guards in place over the
drive shafts, belts, and/or couplings, or
other rotating parts. Exposed rotating
PAGE A -- 2
SELF-PRIMING CENTRIFUAL PUMPS
parts can catch clothing, fingers, or
tools, causing severe injury to personnel.
If the pump is powered by an electric
motor, do not operate a non-explosion
proof motor in an explosive atmosphere. An explosion, which may cause
severe personal injury or death, could
result. Install, connect and operate the
motor in accordance with the National
Electric Code and all local codes. If
there is a conflict between the instructions in the manual accompanying the
unit and the National Electric Code or
applicable local code, the National or
Local code shall take precedence. All
electrical equipment supplied with the
pump conforms to applicable federal
regulations and national codes in effect
on the date of manufacture.
If the pump is electric motor driven, the
electrical power used to operate this
pump is high enough to cause injury or
death. Obtain the services of a qualified
electrician to troubleshoot, test and/or
service the electrical components of
this pump.
If the pump is powered by an internal
combustion engine, do not operate in
an explosive atmosphere. When operating internal combustion engines in an
enclosed area, make certain that exhaust fumes are piped to the outside.
These fumes contain carbon monoxide,
a deadly gas that is colorless, tasteless,
and odorless.
SAFETY
SELF-PRIMING CENTRIFUGAL PUMPS
OM -- 04760
uous operating speed for the pump is
shown on the performance curve (see
the Parts List Manual).
Fuel used by internal combustion engines presents an extreme explosion
and fire hazard. Make certain that all
fuel lines are securely connected and
free of leaks. Never refuel a hot or running engine. Avoid overfilling the fuel
tank. Always use the correct type of fuel.
Never tamper with the engine governor
to gain more power. The governor establishes safe operating limits that should
not be exceeded. The maximum contin-
SAFETY
If the pump is powered by an engine, the
engine exhaust from this product contains chemicals known to the State of
California to cause cancer, birth defects
or other reproductive harm.
Pumps and related equipment must be installed and operated according to all national, local and industry standards.
PAGE A -- 3
SELF-PRIMING CENTRIFUGAL PUMPS
OM -- 04760
INSTALLATION --- SECTION B
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this
section offers only general recommendations and
practices required to inspect, position, and arrange the pump and piping.
Most of the information pertains to a standard
static lift application where the pump is positioned
above the free level of liquid to be pumped.
If installed in a flooded suction application where
the liquid is supplied to the pump under pressure,
some of the information such as mounting, line
configuration, and priming must be tailored to the
specific application. Since the pressure supplied
to the pump is critical to performance and safety,
be sure to limit the incoming pressure to 50% of the
maximum permissible operating pressure as
shown on the pump performance curve (see Parts
List Manual). If the pump is fitted with a GormanRupp double grease lubricated seal, the maximum incoming pressure must be reduced to 10
p.s.i.
For further assistance, contact your Gorman-Rupp
distributor or the Gorman-Rupp Company.
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested before shipment from the factory. Before installation,
inspect the pump for damage which may have occurred during shipment. Check as follows:
a. Inspect the pump and power source (if so
equipped) for cracks, dents, damaged
threads, and other obvious damage.
b. Check for and tighten loose attaching hardware. Since gaskets tend to shrink after drying, check for loose hardware at mating surfaces.
c. Carefully read all tags, decals, and markings
on the pump assembly, and perform all duties
indicated. Note that the pump shaft rotates in
the required direction.
INSTALLATION
d. Check levels and lubricate as necessary. Refer to LUBRICATION in the MAINTENANCE
AND REPAIR section of this manual and any
other literature accompanying the unit and
perform duties as instructed.
e. If the pump and power source have been
stored for more than 12 months, some of the
components or lubricants may have exceeded their maximum shelf life. These must
be inspected or replaced to ensure maximum pump service.
If the maximum shelf life has been exceeded, or if
anything appears to be abnormal, contact your
Gorman-Rupp distributor or the factory to determine the repair or updating policy. Do not put the
pump into service until appropriate action has
been taken.
Battery Installation
If the pump is engine driven, the engine battery is
not included with the unit unless otherwise specified on the pump order. See the battery tag included with the battery box assembly for battery
specifications. Refer to information accompanying
the battery and/or electrolyte solution for activation
and charging instructions.
Before installing the battery, clean the positive and
negative cable connectors, and the battery terminals. Secure the battery by tightening the holddown brackets. The terminals and clamps may be
coated with petroleum jelly to retard corrosion.
Connect and tighten the positive cable first, then
the negative cable.
POSITIONING PUMP
Lifting
Use lifting equipment with a capacity of at least 5
times the weight of the pump, not including the
weight of accessories, wheel kit or optional equipment. Customer installed equipment such as suction and discharge pipingmust be removed before
attempting to lift.
PAGE B -- 1
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
PAGE B -- 2
INSTALLATION
SELF-PRIMING CENTRIFUGAL PUMPS
slopes down to the pump at any point along the
suction run, air pockets will be created.
Fittings
Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they
should be the eccentric type, and should be installed with the flat part of the reducers uppermost
to avoid creating air pockets. Valves are not normally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pockets.
Strainers
If a strainer is furnished with the pump, be certain
to use it; any spherical solids which pass through a
strainer furnished with the pump will also pass
through the pump itself.
If a strainer is not furnished with the pump, but is
installed by the pump user, make certain that the
total area of the openings in the strainer is at least
three or four times the cross section of the suction
line, and that the openings will not permit passage
of solids larger than the solids handling capability
of the pump.
Refer to the Specification Data sheet for the spherical solids handling capability of your specific pump
model.
Sealing
Since even a slight leak will affect priming, head,
and capacity, especially when operating with a
high suction lift, all connections in the suction line
should be sealed with pipe dope to ensure an airtight seal. Follow the sealant manufacturer’s recommendations when selecting and applying the
pipe dope. The pipe dope should be compatible
with the liquid being pumped.
INSTALLATION
OM -- 04760
Suction Lines In Sumps
If a single suction line is installed in a sump, it
should be positioned away from the wall of the
sump at a distance equal to 1-1/2 times the diameter of the suction line.
If there is a liquid flow from an open pipe into the
sump, the flow should be kept away from the suction inlet because the inflow will carry air down into
the sump, and air entering the suction line will reduce pump efficiency.
If it is necessary to position inflow close to the suction inlet, install a baffle between the inflow and the
suction inlet at a distance 1-1/2 times the diameter
of the suction pipe. The baffle will allow entrained
air to escape from the liquid before it is drawn into
the suction inlet.
If two suction lines are installed in a single sump,
the flow paths may interact, reducing the efficiency
of one or both pumps. To avoid this, position the
suction inlets so that they are separated by a distance equal to at least 3 times the diameter of the
suction pipe.
Suction Line Positioning
The depth of submergence of the suction line is
critical to efficient pump operation. Figure 1 shows
recommended minimum submergence vs. velocity.
NOTE
The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at the
end of the suction line. The larger opening size will
reduce the inlet velocity. Calculate the required
submergence using the following formula based
on the increased opening size (area or diameter).
PAGE B -- 3
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
PAGE B -- 4
INSTALLATION
SELF-PRIMING CENTRIFUGAL PUMPS
minimize the chance of plugging.
In low discharge head applications (less than 30
feet or 9 meters), it is recommended that the bypass line be run back to the wet well, and located 6
inches below the water level or cut-off point of the
low level pump. In some installations, this bypass
line may be terminated with a six-to-eight foot
length of 1 1/4 inch I.D. smooth-bore hose; air and
liquid vented during the priming process will then
agitate the hose and break up any solids, grease,
or other substances likely to cause clogging.
A bypass line that is returned to a wet well
must be secured against being drawn into
the pump suction inlet.
It is also recommended that pipe unions be installed at each 90_ elbow in a bypass line to ease
disassembly and maintenance.
In high discharge head applications (more than
30 feet), an excessive amount of liquid may be bypassed and forced back to the wet well under the
full working pressure of the pump; this will reduce
overall pumping efficiency. Therefore, it is recommended that a Gorman-Rupp Automatic Air Release Valve be installed in the bypass line.
Gorman-Rupp Automatic Air Release Valves are
reliable, and require minimum maintenance. See
AUTOMATIC AIR RELEASE VALVE in this section
for installation and theory of operation of the Automatic Air Release Valve. Consult your GormanRupp distributor, or contact the Gorman-Rupp
Company for selection of an Automatic Air Release
Valve to fit your application.
If the installation involves a flooded suction such as
a below-ground lift station, a pipe union and manual shut-off valve may be installed in the bleed line to
allow service of the valve without shutting down the
station, and to eliminate the possibility of flooding.
If a manual shut-off valve is installed anywhere in
INSTALLATION
OM -- 04760
the air release piping, it must be a full-opening ball
type valve to prevent plugging by solids.
If a manual shut-off valve is installed in
a bypass line, it must not be left closed
during operation. A closed manual shutoff valve may cause a pump which has
lost prime to continue to operate without reaching prime, causing dangerous
overheating and possible explosive
rupture of the pump casing. Personnel
could be severely injured.
Allow an over-heated pump to cool before servicing. Do not remove plates,
covers, gauges, or fittings from an overheated pump. Liquid within the pump
can reach boiling temperatures, and vapor pressure within the pump can cause
parts being disengaged to be ejected
with great force. After the pump cools,
drain the liquid from the pump by removing the casing drain plug. Use caution when removing the plug to prevent
injury to personnel from hot liquid.
AUTOMATIC AIR RELEASE VALVE
When properly installed and correctly adjusted to
the specific hydraulic operating conditions of the
application, the Gorman-Rupp Automatic Air Release Valve will permit air to escape through the bypass line, and then close automatically when the
pump is fully primed and pumping at full capacity.
Theory of Operation
Figures 2 and 3 show a cross-sectional view of the
Automatic Air Release Valve, and a corresponding
description of operation.
PAGE B -- 5
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
liters per minute) will occur when the
valve is fully closed. Be sure the bypass
line is directed back to the wet well or
tank to prevent hazardous spills.
When the pump shuts down, the spring returns the
diaphragm to its original position. Any solids that
may have accumulated in the diaphragm chamber
settle to the bottom and are flushed out during the
next priming cycle.
Figure 2. Valve in Open Position
During the priming cycle, air from the pump casing
flows through the bypass line, and passes through
the Air Release Valve to the wet well (Figure 2).
NOTE
The valve will remain open if the pump does not
reach its designed capacity or head. Valve closing
pressure is dependent upon the discharge head of
the pump at full capacity. The range of the valve
closing pressure is established by the tension rate
of the spring as ordered from the factory. Valve closing pressure can be further adjusted to the exact
system requirements by moving the spring retaining pin up or down the plunger rod to increase or
decrease tension on the spring. Contact your Gorman-Rupp distributor or the Gorman-Rupp Company for information about an Automatic Air Release Valve for your specific application.
Figure 3. Valve in Closed Position
When the pump is fully primed, pressure resulting
from flow against the valve diaphragm compresses the spring and closes the valve (Figure 3).
The valve will remain closed, reducing the bypass
of liquid to 1 to 5 gallons (3.8 to 19 liters) per minute, until the pump loses its prime or stops.
Air Release Valve Installation
The Automatic Air Release Valve must be independently mounted in a horizontal position and
connected to the discharge line of the self-priming
centrifugal pump (see Figure 4).
NOTE
Some leakage (1 to 5 gallons or 3.8 to 19
PAGE B -- 6
If the Air Release Valve is to be installed on a staged
pump application, contact the factory for specific
installation instructions.
INSTALLATION
SELF-PRIMING CENTRIFUGAL PUMPS
INSTALLATION
OM -- 04760
PAGE B -- 7
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
When checking alignment, disconnect
the power source to ensure that the
pump will remain inoperative.
Adjusting the alignment in one direction
may alter the alignment in another direction. check each procedure after altering
alignment.
Coupled Drives
When using couplings, the axis of the power
source must be aligned to the axis of the pump
shaft in both the horizontal and vertical planes.
Most couplings require a specific gap or clearance
between the driving and the driven shafts. Refer to
the coupling manufacturer’s service literature.
Align spider insert type couplings by using calipers
to measure the dimensions on the circumference
of the outer ends of the coupling hub every 90 degrees. The coupling is in alignment when the hub
ends are the same distance apart at all points (see
Figure 5).
Figure 5. Aligning Spider-Type Couplings
Align non-spider type couplings by using a feeler
gauge or taper gauge between the coupling halves
every 90 degrees. The coupling is in alignment
when the hubs are the same distance apart at all
points (see Figure 6).
PAGE B -- 8
Figure 6. Aligning Non-Spider Type Couplings
Check parallel adjustment by laying a straightedge
across both coupling rims at the top, bottom, and
side. When the straightedge rests evenly on both
halves of the coupling, the coupling is in horizontal
parallel alignment. If the coupling is misaligned,
use a feeler gauge between the coupling and the
straightedge to measure the amount of misalignment.
V-Belt Drives
When using V-belt drives, the power source and
the pump must be parallel. Use a straightedge
along the sides of the pulleys to ensure that the pulleys are properly aligned (see Figure 7). In drive
systems using two or more belts, make certain that
the belts are a matched set; unmatched sets will
cause accelerated belt wear.
MISALIGNED:
SHAFTS
NOT PARALLEL
MISALIGNED:
SHAFTS
NOT IN LINE
ALIGNED: SHAFTS
PARALLEL AND
SHEAVES IN LINE
Figure 7. Alignment of V-Belt Driven Pumps
Tighten the belts in accordance with the belt manufacturer’s instructions. If the belts are too loose,
they will slip; if the belts are too tight, there will be
excessive power loss and possible bearing failure.
INSTALLATION
SELF-PRIMING CENTRIFUGAL PUMPS
OM -- 04760
Select pulleys that will match the proper speed ratio; overspeeding the pump may damage both
pump and power source.
Do not operate the pump without the
guard in place over the rotating parts.
exposed rotating parts can catch clothing, fingers, or tools, causing severe injury to personnel.
ELECTRICAL CONNECTIONS
If the pump is driven by an electric motor, check
that the electrical service available matches the
motor requirements stamped on the motor nameplate before connecting a motor to the incoming
power. Check that the motor speed meets pump
specifications.
If rotation is incorrect on a three-phase motor, have
a qualified electrician interchange any two of the
three phase wires to change direction. If rotation is
incorrect on a single-phase motor, consult the literature supplied with the motor for specific instructions.
INSTALLATION
The electrical power used to operate the
pump is high enough to cause injury or
death. Obtain the services of a qualified
electrician to make all electrical connections.
If the pump is powered by an electric
motor, do not operate a non-explosion
proof motor in an explosive atmosphere. An explosion, which may cause
severe personal injury or death, could
result. Install, connect and operate the
motor in accordance with the National
Electric Code and all local codes. If
there is a conflict between the instructions in the manual accompanying the
unit and the National Electric Code or
applicable local code, the National or
Local code shall take precedence. All
electrical equipment supplied with the
pump conforms to applicable federal
regulations and national codes in effect
on the date of manufacture.
PAGE B -- 9
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
OPERATION --- SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and decals attached to the pump.
Do not attempt to pump any liquids the
pump has not been designed for, and
which may damage the pump or endanger personnel as a result of pump failure.
Pump speed and operating conditions
must be within the performance range
shown on the curve in Parts Lists manual.
Add liquid to the pump casing when:
1. The pump is being put into service for the
first time.
2. The pump has not been used for a considerable length of time.
3. The liquid in the pump casing has evaporated.
Once the pump casing has been filled, the pump
will prime and reprime as necessary.
After filling the pump casing, reinstall
and tighten the fill plug. Do not attempt
to operate the pump unless all connecting piping is securely installed. Otherwise, liquid in the pump forced out
under pressure could cause injury to
personnel.
Refer to the pump Specification Data Sheet or the
accompanying Parts List Manual for the specific
performance for your pump.
To fill the pump, remove the pump casing fill cover
or fill plug in the top of the casing, and add clean
liquid until the casing is filled. Replace the fill cover
or fill plug before operating the pump.
PRIMING
STARTING
Install the pump and piping as described in INSTALLATION. Make sure that the piping connections are tight, and that the pump is securely
mounted. Check that the pump is properly lubricated (see LUBRICATION in the MAINTENANCE
AND REPAIR manual).
Starting procedures will vary slightly depending on
the pump application, type of priming device, and
type of drive. Consult the operations manual furnished with the power source.
The pump is self-priming, but it should never be operated unless there is liquid in the pump casing.
Never operate the pump unless there is liquid in the pump casing. The pump will not
prime when dry. Extended operation of a
dry pump will destroy the seal assembly.
OPERATION
Rotation
The correct direction of pump rotation is indicated
by an arrow on the pump body or accompanying
decals. If the pump is operated in the wrong direction, the impeller could become loosened from the
shaft and seriously damage the pump.
The pump must operate in the direction indicated by the arrow on the pump, or acPAGE C -- 1
OM -- 04760
companying decals. Reverse rotation
could loosen the impeller and seriously
damage the pump.
If the pump is driven by an electric motor, consult
the operating manual furnished with the motor before attempting to start the motor.
If rotation is incorrect on a three-phase motor, have
a qualified electrician interchange any two of the
three phase wires to change direction. If rotation is
incorrect on a single-phase motor, consult the literature supplied with the motor for specific instructions.
OPERATION
SELF-PRIMING CENTRIFUGAL PUMPS
sure which could damage pipe ends, gaskets,
sprinkler heads, and any other fixtures connected
to the line. When the discharge line is completely
filled, adjust the throttling valve to the required flow
rate.
Do not operate the pump against a
closed discharge throttling valve for
long periods of time. If operated against
a closed discharge throttling valve,
pump components will deteriorate, and
the liquid could come to a boil, build
pressure, and cause the pump casing to
rupture or explode.
Leakage
Pump speed and operating points must be
within the continuous performance range
shown on the pump curve. (See the Parts
List Manual accompanying the pump.)
No leakage should be visible at pump mating surfaces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maximum pump efficiency.
Lines With a Bypass
Liquid Temperature And Overheating
Close the discharge throttling valve (if so
equipped) so that the pump will not have to prime
against the weight of the liquid in the discharge
line. Air from the suction line will be discharged
through the bypass line back to the wet well during
the priming cycle. When the pump is fully primed
and liquid is flowing steadily from the bypass line,
open the discharge throttling valve. Liquid will then
continue to circulate through the bypass line while
the pump is in operation.
Refer to the Specification Data sheet for the maximum liquid temperature for your specific pump.
Do not apply the pump at a higher operating temperature.
Lines Without a Bypass
Open all valves in the discharge line and start the
power source. Priming is indicated by a positive
reading on the discharge pressure gauge or by a
quieter operation. The pump may not prime immediately because the suction line must first fill with
liquid. If the pump fails to prime within five minutes,
stop it and check the suction line for leaks.
After the pump has been primed, partially close the
discharge line throttling valve in order to fill the line
slowly and guard against excessive shock presPAGE C -- 2
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rupture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.
Allow an over-heated pump to completely cool before servicing. Do not remove plates, covers, gauges, or fittings
from an over-heated pump. Liquid within the pump can reach boiling temperatures, and vapor pressure within the
pump can cause parts being disengaged to be ejected with great force. AfOPERATION
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
ter the pump cools, drain the liquid from
the pump by removing the casing drain
plug. Use caution when removing the
plug to prevent injury to personnel from
hot liquid.
If overheating does occur, stop the pump immediately and allow it to cool before servicing it. Approach any overheated pump cautiously.
As a safeguard against rupture or explosion due to
heat, some pumps are equipped with a pressure
relief valve which will open if vapor pressure within
the pump casing reaches a critical point. It is recommended that the pressure relief valve assembly
be replaced at each overhaul, or any time the
pump casing overheats and activates the valve.
Never replace this valve with a substitute which
has not been specified or provided by the GormanRupp Company.
Strainer Check
If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been installed, monitor and record the readings regularly
to detect strainer blockage.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely necessary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve. If the pump is fitted with a Gorman-Rupp double grease lubricated seal, the maximum incoming pressure
must be reduced to 10 p.s.i.
check for air leaks in the seal, gasket, or discharge
valve.
Open the suction line, and read the vacuum gauge
with the pump primed and at operation speed.
Shut off the pump. The vacuum gauge reading will
immediately drop proportionate to static suction
lift, and should then stabilize. If the vacuum reading
falls off rapidly after stabilization, an air leak exists.
Before checking for the source of the leak, check
the point of installation of the vacuum gauge.
Operational Checks
Check the pump for proper operation when it is first
started and periodically thereafter to identify minor
problems.
Check the pump for unusual noises or excessive
vibration while it is operating. If noise or vibration is
excessive, stop the pump and refer to Troubleshooting in the Maintenance And Repair Manual
for possible causes.
To avoid serious damage to the pump,
check for unusual noises or excessive vibration while the pump is running. If noise
or vibration is excessive, stop operation
and refer to the troubleshooting chart in the
Maintenance and Repair manual.
STOPPING
Never halt the flow of liquid suddenly. If the liquid
being pumped is stopped abruptly, damaging
shock waves can be transmitted to the pump and
piping system. Close all connecting valves slowly.
On engine driven pumps, reduce the throttle
speed slowly and allow the engine to idle briefly before stopping.
Pump Vacuum Check
With the pump inoperative, install a vacuum gauge
in the system, using pipe dope on the threads.
Block the suction line and start the pump. At operating speed the pump should pull a vacuum of 20
inches (508 mm) or more of mercury. If it does not,
OPERATION
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
PAGE C -- 3
OM -- 04760
After stopping the pump, lock out or disconnect
the power source to ensure that the pump will remain inoperative.
Cold Weather Preservation
In below freezing conditions, drain the pump to
prevent damage from freezing. Also, clean out any
solids by flushing with a hose. Operate the pump
for approximately one minute; this will remove any
remaining liquid that could freeze the pump rotating parts. If the pump will be idle for more than a
few hours, or if it has been pumping liquids containing a large amount of solids, drain the pump,
and flush it thoroughly with clean water. To prevent
large solids from clogging the drain port and preventing the pump from completely draining, insert
a rod or stiff wire in the drain port, and agitate the
liquid during the draining process. Clean out any
remaining solids by flushing with a hose.
BEARING TEMPERATURE CHECK
Bearings normally run at higher than ambient temperatures because of heat generated by friction.
Temperatures up to 160_F (71_ C) are considered
normal for bearings, and they can operate safely to
at least 180_F (82_ C).
Checking bearing temperatures by hand is inaccurate. Bearing temperatures can be measured accurately by placing a contact-type thermometer
against the housing. Record this temperature for
future reference.
A sudden increase in bearing temperature is a
warning that the bearings are at the point of failing
to operate properly. Make certain that the bearing
lubricant is of the proper viscosity and at the correct level (see LUBRICATION in the Maintenance
And Repair manual). Bearing overheating can
also be caused by shaft misalignment and/or excessive vibration.
When pumps are first started, the bearings may
seem to run at temperatures above normal. Continued operation should bring the temperatures
down to normal levels.
PAGE C -- 4
SELF-PRIMING CENTRIFUGAL PUMPS
LUBRICATION
Do not remove plates, covers, gauges,
pipe plugs or fittings from an overheated pump. Vapor pressure within the
pump can cause parts being disengaged to be ejected with great force. Allow the pump to completely cool before
servicing.
On a new pump, check the oil level in the seal and
bearing cavities before initial startup, after the first
two weeks of operation, and every month thereafter.
Before installing or removing the lubrication plug,
always clean the area around the plug to prevent
contamination.
Self Lubricated Seal Assembly
The self lubricated seal assembly is lubricated by
the medium being pumped, or by a flow of fresh liquid from an external source. Flushing liquid may
be taken from the pump discharge and supplied
through auxiliary piping.
When handling abrasive or tacky liquids, supply
fresh lubricating liquid from an external source. Be
sure the liquid supplied to the seal is compatible
with the liquid being pumped, and that its flow is
controlled to prevent dilution. Consult the factory if
flushing is required.
Oil Lubricated Seal Assembly
Before starting the pump, remove the vented plug
and fill the seal cavity with SAE No. 30 non-detergent oil. Clean and reinstall the vented plug. Refer
to the Maintenance And Repair Manual for the
seal cavity oil capacity.
Grease Lubricated Seal Assembly
Fill the automatic grease cup through the grease
fitting with No. 2 lithium base grease until grease
escapes from the relief hole. Turn the grease cup
arm counterclockwise until it is at the top of the
OPERATION
OM -- 04760
SELF-PRIMING CENTRIFUGAL PUMPS
stem; this will release the spring to apply grease to
the seal.
Oil Lubricated Bearings
Bearing housings are fully lubricated when
shipped from the factory. Check the oil level regularly and maintain it at the desired level. When lubrication is required, add SAE No. 30 non-detergent
oil. Do not over-lubricate. Over-lubrication can
cause the bearings to over-heat, resulting in premature bearing failure.
Under normal conditions, drain the bearing housing once each year and refill with clean oil. Change
the oil more frequently if the pump is operated continuously or installed in an environment with rapid
temperature change.
Grease Lubricated Bearings
Bearing housings are fully lubricated when
shipped from the factory. Under normal conditions,
add No. 0 lithium base grease from a grease gun
through the grease fitting after each 250 hours of
operation or once each month, whichever comes
first. Do not over-lubricate. Over-lubrication can
cause the bearings to over-heat, resulting in premature bearing failure.
If there is no provision in the bearing cavity to drain
or flush the lubricant, the pump and bearing housing must be disassembled to completely clean and
maintain this cavity.
Under normal conditions, change the grease after
each 5000 hours of operation, or at 12 month intervals, whichever comes first. Change the grease
more frequently if the pump is operated continuously or installed in an environment where variable
hot and cold temperatures are common.
Refer to the Maintenance And Repair Manual for
grease capacity of the bearing housing for the
pump.
Monitor the condition of the bearing lubricant regularly for evidence of rust or moisture condensation. This is especially important in areas where variable hot and
cold temperatures are common.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
lubricant.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
oil.
Consult the literature supplied with the power
source, or contact your local power source representative.
OPERATION
Power Source
PAGE C -- 5
July 18, 1979
WARRANTY
Pumping units manufactured by The Gorman-Rupp Company,
Mansfield, Ohio are guaranteed to be free from defects in material and workmanship for one year from date of shipment from
factory in Mansfield, Ohio. The obligation under this Warranty,
statutory or otherwise, is limited to replacement or repair at
Mansfield, Ohio factory or at a point designated by GormanRupp, of such part as shall appear to us upon inspection at such
point, to have been defective in material or workmanship.
This Warranty does not obligate The Gorman-Rupp Company to
bear the cost of labor or transportation charges in connection
with replacement or repair of defective parts; nor shall it apply to
a pump upon which repairs or alterations have been made unless authorized by Gorman-Rupp.
No warranty is made in respect to engines, motors, or trade accessories, such being subject to warranties of their respective
manufacturers.
In Submersible Pumps, pump and motor are integral and Submersibles are warranted as a unit. Since motor is subject to an
important degree upon quality and performance of electrical
controls, unit warranty is valid only when controls have been
specified and provided by Gorman-Rupp.
No express implied or statutory warranty, other than herein set
forth is made or authorized to be made by Gorman-Rupp.
In no event shall The Gorman-Rupp Company be liable for consequential damages or contingent liabilities arising out of the failure of any Gorman-Rupp pump or parts thereof to operate properly.
THE GORMAN-RUPP COMPANY
Mansfield, Ohio
NOTE: In Canada, all above references to “The Gorman-Rupp
Company, Mansfield, Ohio” is understood to mean “GormanRupp of Canada Limited, St. Thomas, Ontario.”
THE GORMAN-RUPP COMPANY F MANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA
ECopyright by the Gorman-Rupp Company
Printed in U.S.A.
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