API机械密封冲洗方案.ppt

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1、APIPipingPlansAPI冲洗方案November2004JCTianjinTrainingModule4.3SealEnvironment密封环境1APIPipingPlansAPI冲洗方案Integral(internal)recirculationfrompumpdischargetosealAdvantage-NoexternalpipingLimitations-Changingflowraterequireddismantlingofpump-ForcleanpumpagesonlyAPIPipingPlans

2、API冲洗方案PointstoNoteforAPIPlan02:-Theinjectiontappingisusedforventingpriortostart–up.-APIplan02isoftenusedtogetherwithplan62,especiallyonhightemperaturebellowsseals.APIPipingPlansAPI冲洗方案Noflushingtothemechanicalseal(‘dead-ended’)PointstoNoteforAPIPlan11:-Useanorificeto

3、restricttheflowrateifthedischargepressureis3barhigherthansealchamberpressure.-UseoncleanandlowabrasivesdutiesAPIPipingPlansAPI冲洗方案SealFlushingBy-PassfromDischarge单密封通过出口进行冲洗RecirculationfromsealchamberthroughaflowcontrolorificeandbacktopumpsuctionPointstoNoteforAPIPla

4、n13:-Useanorificetorestricttheflowrateifthesealchamberpressureis3barhigherthansuctionpressure.-handleabrasivesdutybetterthanAPIplan11-highersealchamberpressuretosuppressvaporisationAPIPipingPlansAPI冲洗方案+=PointstoNoteforAPIPlan14:-Flowbacktosuctionsidewillevacuatevapou

5、rsthatmaycollectinsealchamber.-Recommendedforlighthydrocarbonservice.APIPipingPlansAPI冲洗方案RecirculationfrompumpdischargethroughaflowcontrolorificeandcoolertosealOpenLoopCoolingCircuitCoolingWaterOutletCoolingWaterInletAPIPipingPlansAPI冲洗方案Recirculationfromapumpingring

6、inthesealchamberthroughcoolerandbacktosealClosedLoopCoolingCircuitThroatbushingSuctionDischarge18-24"VentathighestpointofthepipingCoolingWaterOutletCoolingWaterInletmechanicalsealwithpumpingringHeatexchangerAPIPipingPlansAPI冲洗方案PointstonoteforAPIPlan23:Thermosyphondes

7、ign*heatexchanger18to24"abovepumpcentreline.*Preventoverheatinginstandbyandstart–up.Installclosefittingneckbushingatthebottomofsealchambertoisolatetheheatfromtheimpellerend.Usedonhightemperatureapplicationstominimiseheatloadonthecoolerbycoolingonlysmallamountofliquid

8、thatisrecirculated.ForhightemperatureboilerfeedpumpapplicationsOtherapplications*hightemperatureliquidclosetobubblepoint.AP