API机械密封冲洗方案.ppt

1 APIPipingPlansAPI冲洗方案 November2004 JCTianjinTrainingModule4 3 SealEnvironment密封环境 APIPipingPlansAPI冲洗方案 Integral internal recirculationfrompumpdischargetoseal Advantage NoexternalpipingLimitations Changingflowraterequireddismantlingofpump Forcleanpumpagesonly APIPipingPlansAPI冲洗方案 PointstoNoteforAPIPlan02 Theinjectiontappingisusedforventingpriortostart up APIplan02isoftenusedtogetherwithplan62 especiallyonhightemperaturebellowsseals APIPipingPlansAPI冲洗方案 Noflushingtothemechanicalseal dead ended PointstoNoteforAPIPlan11 Useanorificetorestricttheflowrateifthedischargepressureis3barhigherthansealchamberpressure Useoncleanandlowabrasivesduties APIPipingPlansAPI冲洗方案 SealFlushingBy PassfromDischarge单密封通过出口进行冲洗 Recirculationfromsealchamberthroughaflowcontrolorificeandbacktopumpsuction PointstoNoteforAPIPlan13 Useanorificetorestricttheflowrateifthesealchamberpressureis3barhigherthansuctionpressure handleabrasivesdutybetterthanAPIplan11 highersealchamberpressuretosuppressvaporisation APIPipingPlansAPI冲洗方案 PointstoNoteforAPIPlan14 Flowbacktosuctionsidewillevacuatevapoursthatmaycollectinsealchamber Recommendedforlighthydrocarbonservice APIPipingPlansAPI冲洗方案 RecirculationfrompumpdischargethroughaflowcontrolorificeandcoolertosealOpenLoopCoolingCircuit CoolingWaterOutlet CoolingWaterInlet APIPipingPlansAPI冲洗方案 RecirculationfromapumpingringinthesealchamberthroughcoolerandbacktosealClosedLoopCoolingCircuit Throatbushing Suction Discharge 18 24 Ventathighestpointofthepiping CoolingWaterOutlet CoolingWaterInlet mechanicalsealwithpumpingring Heatexchanger APIPipingPlansAPI冲洗方案 PointstonoteforAPIPlan23 Thermosyphondesign heatexchanger18to24 abovepumpcentreline Preventoverheatinginstandbyandstart up Installclosefittingneckbushingatthebottomofsealchambertoisolatetheheatfromtheimpellerend Usedonhightemperatureapplicationstominimiseheatloadonthecoolerbycoolingonlysmallamountofliquidthatisrecirculated ForhightemperatureboilerfeedpumpapplicationsOtherapplications hightemperatureliquidclosetobubblepoint APIPipingPlansAPI冲洗方案 Recirculationfrompumpdischargethroughacycloneseparatordeliveringcleanfluidtothesealandfluidwithsolidsbacktopumpsuctionline APIPipingPlansAPI冲洗方案 PointstoNoteforAPIPlan32 Choseapropersourceofsealflushtoeliminatethepotentialforvaporisationoftheinjectedfluidandtoavoidcontaminationofthefluidbeingpumpedwiththeinjectedflush Installalabyrinthbushingatthebottomofthestuffingboxtocontroltheflushingandpressureifnecessary APIPipingPlansAPI冲洗方案 SingleSealFlushingfromExternalSource单密封通过外部来源进行冲洗 ThroatBushing Recirculationfrompumpdischargethroughacycloneseparatordeliveringcleanfluidthroughacoolerandthentosealandfluidwithsolidsbacktopumpsuctionline CoolingWaterOutlet CoolingWaterInlet APIPipingPlansAPI冲洗方案 Needlevalve Externalreservoirprovidingadead endedblanketoffluidtothequenchconnectionofthegland PointstoNoteforAPIPlan51 Deadendedblanketonatmosphericsideofsealtopreventfreezingofmoisture Sealfacewillnotsticktogetherwhenthepumpstarted Typicalapplication Pumpoperatingbelow0 C API6108thEditionhaseliminatedthispipingplan APIPipingPlansAPI冲洗方案 PipingSystems APIPipingPlansAPI冲洗方案 Afluidusedasalubricantorbufferbetweendualmechanicalseals Thebufferfluidisalwaysatapressurelowerthanthepumpprocesspressurebeingsealed Afluidwhichisintroducedbetweendualmechanicalsealstocompletelyisolatethepumpprocessliquidfromtheenvironment Pressureofthebarrierfluidisalwayshigherthanthepumpprocesspressurebeingsealed Thepurposeoffluidcirculationistoremoveheatfrommechanicalseal APIPipingPlansAPI冲洗方案 Onapplicationsbelowambienttemperature circulationofbarrierfluidmaynotbedesirable Theatmospherewillheatthereservoirandconsequentlyaddheattothesealarea Fluidcirculationbytemperaturedifferencebetweenthesealandreservoir Highertemperatureliquidatsealhaslowerdensityrisestothereservoir Lowertemperatureliquidatreservoirhashigherdensityfallstothesealtoprovidecooling ExternalForceCirculation Thermosyphon PumpingRing DeadEnded APIPipingPlansAPI冲洗方案 PointstoNoteforAPIPlan52 TypicallyusedwithanArrangement2unpressuriseddualseal Duringnormaloperation circulationismaintainedbyaninternalpumpingring Thereservoirisusuallycontinuouslyventedtoavapourrecoverysystemandismaintainedatapressurelessthanthepressureinthesealchamber PressureGauge LevelGauge Fillvalve Orifice Drain LevelSwitch H LevelSwitch L PressureSwitch NormallyOpen Ventvalve Externalreservoirprovidingbufferfluidfortheoutersealofanunpressuriseddualsealarrangement APIPipingPlansAPI冲洗方案 PressureGauge LevelGauge LevelSwitch L VentValve NormallyClose Orifice PressureSwitch ExternalPressureSource One wayBlockValve NormallyOpen PointstoNoteforAPIPlan53 TypicallyusedwithanArrangement3pressuriseddualseal Duringnormaloperation circulationismaintainedbyaninternalpumpingring Thereservoirpressureisgreaterthantheprocesspressurebeingsealed Externalreservoirprovidingpressurisedbarrierfluidfortheoutersealofanpressuriseddualsealarrangement Drain APIPipingPlansAPI冲洗方案 PointstoNoteforAPIPlan54 TypicallyusedwithanArrangement3pressuriseddualseal Duringnormaloperation circulationismaintainedbyanexternalpumporpressuresystem Thecirculatingbarrierfluidpressureisgreaterthantheprocesspressurebeingsealed Externalbarrierfluidsystemprovidingpressurisedbarrierfluidfortheoutersealofanpressuriseddualsealarrangement APIPipingPlansAPI冲洗方案 Safetouse handle storeStableliquidatambienttemperaturesNotaVOC VHAPorotherregulatedcompoundNonflammableNonfoamingwhenpressurisedCleanandgoodlubricityCompatiblewithprocessfluidCompatiblewithsealmaterialsGoodheattransferpropertiesGoodflowqualitiesatverylowtemperaturesLowsolubilityofgasLocalavailabilityLowcost VOC VolatileOrganicCompoundVHAP VolatileHazardousAirPolutants SelectionofBuffer BarrierFluid APIPipingPlansAPI冲洗方案 Tappedconnectionsforthepurchaser suse PointtoNoteforAPIPlan61 Typicallythisplanisusedwhenthepurchaseristoprovidefluid suchassteam gas orwater toanauxiliarysealingdevice APIPipingPlansAPI冲洗方案 PointstoNoteforAPIPlan62 Thequenchmayberequiredtopreventsolidsfromaccumulatingontheatmosphericsideoftheseal Typicallyusedwithaclose clearancethrottlebushing APIPipingPlansAPI冲洗方案 SingleSealQuenchfromExternalSource单密封通过外部急冷 API6822ndEditionAPI682第二版NewPipingPlans新的冲洗方案 Plan14 Plan11 13 Plan53 s Arrangement3 ContactingWet CW Seals53a traditionalconfiguration53b bladderaccumulator53c pistonpot accumulatorContainmentSealPlan72 Arrangement2w ContainmentSeal CS Plan75 Arrangement2w ContainmentSeal CS Plan76 Arrangement2w ContainmentSeal CS GasBarrierSealsPlan74 Arrangement3 Non Contacting NC Seals Plan53a A 4 12 Arrangement3 ContactingWet CW SealsDualPressurised Double SealsUtilisesdirectnitrogenblanketforpressureduetonitrogenentrainmentinthebarrierliquidAPI682limitsthemaximumnitrogenpressureto10barg JCrecommendationismaximumnitrogenpressure21barg aslongasthebarrierfluidtemperatureislessthan120 C API6822ndEditionAPI682第二版NewPipingPlans新的冲洗方案 Plan53b A 4 12 Arrangement3 ContactingWet CW SealsDualPressurised Double SealsUtilizesbladderaccumulatorforpressureBladdereliminatesnitrogencontactwithbarrierliquidAllowsforhigherpressureapplications ConfigurationIncludes AccumulatorPressureIndicatorPressureSwitchHeatExchanger API6822ndEditionAPI682第二版NewPipingPlans新的冲洗方案 Plan53c A 4 12 Arrangement3 ContactingWet CW SealsDualPressurised Double SealsUtilizespistonpotforpressure API6822ndEditionAPI682第二版NewPipingPlans新的冲洗方案 Plan53c A 4 12 AllowsforhigherpressureapplicationsConfigurationincludes PistonpotPressureindicatorPressureswitchHeatexchangerLevelswitch PistonpoteliminatesnitrogencontactwithbarrierliquidPistonprovidesconstantpressureratiotoseals 1 1 1 Spring API6822ndEditionAPI682第二版NewPipingPlans新的冲洗方案 BarrierFluidTemperature 7 3 4 1 1 隔离流体温度 Liquidbarriersystemsshallbedesignedsuchthatthatmaximumtemperaturedifferentialbetweenthebarrierfluidinletandoutletimmediatelyadjacenttothesealchamberis 8degreeCforglycol waterordieselbarrierfluids and16degreeCformineraloilbarrierfluid Plan11withPlan53 Arrangement3mayusePlan11 53ImprovedheattransferReversepressurecapability BacktoBack sealsusesPlan53 API6822ndEditionAPI682第二版NewPipingPlans新的冲洗方案 Plan72 A 4 16 Arrangement2 w ContainmentSeal CS DualUn Pressurised Tandem SealsDry runningsecondarycontainmentsealLowpressurenitrogensweep purge SweepsprimaryleakagetocollectionsystemDilutesprimaryleakagetoloweremissionlevelsUsedinconjunctionwithPlan75or76 CSV containmentsealventCSD containmentsealDrainGBI gasbufferinletFIL coalescingfilt