Installation
Installation Installation
Installation
General General
GeneralInformation Information
Information
TheTypicalInstallationshownisonlyaguidefor
selectingandinstallingsystemcomponents.Contact
yourGracodistributorforassistanceinplanninga
systemtosuityourneeds.AlwaysuseGenuine
GracoPartsandaccessories.Besureallaccessories
areadequatelysizedandpressureratedtomeetthe
system’srequirements.
Referencelettersinthetext,forexample(A),referto
thecalloutsinthegures.
Variationsincolorbetweentheplasticcomponents
ofthispumparenormal.Colorvariationdoesnot
affecttheperformanceofthepump.
Storage: Storage:
Storage:Pumpsthatarenotputintooperation
upondeliverymustbestoredappropriately.See
FlushingandStorage,page15.
Tighten Tighten
TightenBolts Bolts
Bolts
Beforemountingandusingthepumpforthe
rsttime,checkandretorqueallexternalbolts.
Removeallprotectiveboltcovers(37).Follow
TorqueInstructions,page24,totightenallbolts.
Replacetheboltcovers(37).Aftertherstdayof
operation,retorquethebolts.Retorquetheboltsifthe
pumphasbeenidleforanextendedtime,beenused
inthermalcyclingapplications,beendisassembled,
orifthereisalargedifferencebetweenenvironmental
temperaturesanduidtemperatures.
Tips Tips
Tipsto to
toReduce Reduce
ReduceCavitation Cavitation
Cavitation
CavitationinanAODDpumpistheformationand
collapseofbubblesinthepumpedliquid.Frequent
orexcessivecavitationcancauseseriousdamage,
includingpittingandearlywearofuidchambers,
balls,andseats.Itmayresultinreducedefciencyof
thepump.Cavitationdamageandreducedefciency
bothresultinincreasedoperatingcosts.
Cavitationdependsonthevaporpressureofthe
pumpedliquid,thesystemsuctionpressure,andthe
velocitypressure.Itcanbereducedbychangingany
ofthesefactors.
1.Reducevaporpressure:Decreasethe
temperatureofthepumpedliquid.
2.Increasesuctionpressure:
a.Lowertheinstalledpositionofthepump
relativetotheliquidlevelinthesupply.
b.Reducethefrictionlengthofthesuction
piping.Rememberthatttingsaddfriction
lengthtothepiping.Reducethenumberof
ttingstoreducethefrictionlength.
c.Increasethesizeofthesuctionpiping.
3.Reduceliquidvelocity:Slowthecyclicrateof
thepump.
Pumpedliquidviscosityisalsoveryimportantbut
normallyiscontrolledbyfactorsthatareprocess
dependentandcannotbechangedtoreduce
cavitation.Viscousliquidsaremoredifculttopump
andmorepronetocavitation.
Gracorecommendstakingalltheabovefactors
intoaccountinsystemdesign.Tomaintainpump
efciency,supplyonlyenoughairpressuretothe
pumptoachievetherequiredow.
Gracodistributorscansupplysitespecic
suggestionstoimprovepumpperformanceand
reduceoperatingcosts.
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