GORMAN-RUPP PUMPS U3B65-B User manual

OM-03200-OB01
May 31, 1988
Rev. E 04/23/02
CDO
THE GORMAN-RUPP COMPANY DMANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED DST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
ECopyright by the Gorman-Rupp Company
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
USERIESPUMP
MODEL
U3B65-B
INCLUDING: /F

TABLE OF CONTENTS
i
INTRODUCTION PAGE I --- 1.................................................
SAFETY --- SECT ION A PAGE A --- 1...........................................
INSTALLATION --- SECT ION B PAGE B --- 1....................................
Pump Dimensions PAGE B --- 1.....................................................
PREINSTALLATION INSPECTION PAGE B --- 2............................................
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 --- 3..............................................................
Line Configuration PAGE B --- 3......................................................
Connections to Pump PAGE B --- 3..................................................
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 --- 4.................................................
Suction Line Positioning PAGE B --- 4................................................
DISCHARGE LINES PAGE B --- 5........................................................
Siphoning PAGE B --- 5.............................................................
Valves PAGE B --- 5................................................................
Bypass Lines PAGE B --- 5..........................................................
AUTOMATIC AIR RELEASE VALVE PAGE B --- 6...........................................
Theory of Operation PAGE B --- 6....................................................
Air Release Valve Installation PAGE B --- 7............................................
ALIGNMENT PAGE B --- 8..............................................................
Coupled Drives PAGE B --- 8........................................................
V-Belt Drives PAGE B --- 9...........................................................
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 --- 3.........................................................
Pump Vacuum Check PAGE C --- 3..................................................
STOPPING PAGE C --- 3................................................................
Cold Weather Preservation PAGE C --- 3..............................................
BEARING TEMPERATURE CHECK PAGE C --- 4..........................................

TABLE OF CONTENTS
(continued)
ii
TROUBLESHOOTING --- SECTION D PAGE D --- 1..............................
PREVENTIVE MAINTENANCE PAGE D --- 3...............................................
PUMP MAINTENANCE AND REPAIR --- SECTION E PAGE E --- 1................
PERFORMANCE CURVE PAGE E --- 1...................................................
PARTS LISTS:
Pump Model PAGE E --- 3..........................................................
Repair Rotating Assembly PAGE E --- 5...............................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E --- 6.........................
Back Suction Cover And Wear Plate Removal PAGE E --- 6.............................
Rotating Assembly Removal PAGE E --- 7.............................................
Impeller Removal PAGE E --- 8......................................................
Seal Removal PAGE E --- 8..........................................................
Shaft and Bearing Removal and Disassembly PAGE E --- 8.............................
Shaft and Bearing Reassembly and Installation PAGE E --- 9............................
Seal Reassembly and Installation PAGE E --- 10........................................
Impeller Installation PAGE E --- 11.....................................................
Rotating Assembly Installation PAGE E --- 12...........................................
Suction Check Valve Installation PAGE E --- 12.........................................
Back Suction Cover Installation PAGE E --- 12..........................................
PRESSURE RELIEF VALVE MAINTENANCE PAGE E --- 13..................................
LUBRICATION PAGE E --- 13.............................................................
Seal Assembly PAGE E --- 13.........................................................
Bearings PAGE E --- 13..............................................................
Power Source PAGE E --- 13.........................................................

USERIES OM--03200
PAGE I -- 1INTRODUCTION
INTRODUCTION
This Installation, Operation, and Maintenance
manual is designed to help you achieve the best
performance and longest life from your Gorman-
Rupp pump.
This pump is a U Series, semi-open impeller, self-
priming centrifugal model. The pump is designed
for high-efficiency, self-priming service, and is ca-
pable of handling low pH resistance residues and
slurries containing specified entrained solids. The
basic material of construction for wetted parts is
grade CD4MCu stainless steel.
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
Forinformationortechnicalassistanceonthepowersource,contactthepowersourcemanufacturer’slocal
dealer or representative.
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:
Immediate hazards whichWILL result in
severe personal injury or death. These
instructions describe the procedure re-
quired 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.
HazardsorunsafepracticeswhichCOULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi-
ble damage which couldresult from failure
to follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

USERIES OM--03200
PAGE A -- 1SAFETY
SAFETY --- SECTION A
This information applies toU Seriesba-
sic pumps. Gorman-Rupp has no con-
trol 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.
Beforeattemptingtoopenorservicethe
pump:
1. Familiarize yourself with this man-
ual.
2. Disconnect or lock out the power
sourcetoensurethatthepumpwill
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 cau-
tiously.
7. Drain the pump.
Thispump isdesigned tohandle lowpH
resistance residues and slurries con-
taining specified entrained solids. Do
notattempttopumpvolatile,explosive
or flammable liquids which may dam-
age thepump orendanger personnel as
a result of pump failure.
After the pump has been positioned,
make certain that the pump and all pip-
ing connections are tight, properly sup-
ported and secure before operation.
Do not operate the pump without the
guards in place over the rotating parts.
Exposed rotating parts can catch cloth-
ing, fingers, or tools, causing severe in-
jury to personnel.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over-
heatedpump. Vaporpressure withinthe
pump can cause parts being disen-
gaged to be ejected with great force. Al-
low the pump to cool before servicing.
Do not operate the pump against a
closed discharge valve for long periods
oftime.Ifoperatedagainstacloseddis-
charge valve, pump components will
deteriorate, and the liquid could come
to a boil, build pressure, and cause the
pump casing to rupture or explode.

USERIESOM--03200
PAGE A -- 2 SAFETY
Neverrunthispumpbackwards.Becer-
tain that rotation is correct before fully
engaging the pump.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.

OM--03200USERIES
PAGE B -- 1INSTALLATION
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 ar-
range the pump and piping.
Most of the information pertains to a standard
static lift application where the pump is posi-
tioned above the free levelof liquid to be pumped.
If installedinaflooded suctionapplicationwhere
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.
For furtherassistance, contact yourGorman-Rupp
distributor or the Gorman-Rupp Company.
Pump Dimensions
SeeFigure1fortheapproximatephysicaldimen-
sionsofthispump.
OUTLINE DRAWING
Figure 1. Pump Model U3B65-B

OM--03200 USERIES
PAGE B -- 2 INSTALLATION
PREINSTALLATION INSPECTION
The pump assemblywas inspected and testedbe-
fore shipment from the factory. Before installation,
inspect the pump for damage which may haveoc-
curred during shipment. Check as follows:
a. Inspectthepumpforcracks,dents,damaged
threads, and other obvious damage.
b. Check for and tighten loose attaching hard-
ware. Since gaskets tend to shrink after dry-
ing, check for loose hardware at mating sur-
faces.
c. Carefullyread all warnings and cautions con-
tained in this manual or affixed to the pump,
and perform all duties indicated. Note the di-
rection of rotation indicated on the pump.
Check that the pump shaft rotates clockwise
when facing the pump drive shaft.
Only operate this pump in the direction in-
dicated by the arrow on the pump body
and on the accompanying decal. Refer to
ROTATION in OPERATION,SectionC.
d. Check levels and lubricate as necessary. Re-
fer to LUBRICATION in the MAINTENANCE
AND REPAIR section of this manual and per-
form duties as instructed.
e.Ifthepumpandpowersourcehavebeen
stored for more than 12 months, some of the
components or lubricants may have ex-
ceeded their maximum shelf life. These must
be inspected or replaced to ensure maxi-
mum 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 deter-
minethe repairor updating policy. Donotputthe
pump into service until appropriate action has
been taken.
POSITIONING PUMP
Lifting
Use lifting equipment with a capacity of at least
2605 pounds (1181,6 kg). This pump weighs ap-
proximately521 pounds (236,3 kg), not including
the weight of accessories and base. Customer in-
stalled equipment such as suction and discharge
piping must be removed before attempting to lift.
Thepumpassemblycanbeseriously
damagedifthecablesor chains used tolift
andmovetheunitareimproperlywrapped
around the pump.
Mounting
Locatethepumpinanaccessibleplaceascloseas
practical tothe liquid being pumped. Level mount-
ing is essential for proper operation.
The pump may have to be supported or shimmed
to provide for level operation or to eliminate vibra-
tion.
The complete rotating assembly may be removed
through the cover plate opening, orfrom theoppo-
site side after disconnecting the power source to
provide necessary clearance.
Clearance
The extension pipe assembly provided with this
pump is integral to pump design and must be in
placewhenthepumpispositioned.Wheninstalled
onthepump,theextensionpipeassemblywillpro-
vide an automatic clearance of 18 inches (457
mm) in front of the back cover; this will permit re-
movaloftherotatingassemblythroughthebackof
the pump.
SUCTION AND DISCHARGE PIPING
Pump performance is adversely effected by in-
creased suction lift, discharge elevation, and fric-

OM--03200USERIES
PAGE B -- 3INSTALLATION
tion losses. See the performance curve and oper-
atingrangeshownonPageE-1tobesureyour
overall application allows pump to operate within
thesafeoperationrange.
Materials
Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatiblewiththeliquidbeingpumped.Ifhoseis
usedinsuction lines, it must be the rigid-wall, rein-
forced type to prevent collapseunder suction. Us-
ing piping couplings in suction lines is not recom-
mended.
Line Configuration
Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini-
mum use of elbows and fittings, which substan-
tiallyincreasefriction loss.Ifelbowsarenecessary,
use the long-radius type to minimize friction loss.
Connections to Pump
Before tightening a connecting flange, align it ex-
actly with the pump port. Never pulla pipe line into
place by tightening the flange bolts and/or cou-
plings.
Lines near the pump must be independently sup-
ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose-type
linesareused,theyshouldhaveadequatesupport
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 arenot
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 tothe pump may result in erratic
readings.
SUCTION LINES
Toavoidairpocketswhichcouldaffectpumpprim-
ing, the suction line must be as short and direct as
possible.Whenoperationinvolvesasuctionlift,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
Suctionlines 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 in-
stalled withthe flatpart ofthe reducers uppermost
to avoid creating air pockets. Valves are not nor-
mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock-
ets.
Strainers
If a strainer is furnished with the pump, be certain
touseit;anysphericalsolidswhichpassthrougha
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.
This pump is designed to handle up to 3/4 inch
(19,1 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 air-
tight seal. Follow the sealant manufacturer’s rec-

OM--03200 USERIES
PAGE B -- 4 INSTALLATION
ommendations 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 to1 1/2 times the diame-
ter 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 suc-
tion inlet because the inflow will carryair down into
the sump, and air entering the suction line will re-
duce pump efficiency.
If it is necessary to position inflow close to the suc-
tioninlet, installa bafflebetween 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,
theflowpathsmayinteract,reducingtheefficiency
of one or both pumps. To avoid this, position the
suction inlets so that they are separated by a dis-
tance 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 2 shows
recommended minimum submergence vs. veloc-
ity.
NOTE
The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at the
end of thesuction 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 2. Recommended Minimum Suction Line Submergence vs. Velocity