Gorman-Rupp Pumps VGH1 1-2C31-B User Manual

Page 1
PUBLICATION NUMBER OM--05146 August 7, 2000
VGH SERIES PUMPS
THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
eCopyright by the Go rman-Rupp Company
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OM--05146 VGH SERIES
INTRODUCTION
Thank You for purchasing a Gorman-Rupp Self-
Priming 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 Operation Manual 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 curve(s), a pump model cross-section drawing, and parts list for your pump.
The Maintenance and Repair Manual 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-
contains essential information
provides performance
Installation/
provides
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 ac- cording 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 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 PAGE B --- 1.....................................................
PREINSTALLATION INSPECTION PAGE B --- 1...............................................
P O S I T I O N I N G P U M P PA G E B --- 1..........................................................
SUCTION AND DISCHARGE PIPING PAGE B --- 2............................................
AUTOMATIC AIR RELEASE VALVE PAGE B --- 5..............................................
ALIGNMENT PA G E B --- 7.................................................................
ELECTRICAL CONNECTIONS PAGE B --- 9..................................................
OPERATION -- SECTION C
PRIMING PA G E C --- 1....................................................................
STARTING PA G E C --- 1...................................................................
OPERATION PA G E C --- 2.................................................................
STOPPING PA G E C --- 3...................................................................
BEARING TEMPERATURE CHECK PAGE C --- 4.............................................
LUBRICATION PA G E C --- 4................................................................
PAGE I -- 1
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OM--05146VGH SERIES
RECORDING MODEL AND
WARRANTY INFORMATION
SERIAL NUMBERS
The warranty provided with your pump is part of
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:
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.
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.
Hazards or unsafe practices whichCOULD result in minor personal injury or productor property damage. These instructions de­scribe the requirements and the p ossible damage which could 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.
NOTE
Instructions to aid in installation, operation, and maintenance or which clarify a procedure.
PAGE I -- 2
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VGH SERIES
OM--05146
SAFETY - SECTION A
This information applies to the VGH Se­ries Basic Pumps. These pumps are ba ­sic, pedestal -mounted model and may be 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, thismanual cannot possibly antici ­pate 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 integ rity 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.
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 liqui d s 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 compatibilitybetween 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 re ­moved from the pump before lifting.
Before attempting to open or service the pump:
1. Familiarize yourself with this man­ual.
2. Disconnect or lock out the power source and take necessary pre­cautions to en sure that the pump will remain inoperative.
3. Allow the pump to completely cool if overheated.
After the pump has been positioned, make c ertain that the pump and all pip­ing or hose connections are tight, prop ­erly supported and secure before oper­ation.
Do not operate the pump against a closed discharge valve for long periods oftime.Ifoperatedagainstacloseddis­charge valve, pump components will deteriorate, and the liquid could come
PAGE A -- 1SAFETY
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VGH SERIESOM--05146
to a boil, build pressure, and cause the pump casing to rupture or e xplode.
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.
Never run this pump backwards. Be cer­tain that rotation is correct before fully engaging the pump.
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 c onflict between the instruc­tions in the manual accompanying the unit and the National Elec tric 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 p ump i s used to pump m aterials which c ould cause serious illness or in ­jury through di rect 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 parts can catch clothing, fingers, or
If the pump is electric motor driven, the electrical power used t o operate the pump is high enough to cause injury or death. Obtain the services of a qualified electrician to trouble shoot, test and/or service the electrical components of this pu mp.
Pumps and related equipment must be in­stalled and operated according to all na­tional, local and industry standards.
PAGE A -- 2
SAFETY
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VGH SERIES OM --05146
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 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).
For further assistance, contact your Gorman-Rupp distributor or the Gorman-Rupp Company.
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.
d. Check levels and lubricate as necessary. Re-
fer 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 s ource 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.
Pump Dimensions
See the individual pump specification data sheet for the approximate physical dimensions of the pump.
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 hard-
ware. Since gaskets tend to shrink after dry­ing, check for loose hardware at mating sur­faces.
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, or optionalequipment. Cus­tomer installed equipment such as suction and dis­charge pipingmust be removed before attempting to lift.
Thepumpassemblycanbeseriously damaged if the chains or cables used to lift and move the unit are improperly wrapped around the pump.
See the individual pump specification data sheet for the approximate weight of the pump.
PAGE B -- 1INSTALLATION
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OM--05146 VGH SERIES
Mounting
Locate th e pump in an accessible place as close as practical to the 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 vibra­tion.
SUCTION AND DISCHARGE PIPING
Pump performance is adversely effected by in­creased suction lift, discharge elevation, and fric­tion losses. See t he performance curve in the Parts List manual to be sure your overall application al­lows the pump to operate within the safe operation range.
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 a nd discharge lines as straight as possible to minimize friction losses. Make mini­mum use of elbows and fittings, w hich 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.
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 a nd tap the suction a nd 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
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.
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.
PAGE B -- 2 INSTALLATION
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
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VGH SERIES OM --05146
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.
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. veloc-
ity.
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-1. Recommended Minimum Suction Line Submergence vs. Velocity
PAGE B -- 3INSTALLATION
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OM--05146 VGH SERIES
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.
Val ves
If a throttling valve is desired in the discharge line, useavalveaslargeasthelargestpipetominimize friction losses. Never install a throttling valve in a suction line.
A check valve in t he discharge line is normally rec­ommended, but it is not necessary in low dis­charge head applications.
With high discharge heads, it is recommendedthat 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.
LUBRICATION
FILL ONLY
THROUGH
CONSTANT
LEVEL OILER
DO NOT FILL
THROUGH
VENT PLUG
Figure B --2. Lubricating Bearing Cavity
Do not fill the bearing cavity through the vent plug
in the top of the housing. This will result in over-fill­ing, and can cause leakage, excessive heat build up and/or premature bearing failure.
Check the oil level regularly through the constant leveloilerandaddoilasrequired.
Seal Assembly
The seal assembly is lubricated by the medium be­ing pumped and no additional lubrication is re­quired.
ALIGNMENT
The alignment of the pump and its power source is critical for trouble-free mechanical operation. In either a flexible coupling or V-belt driven system, the driver and pump must be mounted so that their shafts are aligned with and parallel to each other. It is imperative that alignment be checked after the pump and piping are installed, and before opera­tion.
NOTE
Check Rotation, Section C, before final alignment of the pump.
Bearings
The bearing housing was not lubricated when shipped f rom the factory. To lubricate the bearing
cavity, fill the constant level oiler as shown in Figure B--- 2, then close the oiler and allow t he oil to drain into the bearing cavity. Repeat this procedure until oil no longer drains from the constant level oiler.
PAGE B -- 4 INSTALLATION
When mounted at the Gorman-Rupp factory, driver andpumparealignedbeforeshipment.Misalign­ment will occur in transit and handling. Pumps must be checked and realigned before operation. Before checking alignment, tighten the foundation bolts. The pump casing feet and/or pedestal feet, and the driver mounting bolts should also be tightly secured.
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VGH SERIES OM --05146
ARA
A
V
When checking alignment, disconnect the power source to en sure 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_ de ­grees. The coupling is in alignment when the hub ends are the same distance apart at all points (see Figure B-3).
Figure B-4. Aligning Non-Spider Type Couplings
Check paralleladjustment 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 B-5). In drive systems using two or more belts, make certain that the belts are a matched set; unmatched sets will cause accelerated belt wear.
Figure B -3. Aligning Spider-Type Couplings
MISALIGNED:
SHAFTS
NOT P
LLEL
MISALIGNED:
SHAFTS
NOT IN LINE
ALIGNED: SHAF TS
PARALLEL AND
SHE
ES IN LINE
Figure B-5. Alignment of V-Belt Driven Pumps
Align non-spider type couplings by using a feeler gauge or taper gauge between the couplinghalves every 90_. The coupling is in alignment when the hubs are the same distance apart at all points (see Figure B-4).
Tighten the belts in accordance with the belt manu­facturer’s instructions. If t he belts are too loose, they will slip; if the belts are too tight, there w ill be excessive power loss and possible bearing failure.
PAGE B -- 5INSTALLATION
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OM--05146 VGH SERIES
Select pulleys that will match the proper speed ra­tio; overspeeding the pump may damage both pump and power source.
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 con -
Do not operate the pump without the
nections. guard in place over the rotating parts. exposed rotating 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 ELECTRICAL CONNECTIONS
proof motor in an explosive atmo-
sphere. An explosion, which may cause
Ifthepumpisdrivenbyanelectricmotor, 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.
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 c onflict between the instruc-
tions in the manual accompanying the
unit and the National Elec tric Code or
If rotation is incorrect on a three -phase motor, have a qualified electrician interchange any two of the three phase w ires to change direction. If rotation is incorrect on a single-phase motor, consult the lit­erature supplied with the motor for specific instruc­tions.
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 -- 6 INSTALLATION
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VGH SERIES
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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 liqui d s 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 shownonthecurveinPartsListsmanual.
Refer to the pump Specification Data Sheet or the accompanying Parts List Manual for the specific performance for your pump.
priming device, close the discharge throttling
valve. (Installation of a spring-loaded check valve
is also recommended to facilitate priming.) Once
the pump is fully primed, close the valve between
the priming device and pump to preserve the
prime. Start the pump and open the discharge
valve slowly to fill the discharge line. When installed
in a flooded suction application, simply open the
system valves and permit the incoming liquid to
evacuate the air. After the pump and piping system
have completely filled, evacuate any remaining air
pockets in the pump or suction line.
Never operate the pump unless there is liq-
uid in the pump casing. The pump will not
prime when dry. Extended operation of a
dry pump will destroy the seal assembly.
PRIMING
After filling the pump casing, reinstall
and tighten the fill plug. Do not attempt
Install the pump and piping as described in IN­STALLATION. Make sure that the piping connec-
tions are tight, and that the pump is securely mounted. Check that the pump is properly lubri­cated (see LUBRICATION in the MAINTENANCE AND REPAIR manual).
This is not a self-priming pump, so an external priming device must be used if the pump is in­stalled on a suction lift. A foot valve may be in­stalled at the end of the suction pipe to maintain the prime; however, this may adversely affect pump performance due to friction loss. Many standard centrifugal models are equipped with a hand-oper­ated vacuum pump, exhaust primer, or ejector for this purpose. If a priming device was not furnished with the pump, it may be ordered from the factory as an option. Before attempting to operate the
OPERATION PAGE C -- 1
to operate the pump unless all connect-
ing piping is securely installed. Other-
wise, liquid in the pump forced out
under pressure could c ause injury to
personnel.
Hand Primers
Hand-operated primers are usually mounted on
the pump a nd, w hen operated, draw air out of the
suction line and pump casing. To prime a pump
with a hand vacuum pump, open t he cock on the
pump priming line. Operate the hand pump until
liquid flows out of the check valve on the bottom of
the primer pump. Once the pump is primed, close
the valve located between the primer and the
pump so that the prime will not be lost.
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Vacuum Pumps
VGH SERIESOM --05146
HANDLE
DRAIN
COCK
Figure C-1. Hand Primer Assembly
Exhaust Primers
Engine driven pumps normally take advantage of the engine exhaust gases by usingthem to operate an exhaust primer. The exhaust is directed through a venturi which creates a vacuum in the pump cas­ing in order to fill the suction line and pump casing with liquid. To prime a pump using an exhaust primer, open the gas cock in the priming line and engage the exhaust primer until liquid is thrown out of the ejector nozzle.
Air can be exhausted to prime a pump by using a
vacuum pump. Either a wet t ype or a dry type vac-
uum pump may be used; however, a wet type is
preferred since it will not be damaged if liquid en-
ters it. If a dry vacuum pump is used, provisions
must be made to keep liquid from entering it.
STARTING
Starting procedures will vary slightly depending on
the pump application, type of priming device, and
type of drive. Consult the operations manual fur -
nished with the power source.
Rotation
The correct direction of pump rotation is indicated
by an arrow on the pump body or accompanying
decals. If t he pump is operated in the wrong direc-
tion, the impeller could become loosened from the
shaft and seriously damage the pump.
HANDLE
GAS
COCK
Figure C-2. Exhaust Primer Assembly
Air can be exhausted to prime a pump by using a vacuum pump. Either a wet t ype or a dry type vac­uum pump may be used; however, a wet type is preferred since it will not be damaged if liquid en­ters it. If a dry vacuum pump is used, provisions must be made to keep liquid from entering it.
Auxiliary Ejectors
Ejectors function much like exhaust primers. They maybeoperatedbysteam,compressedair,water or exhaust gases. To prime a pump using an ejec­tor, open the gas cock in the priming line and oper­ate the ejector until liquid is thrown out the ejector nozzle.
The pump must operate in the direction in-
dicated by the arrow on the pump, or ac-
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 be -
fore 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 w ires to change direction. If rotation is
incorrect on a single-phase motor, consult the lit-
erature supplied with the motor for specific instruc-
tions.
OPERATION
Pump speed and operatingpoints must be
within the continuous performance range
OPERATIONPAGE C -- 2
Page 14
VGH SERIES
OM--05146
shownonthepumpcurve.(SeetheParts List Manual accompanying the pump.)
Leakage
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.
Liquid Temperature And Overheating
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.
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.
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 Gorman-
Rupp 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 in-
stalled, 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 neces-
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve.
Pump Vacuum Check
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. 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 li quid.
If overheating does occur, stop the pump immedi­ately and allow it to cool before servicing it. Ap- proach any o verheated pump cautiously.
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, 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.
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
OPERATION PAGE C -- 3
Check t he pump for unusual noises or excessive vibration while it is operating. If noise or vibration is excessive, stop the pump and refer to Troubl e - shooting in the Maintenance And Repair Manual for possible causes.
Page 15
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
VGH SERIESOM --05146
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.
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.
If the application involves a high discharge head, gradually close the discharge throttling valve before stopping the pump.
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 t he drain port, and agitate the liquid during the draining process. Clean out any remaining solids by flushing with a hose.
A sudden increase in bearing temperature is a warning that the bearings are at the point of failing to operate properly. Mak e 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.
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 bearing cavity before initial startup, after the first two weeks of operation, and every month thereafter.
Before installing or removing a lubrication plug, a l­ways 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 liq-
OPERATIONPAGE C -- 4
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VGH SERIES
OM--05146
uid 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.
Bearings
Bearing housings are fully lubricated when shipped from the factory. Check the constant level oiler regularly and keep it full of oil. When lubrica­tion is required, flip the transparent oiler cup open and fill it with SAE No. 30 non-detergent
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 con-
oil.
tinuously or installed in an environment with rapid temperature change.
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 oil.
Power Source
Consult the literature supplied with the power source, or contact your local power source repre­sentative.
OPERATION PAGE C -- 5
Page 17
For U.S. and International Warranty Information,
Please Visit www.grpumps.com/warranty
or call:
U.S.: 419−755−1280
International: +1−419−755−1352
For Canadian Warranty Information,
Please Visit www.grcanada.com/warranty
or call:
519−631−2870
THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA
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