Mack MRU - Page 26

22OPERATION
1FillConnectiontoSecondFuelTank—Whenfueling,LNGwillenterthe
secondvesselthroughthisconnectingpipe.
2ManualVent—ThisvalveisclearlymarkedwithOPENandCLOSEdirectional
arrows.Itisnormallykeptclosed,butmaybeopenedtobleedthetankorincertain
fuelingsituationswhicharedescribedinthesection"LNGFueling."
Note:Thereisnormallynoneedtomanuallyventthetank.Thevesselisprotected
fromover-pressurizationbyseveralautomaticsafetyreliefvalves.
3FuelTankPressureGauge—Eachtankhasaseparatepressuregauge.The
normaloperatingpressureofthetanksisapproximately120psiorhigher.Normal
procedureistorefuelonadailybasisoreachtimethevehicleistakenintoactive
service.
4TankManufacturer’sManual—Locatedinsidethebottomhalfofthetankdoor.
Asthelabelindicates,thismanualshouldbereadentirelybeforeoperatingthetank.
5EvacuationPlug(DoNotRemove)—TheLNGfueltankisequippedwithan
outerjacketevacuationplugthatwillpopopenifthereisalossofvacuum.The
lossoftheevacuationplugindicatesaninnervesselleak.Theevacuationplugis
protectedfromtheenvironmentandtamperingbyaplasticcap.Donotremovethe
plasticcaporevacuationplug.
6FuelShut-OffValve—ThisvalveisclearlymarkedwithOPENandCLOSE
directionalarrows.Duringnormaloperation,thevalveshouldremainfullyopento
allowfueltoreachtheengine.Closethisvalvetoshutofffueltotheengine.
Note:Ifthereismorethanonetank,bothtankvalvesmustbeturnedofftoshut
offfueltotheengine.
7ExcessiveFlowValve—Restrictsexcessfuelowintheeventofafuelline
breakage.
8FuelT ankFillFitting—FillingtheLNGvehiclefueltanksisdonethrougha
singlehoseconnectedtothelltting.Instructionsonllingthefueltanksare
underthesection"LNGFueling."
9FuelGaugeSendingUnit—Receivessignalsfromthetankprobeandconverts
themintovaluescompatiblewiththefuelgauge.Thesendingunitissealedand
non-adjustable.
10FuelTankLevelProbe—Sensesthefuellevelinthetank.
Duringthedailywalkaroundinspection,ifyouseeanysignsofamethaneleaksas
previouslymentionedintheSAFETYsectionofthishandbook,openthetankdoor.If
theEvacuationPlughaspoppedout,thetankmustbeservicedbeforeoperating.