Gorman-Rupp Pumps 11-1-2A52-B User Manual

ACDE

OM-00615-OB02

April 2, 2002

Rev. A 12/03/02

INSTALLATION, OPERATION,

AND MAINTENANCE MANUAL

WITH PARTS LIST

10 SERIES PUMPS

MODEL

11 1/2A52−B

THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO

GORMAN-RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.

www.gormanrupp.com

eCopyright by the Gorman-Rupp Company

TABLE OF CONTENTS

INTRODUCTION PAGE I − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SAFETY - SECTION A PAGE A − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION − SECTION B PAGE B − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Dimensions PAGE B − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PREINSTALLATION INSPECTION PAGE B − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

POSITIONING PUMP PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lifting PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clearance PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SUCTION AND DISCHARGE PIPING PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Materials PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line Configuration PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connections to Pump PAGE B − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gauges PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SUCTION LINES PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fittings PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Strainers PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sealing PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Suction Lines In Sumps PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Suction Line Positioning PAGE B − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISCHARGE LINES PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Siphoning PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Valves PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bypass Lines PAGE B − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AUTOMATIC AIR RELEASE VALVE PAGE B − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Theory of Operation PAGE B − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air Release Valve Installation PAGE B − 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ALIGNMENT PAGE B − 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Coupled Drives PAGE B − 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V−Belt Drives PAGE B − 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATION − SECTION C PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PRIMING PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STARTING PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rotation PAGE C − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATION PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lines With a Bypass PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lines Without a Bypass PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leakage PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Liquid Temperature And Overheating PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Strainer Check PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Vacuum Check PAGE C − 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STOPPING PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cold Weather Preservation PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BEARING TEMPERATURE CHECK PAGE C − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOTING − SECTION D PAGE D − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

i

TABLE OF CONTENTS

(continued)

PUMP MAINTENANCE AND REPAIR - SECTION E PAGE E − 1. . . . . . . . . . . . . . . . .

STANDARD PERFORMANCE CURVE PAGE E − 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PARTS LIST:

Pump Model PAGE E − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E − 4. . . . . . . . . . . . . . . . . . . . . . . . .

Suction Check Valve Removal and Disassembly PAGE E − 4. . . . . . . . . . . . . . . . . . . . . . . . . . .

Back Cover Removal PAGE E − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Casing Removal PAGE E − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impeller Removal PAGE E − 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Removal and Disassembly PAGE E − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft and Bearing Removal and Disassembly PAGE E − 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft and Bearing Reassembly and Installation PAGE E − 6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Reassembly and Installation PAGE E − 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impeller Installation And Adjustment PAGE E − 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump Casing Installation PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Back Cover Installation PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Suction Check Valve Installation PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Final Pump Assembly PAGE E − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LUBRICATION PAGE E − 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearings PAGE E − 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Assembly PAGE E − 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Source PAGE E − 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii

OM−00615

10 SERIES

INTRODUCTION

Thank You for purchasing a Gorman-Rupp 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.

This Installation, Operation, and Maintenance
manual is designed to help you achieve the best

For information or technical assistance on the power source, contact the power source manufacturer’s local
dealer or representative.

If there are any questions regarding the pump or its application which are not covered in this manual or in
other literature accompanying this unit, please contact your Gorman-Rupp distributor, or write:

The Gorman-Rupp Company or Gorman-Rupp of Canada Limited
P.O. Box 1217 70 Burwell Road
Mansfield, Ohio 44901−1217 St. Thomas, Ontario N5P 3R7
Phone: (419) 755−1011 Phone: (519) 631−2870

The following are used to alert maintenance personnel to procedures which require special attention, to
those which could damage equipment, and to those which could be dangerous to personnel:

performance and longest life from your Gorman­Rupp pump.

This pump is a 10 Series, semi-open impeller, self­priming centrifugal model with a suction check
valve. The basic material of construction for wetted
parts is gray iron. The pump is designed for handl­ing most non-volatile, non-flammable liquids con­taining specified entrained solids.

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 severe personal injury
or death. These instructions describe
the procedure required and the injury
which could 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

Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

PAGE I − 1INTRODUCTION

OM−00615

10 SERIES

SAFETY - SECTION A

This information applies to 10 Series ba­sic pumps. Gorman-Rupp has no con­trol over or particular knowledge of the
power source which will be used. Refer
to the manual accompanying the power
source before attempting to begin oper­ation.

Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre­cautions for each specific application.
Therefore, it is the owner/installer’s re­sponsibility 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.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man­ual.

2. Disconnect or lock out the power
source to ensure that the pump will
remain inoperative.

3. Allow the pump to completely cool
if overheated.

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.

This pump is designed to handle most

non-volatile, non-flammable liquids
containing specified entrained solids.
Do not attempt to pump volatile or flam­mable liquids which may damage the
pump or endanger personnel as a result
of pump failure.

After the pump has been installed, 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
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.

This pump is designed 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.

PAGE A − 1SAFETY

OM−0061510 SERIES

Overheating may produce dangerous
fumes. Use extreme caution when vent­ing the pump, or when removing covers,
plates, plugs, or fittings.

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
parts can catch clothing, fingers, or
tools, causing severe injury to person­nel.

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.

Never run this pump backwards. Be cer­tain that rotation is correct before fully
engaging the pump.

PAGE A − 2 SAFETY

OM−00615 10 SERIES

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

OUTLINE DRAWING

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 Sec­tion E, Page 1).

For further assistance, contact your Gorman-Rupp
distributor or the Gorman-Rupp Company.

Pump Dimensions

See Figure B−1 for the approximate physical di­mensions of this pump.

Figure B−1. Pump Model 11 1/2A52−B

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 for cracks, dents, damaged

threads, and other obvious damage.

b. Check for and tighten loose attaching hard-

ware. Since gaskets tend to shrink after dry­ing, check for loose hardware at mating sur­faces.

PAGE B − 1INSTALLATION

OM−0061510 SERIES

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.

Only operate this pump in the direction in­dicated by the arrow on the pump body
and on the accompanying decal. Other­wise, the impeller could become loosened
from the shaft and seriously damage the
pump. Refer to ROTATION in
OPERATION, Section C.

d. Check levels and lubricate as necessary. Re-

fer to LUBRICATION in the MAINTENANCE
AND REPAIR section of this manual and per­form duties as instructed.

e. If the pump has 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 re-
placed to ensure maximum pump service.

and move the unit are improperly wrapped
around the pump.

Mounting

Locate the pump in an accessible place as close as
practical to the liquid being pumped. Level mount­ing is essential for proper operation.

The pump may have to be supported or shimmed
to provide for level operation or to eliminate vibra­tion.

Clearance

A minimum clearance of 18 inches in front of the
cover plate is required to permit removal of the cov­er and easy access to the pump interior.

SUCTION AND DISCHARGE PIPING

Pump performance is adversely effected by in­creased suction lift, discharge elevation, and fric­tion losses. See the performance curve on Page
E-1 to be sure your overall application allows pump
to operate within the safe operation range.

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.

POSITIONING PUMP

Lifting

Use lifting equipment with a capacity of at least 350
pounds (147 kg). This pump weighs approxi-

mately 65 pounds (30 kg), not including the
weight of accessories, base and power source.
Customer installed equipment such as suction and
discharge piping must be removed before at­tempting to lift.

The pump assembly can be seriously
damaged if the chains or cables used to lift

Materials

Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatible with the liquid being pumped. If hose is
used in suction lines, it must be the rigid-wall, rein­forced type to prevent collapse under suction. Us­ing piping couplings in suction lines is not recom­mended.

Line Configuration

Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini­mum use of elbows and fittings, which substan­tially increase friction loss. If elbows are necessary,
use the long-radius type to minimize friction loss.

Connections to Pump

Before tightening a connecting flange, align it ex­actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou­plings.

PAGE B − 2 INSTALLATION

OM−00615 10 SERIES

Lines near the pump must be independently sup­ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose-type
lines are used, they should have adequate support
to secure them when filled with liquid and under
pressure.

Gauges

Most pumps are drilled and tapped for installing
discharge pressure and vacuum suction gauges. If
these gauges are desired for pumps that are not
tapped, drill and tap the suction and discharge
lines not less than 18 inches (457,2 mm) from the
suction and discharge ports and install the lines.
Installation closer to the pump may result in erratic
readings.

SUCTION LINES

To avoid air pockets which could affect pump prim­ing, the suction line must be as short and direct as
possible. When operation involves a suction lift, the
line must always slope upward to the pump from
the source of the liquid being pumped; if the line
slopes down to the pump at any point along the
suction run, air pockets will be created.

Fittings

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.

This pump is designed to handle up to 1 inch (25,4
mm) diameter spherical solids.

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.

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.

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

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 B−2
shows recommended minimum submergence vs.

velocity.

PAGE B − 3INSTALLATION

OM−0061510 SERIES

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).

Figure B−2. Recommended Minimum Suction Line Submergence vs. Velocity

DISCHARGE LINES

Siphoning

Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si­phon breaker is used in the line. Otherwise, a si­phoning action causing damage to the pump
could result.

Valves

If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.

A check valve in the discharge line is normally rec­ommended, but it is not necessary in low dis­charge head applications.

With high discharge heads, it is recommended that
a throttling valve and a system check valve be in­stalled in the discharge line to protect the pump
from excessive shock pressure and reverse rota­tion when it is stopped.

If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.

Bypass Lines

Self-priming pumps are not air compressors. Dur­ing the priming cycle, air from the suction line must
be vented to atmosphere on the discharge side. If
the discharge line is open, this air will be vented
through the discharge. However, if a check valve
has been installed in the discharge line, the dis­charge side of the pump must be opened to atmos­pheric pressure through a bypass line installed be-

PAGE B − 4 INSTALLATION