Installation
Installation Installation
Installation
Installationofthisequipmentinvolvespotentially
hazardousprocedures.Onlytrainedandqualied
personnelwhohavereadandwhounderstand
theinformationinthismanualshouldinstallthis
equipment.
•Allelectricalwiringmustbedonebyaqualied
electricianandcomplywithalllocalcodesand
regulations
General General
GeneralInformation Information
Information
TheTypicalInstallationshownisonlyaguidefor
selectingandinstallingsystemcomponents.Contact
yourGracodistributorforassistanceinplanninga
systemtosuityourneeds.AlwaysuseGenuine
GracoPartsandaccessories.Besureallaccessories
areadequatelysizedandpressureratedtomeetthe
system’srequirements.
Referencelettersinthetext,forexample(A),referto
thecalloutsinthegures.
Tighten Tighten
TightenClamps Clamps
ClampsBefore Before
BeforeFirst First
FirstUse Use
Use
Afteryouunpackthepump,andbeforeyouuseit
forthersttime,checkallclampsandtightenas
necessary.
Tips Tips
Tipsto to
toReduce Reduce
ReduceCavitation Cavitation
Cavitation
Cavitationinadoublediaphragmpumpisthe
formationandcollapseofbubblesinthepumped
liquid.Frequentorexcessivecavitationcancause
seriousdamage,includingpittingandearlywearof
uidchambers,balls,andseats.Itmayresultin
reducedefciencyofthepump.Cavitationdamage
andreducedefciencybothresultinincreased
operatingcosts.
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.
NOTE: NOTE:
NOTE:Iftheuidinletpressuretothepumpis
morethan25%oftheoutletworkingpressure,
theballcheckvalveswillnotclosefastenough,
resultingininefcientpumpoperation.Excessive
inletuidpressurealsowillshortendiaphragm
life.Approximately3-5psi(0.02-0.03MPA,
0.21-0.34bar)shouldbeadequateformost
materials.
3.Reduceliquidvelocity:Slowthecyclicrateof
thepump.
Pumpedliquidviscosityisalsoveryimportantbut
normallyiscontrolledbyfactorsthatareprocess
dependentandcannotbechangedtoreduce
cavitation.Viscousliquidsaremoredifculttopump
andmorepronetocavitation.
Gracorecommendstakingalltheabovefactors
intoaccountinsystemdesign.Tomaintainpump
efciency,operatethepumpatthelowestspeedand
pressuresettingneededtoachievetherequiredow.
Gracodistributorscansupplysitespecic
suggestionstoimprovepumpperformanceand
reduceoperatingcosts.
3A5132K9
