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PUBLICATIONNUMBEROM--04760
December2, 1998
Rev. A 11-20-03
SELF-PRIMING
CENTRIFUGAL PUMPS
THEGORMAN-RUPPCOMPANYDMANSFIELD,OHIO
GORMAN-RUPPOFCANADALIMITEDDST.THOMAS,ONTARIO,CANADA Printed in U.S.A.
eCopyright by the Gorman-Rupp Company
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS INTRODUCTION Thank You for purchasing a Gorman-Rupp Self- structions and precautions for every aspect of Priming Centrifugal Pump. Read this manual each specific application. Therefore, it is the re- carefully to learn how to safelyinstall and operate sponsibility of the owner/installer of the pump to yourpump.Failuretodosocouldresultinpersonal ensure that applications not addressed in this injury or damage to the pump. manualareperformedonly afterestablis
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 RECORDINGMODELAND WARRANTYINFORMATION SERIALNUMBERS The warranty provided with your pump is part of Gorman-Rupp’s support program for customers Pleaserecordthepumpmodelandserialnumber who operate and maintain theirequipment asde- inthespacesprovidedbelow. YourGorman-Rupp scribedinthisandtheother accompanyinglitera- distributorneedsthisinformationwhenyourequire ture. Please note that should the equipment be parts or service. abusedormodifiedtochangeitsperfo
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 SAFETY -SECTIONA This information applies to G-R Self- 4. Check the temperature before Priming Centrifugal pumps. These opening any covers, plates, or pumpsareavailableasbasic,pedestal- plugs. mounted models or as close-coupled 5. Close the suction and discharge modelsdrivenbyeitheranelectricmo- valves. tor, gasoline or diesel engine. Refer to 6. Vent the pump slowly and cau- tiously. the manual accompanying the power sourcebeforeattemptingtobeginoper- 7.
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OM--04760 SELF-PRIMING CENTRIFUALPUMPS toaboil,build pressure,and causethe parts can catch clothing, fingers, or pumpcasing torupture orexplode. tools, causing severe injury to person- nel. Do not remove plates, covers, gauges, pipe plugs, or fittings from an over- If the pump is powered by an electric heatedpump.Vaporpressurewithinthe motor, do not operate a non-explosion pump can cause parts being disen- proof motor in an explosive atmo- gagedtobeejectedwithgreatforce.Al- sphere.Anexplosion,wh
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 uous operating speed for the pump is shownontheperformancecurve(see the PartsListManual). Fuel used by internal combustion en- gines presents an extreme explosion and fire hazard. Make certain that all fuel lines are securely connected and Ifthepumpispoweredbyanengine,the free of leaks. Never refuel a hot orrun- engine exhaust from this product con- ning engine. Avoid overfilling the fuel tains chemicals known to the State of tank.Alwaysusethecorrecttypeof
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 INSTALLATION --- SECTIONB Reviewall SAFETYinformationinSectionA. d. Check levelsandlubricateas necessary. Re- fer to LUBRICATION in the MAINTENANCE Sincepumpinstallationsareseldomidentical,this ANDREPAIRsectionofthismanualandany sectionoffersonlygeneralrecommendationsand other literature accompanying the unit and practices required to inspect, position, and ar- perform duties as instructed. range the pump and piping. e. If the pump and power source have be
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 slopes down to the pump at any point along the Suction Lines In Sumps suction run, air pockets will be created. If a single suction line is installed in a sump, it Fittings should be positioned away from the wall of the sumpatadistanceequalto1-1/2timesthediame- Suctionlinesshouldbethesamesizeasthepump ter of the suction line. inlet. If reducers are used in suction lines, they should be the eccentric type, and should be in- If there is a liquid flow from an
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 minimize the chance of plugging. theairreleasepiping,itmustbeafull-openingball type valve to prevent plugging by solids. Inlowdischargeheadapplications(lessthan30 feet or 9 meters), it is recommended that the by- passlineberunbacktothewetwell,andlocated6 inches below the water levelor cut-offpoint ofthe Ifamanualshut-offvalve isinstalledin low level pump. In someinstallations, thisbypass abypassline,itmustnotbe leftclosed line may be terminated with a six-
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS liters per minute) will occur when the valveisfullyclosed.Besurethebypass line is directed back to the wet well or tanktopreventhazardousspills. Whenthepumpshutsdown,thespringreturnsthe diaphragm to its original position. Any solids that mayhaveaccumulatedinthediaphragmchamber settletothebottomandareflushedoutduringthe next priming cycle. Figure2.ValveinOpenPosition NOTE The valve will remain open if the pump does not Duringtheprimingcycle,airfromthepumpca
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS When checking alignment, disconnect the power source to ensure that the pumpwillremaininoperative. Adjusting the alignment in one direction Figure 6. Aligning Non-SpiderType Couplings may alter the alignment in another direc- tion. check each procedure after altering Checkparalleladjustmentbylayingastraightedge alignment. acrossbothcouplingrimsatthetop, bottom, and side. When the straightedge rests evenly on both halvesofthecoupling,thecouplingisinhorizont
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SELF-PRIMING CENTRIFUGALPUMPS OM--04760 Selectpulleysthatwillmatchtheproperspeedra- tio; overspeeding the pump may damage both pump and power source. Theelectricalpowerusedtooperatethe pumpishighenoughtocause injuryor death.Obtaintheservicesofaqualified electrician to make all electrical con- nections. Do not operate the pump without the guard in place over the rotating parts. exposedrotatingpartscancatchcloth- ing,fingers,ortools,causingseverein- jury topersonnel. If the pump is powered by an e
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS OPERATION --- SECTIONC Reviewall SAFETYinformationinSectionA. Add liquid to the pump casing when: 1. The pump is being put into service for the Follow the instructions on all tags, labels and de- first time. cals attached to the pump. 2. Thepumphasnotbeenusedforaconsider- able length of time. 3. The liquid in the pump casing has evapo- rated. Once the pump casing has been filled, the pump will prime and reprime as necessary. Donotattemptto pump any liquids
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS sure which could damage pipe ends, gaskets, companying decals. Reverse rotation sprinklerheads, andanyotherfixturesconnected could loosen the impeller and seriously to the line. When the discharge line is completely damage the pump. filled,adjustthethrottlingvalvetotherequiredflow If the pump is driven by an electric motor, consult rate. theoperatingmanualfurnishedwiththemotorbe- fore attempting to start the motor. Ifrotationisincorrectonathree-phasemotor,
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS checkforairleaksintheseal,gasket,ordischarge terthepumpcools,draintheliquidfrom valve. thepumpbyremovingthecasingdrain plug. Use caution when removing the Openthesuctionline,andreadthevacuumgauge plugtopreventinjurytopersonnelfrom with the pump primed and at operation speed. hotliquid. Shutoffthepump.Thevacuumgaugereadingwill immediately drop proportionate to static suction Ifoverheating doesoccur, stopthe pumpimmedi- lift,andshouldthenstabilize.Ifthevacuu
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS After stopping the pump, lock out or disconnect LUBRICATION the power source to ensure that the pump will re- main inoperative. Cold WeatherPreservation Do not remove plates, covers, gauges, pipe plugs or fittings from an over- In below freezing conditions, drain the pump to heatedpump.Vaporpressurewithinthe preventdamagefromfreezing.Also,cleanoutany pump can cause parts being disen- solids by flushing with a hose. Operate the pump gagedtobeejectedwithgrea
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OM--04760 SELF-PRIMING CENTRIFUGALPUMPS stem;thiswillreleasethespringtoapplygreaseto Grease Lubricated Bearings the seal. Bearing housings are fully lubricated when shippedfromthefactory.Undernormalconditions, add No. 0 lithium base grease from a grease gun Oil Lubricated Bearings through the grease fitting after each 250 hours of operation or once each month, whichever comes first. Do not over-lubricate. Over-lubrication can Bearing housings are fully lubricated when cause the bearings to over-
