APIPipingPlansAPI冲洗方案APIPipingPlansAPI冲洗方案Integral(internal)recirculationfrompumpdischargetoseal内部循环从泵的出口到密封PointstoNoteforAPIPlan02:API02冲洗方案应注意的事项：Theinjectiontappingisusedforventingpriortostart–up.-在开车前，入口用来进行放空APIplan02isoftenusedtogetherwithplan62,especiallyonhightemperaturebellowsseals.冲洗方案2经常与62一起用，特别是用在高温波纹管密封PointstoNoteforAPIPlan11:API冲洗方案11应注意的事项-Useanorificetorestricttheflowrateifthedischargepressureis3barhigherthansealchamberpressure.如出口压力高于密封腔压力3bar，需要用一个孔板限制流量-Useoncleanandlowabrasivesduties用在干净，含磨蚀性颗粒少的工矿Recirculationfromsealchamberthroughaflowcontrolorificeandbacktopumpsuction从密封腔里出,通过一个孔板返回到泵的入口+RecirculationfrompumpdischargethroughaflowcontrolorificeandcoolertosealOpenLoopCoolingCircuitRecirculationfromapumpingringinthesealchamberthroughcoolerandbacktosealClosedLoopCoolingCircuit冲洗液通过密封腔中的泵效环从密封腔中流出经过换热器，再返回到密封中，形成自封闭循环。形成封闭的冷却回路Recirculationfrompumpdischargethroughacycloneseparatordeliveringcleanfluidtothesealandfluidwithsolidsbacktopumpsuctionline冲洗液从泵出口流出，通过一旋液分离器，使干净流体进入密封腔，带有颗粒的流体返回到泵入口处形成封闭循环PointstoNoteforAPIPlan32:对于APIplan32须注意:-Choseapropersourceofsealflushtoeliminatethepotentialforvaporisationoftheinjectedfluidandtoavoidcontaminationofthefluidbeingpumpedwiththeinjectedflush.选择合适的密封冲洗源，以减少冲洗流体的汽化，同时可避免冲洗流体被污染。-Installalabyrinthbushingatthebottomofthestuffingboxtocontroltheflushingandpressureifnecessary.--如有必要的话，在密封腔底部安装喉部衬套或迷宫密封来控制冲洗和压力。RecirculationfrompumpdischargethroughacycloneseparatordeliveringcleanfluidthroughacoolerandthentosealandfluidwithsolidsbacktopumpsuctionlineNeedlevalvePipingSystemsAfluidusedasalubricantorbufferbetweendualmechanicalseals.这种液体象缓冲剂，润滑剂用在双机械密封Thebufferfluidisalwaysatapressurelowerthanthepumpprocesspressurebeingsealed.缓冲液的压力通常低于被密封的介质的压力PumpingringPointstoNoteforAPIPlan52:TypicallyusedwithanArrangement2unpressuriseddualseal.通常用于不带压双封Duringnormaloperation,circulationismaintainedbyaninternalpumpingring.在正常操作情况下，通过腔内的泵效环维持循环Thereservoirisusuallycontinuouslyventedtoavapourrecoverysystemandism