悬挂器、四通试验-15k芯轴式油管sy0148rev

PR2性能试验大PerformanceVerificationTest参照（Reference）ISO104232003AnnexFPR2No.：SY-版本号码：RevVER-2组套管挂规2GroupCasingHanger11”2组套管挂额定工作压力2GroupCasingHangerRatedWorkingCasingHangerTemperatureClassUCasingHangerTemperatureOperatingRange-套管挂材料等CasingHanger套管挂部件CasingPartCasingHangerSerialCasingHangerDrawing编写WrittenBy:Wang 检查CheckedBy:ZhangHanguo ApprovedBy: Li 试验目 Test 试验标 Test 术语和定 Termsand 试验介 Testing 温度试 Temperature 保压周 Hold 气压试 Gas 试验顺 Test 泄漏检 Leak 试验过程中套管挂的组 CasingHangerassemblyunder 第检验机 Independentcertifyingauthority 试验偏 Deviationsfrom 试验前准备工 Pre-testing 试验样机一 Testing 套管挂装配前检 Pre-assemblinginspectionfortheCasing 安全防护工 Safetyand 套管挂PR2性能试 PR2PerformancetestingofCasing 室温下的载荷循环试验(参照 CasingHangerloadcyclingtestatroomtemperature(Refto 套管挂带载荷的压力/温度循环试验（参照ISO10423F.1.11和 Bodypressure/Temperaturecyclestestwithload（RefertoISO10423F.1.11andF.2.13).试验后检测（参照ISO10423 PostTestExamination(RefISO10423 相关文 记 PR2性能试验第一部PR2TestPart目的、标准和术语定Purpose、TeststandardTermsand编写WrittenBy:Wang 检查CheckedBy:ZhangHanguo ApprovedBy:LiJun TestISO10423:2003FPR2TheperformanceofCasingHangeristestedaccordingtotherequirementsofISO10423:2003annexFPR2TestISO10423:2003FISO10423:2003annexFTermsandTestingGaspressureAir,nitrogen,methaneorothergasesormixturesofgasesmaybeISO10423F.1.8c3.6AsperISO10423F.1.8c，gastestingatroomtemperatureshallbeconductedwithamethodforleakdetectionfordetailsofgasleakagedetectionmethod,pleaserefertosection3.6.TemperatureTesting温度可以被测量，测量装置应在一个13mm（0.5in）的通孔内与被试验设备接触，且距由其他设备上封存液润湿表面13mm（0.5in）以内。Temperatureshallbemeasuredincontactwiththeequipmentbeingtestedandwithin13mm(0.5ofthethrough-bore,whereapplicable,andwithin13mm(0.5in)ofthesurfacewettedbytheretainedfluidfromotherequipment;Theheatingforumtemperature121℃),Theheatingforumtemperaturetestingmaybeappliedinternallyinthethough-boreexternally.theheatingshallbeappliedsuchthattheentirethrough-boreorequivalentwettedsurfaceisatoraboveumtemperature(≥121℃),orsuchthatallfluidusedforheatingcontainedwithinthearticlesisatorabovetheumtemperature.Thecoolingfortheminimumtemperature18℃)的低温箱内,使整个被测物表面都能处于最低温度，可通过对温箱里氮和适当比混来获得适的低温验温度Thetestedobjectsshouldbeheldinthecoolingboxattheminimumtemperature(≤-18℃),whichmakestheentiresurfaceofobjectsatminimumtemperatureappropriatelowexperimenttemperatureisgainedthroughtheproportionalcombinationoffluidnitrogenandalcoholincoolingbox.RecordingoftheAlltemperaturesshallberecordedonchartrecorderssimultaneouslywithappliedpressuresandactualtimeoftestensureschartrecordercontinuallyrecordspressureandtemperature.Certificationoftest所有温度和压力试验都要参照试验大纲，每一步温度和压力记录结果均应经过MSP，客户及第检测机构AlltemperatureandpressurechartrecordsshallreferencetestproceduresectionsandshallbeverifiedandsignedbyMSP,clientandindependentcertifyingauthorityuponcompletionofeachHoldStartofhold保压期应在压力和温度已呈稳定，试验设备和所带的压力监测装置已与压力源以后开始。此时，将供压Holdperiodsshallbestartedafterpressureandtemperaturestabilizationhasoccurredandequipmentwithpressuremonitoringdevicehasbeenisolatedfromthepressuresourceandpumpventvalvesopenedthetimespecifiedforholdtimesshallbeaminimum.Pressureperhouror500PSI/hour,whicheverislesspressureshallremainwithin5%ofthetestpressureorwithin500PSI,whicheverisless,duringtheholdperiodstabilizationperiodshallbeaminimumof1hourpriortostartofanytestholdperiodanyrateofchangeshallbeyzedtoproveitisnotaleakpriortostartofanyholdperiod.Temperature当每分钟温度变化小于0.5℃1°F但不应超过最大值11℃(20°F)以上。Temperatureshallbeconsideredstabilizedwhentherateofchangeislessthan0.5℃per(1°Fperminute)thetemperatureshallremainatorbeyondtheextremeduringtheholdbutshallnotexceedtheextremebymorethan11℃(20GasTestingAir,nitrogen,methaneorothergasesormixturesofgasesmaybe34.5Mpa(5,000PSI)Equipmentfor34.5Mpa(5，000PSI)and34.5Mpa(5,000PSI)Testfailsatest,thenCasingHangershallbere-testedagainfromsection5.1dateandtimeshallberecordedateachsectiononbothtestprocedureandchartrecorderrecords.EachsectionoftestprocedureandapplicablechartrecorderrecordsshallbesignedbyMSP,clientandindependentcertifyingauthoritybeforestartingnextsection.Leak高温、低温和内压等气压试验，泄漏检测应该提供两只（offpressure）压力监测装置。保压前的稳定期应25～753.3.2新连接，压力泵要，稳定或保压期间泄压阀保持开启。Maxandmintemperaturegastesting，leakdetectionshallbeprovedbyuseof2offpressuremonitoringdevices：1offcalibratedlargescale(minimum200mmdiameter)dialgaugewithsuchthattestpressureis50%offullscale,1offcalibrateddigitalpressureindicatorwithratingsuchthattestpressureis50%offullscale,stabilizationshallassection3.3.2,Acceptancecriteriashallbe"pressurechangeshallbelessthan5%oftestpressureor500PSIwhicheveristheless"however,stabilizationshallbeprovedsuchthatanypressurechangeisnotaleaknote:innocircumstancesshallthepumpbereconnectedpumpshallbeisolatedandpumpventvalvesopenedforthedurationofthetest.CasingHangerassemblyunder在从5.1节开始到5.4节试验后的检测开始前的整个试验过程中,组装好的套管挂不能扰，拆卸，修理。TheCasingHangerassemblyundertestshallnotbedisturbed,disassembled,repairedfromthestartofthetest,section5.1untilcommencementofposttestexamination,section5.3第检验机IndependentcertifyingauthorityDeviationsfromAnydeviationsfromtestprocedureshallbeapprovedinwritingbyPR2性能试验第二部PR2TestPart试验前准备工Pre-testing编写WrittenBy:Wang 检查CheckedBy:ZhangHanguo Approved Li Pre-testingTesting11”15k×7A11”15k×7”CasingHangerandothertestingfixtures,structuredrawingasshownPre-assemblinginspectionfortheCasing所有测量设备应根据API6A要求校准检测合格，并在有效期内。Beforeassembling,allthepartsmustbeprovedtobeinaccordancewiththerequiredsizerecorded.Alldetailsarelistedin(partsinspectionrecord).AllthenelengagingintestingmustbequalifiedaccordingtoAPI6A.AlltheequipmentsandfixturesshouldbeadjustedandprovedinaccordancewithAPI6Aandwithinvalidity.SafetyandSafetyandprotectionshouldbeconsideredandappliedinaccordancewithMSP-drilexstandardthesafetyforthe nelandequipmentinvolvedshouldbeconsidered.ThepreparationfortestingThediagramoftestingBCDBCDAEEFGAEEFGTheintroductionforthemaintestingA区：控制中心部分（序列号：MSP-PR2-AreaA:controlcenter(SerialNo.:MSP-PR2-01):（seeannexForenlargedAAAFunctionCollecttemperature,pressure,torqueetc.andmakerecord.Dataprocess,carryoutrelatedtestprocedureasperpre-scheduledcomputerprogramandthenrealizetheautomaticcontrolfortestBDatacollectionmodular,relayoutputmodular,rs485communicationmodular,controlboard(gaugeboard,computer,monitorequipmentetc.)C区：高温试验室机构（序列号：MSP-PR2-AreaC:maxtemperaturesupplysystem(SerialNo.:MSP-PR2-03)（seeannexForenlargeda实现试验过程中温度的自动调节，实现试验温度范围室温至140℃，温度波动不大于每分钟0.5℃(1°FFunctionAdjustingthetemperatureautomaticallyduringthetest,thetemperaturerangefromroomtemperatureto140℃,fluctuationofthetemperatureshouldwithin0.5℃(1°F)perminute.Throughrs485orotherpassageway,sendthetemperaturebacktocontrolcenterandcarryouttheworkingorder.device,temperaturesensor,D区：试验压力供给机构（序列号：MSP-PR2-AreaD:pressuresupplysystem(SerialNo.:MSP-PR2-04)（seeannexForenlargedDAD对试验设备进行试验；可以打水压或者气压；可以调节供给压力大小，使之升高、降低或泄压；用电控utilizationelectricalcontrolledorgascontrolledhighpressureneedleCasingHangertoshiftwaterorgaspressuretorealizeautomaticcontrol.B；Highpressuregaspump,gascontrolledhighpressureneedleCasingHanger,calibratedpressuregauge(includinglow/highpressure),highpressurepipeline,x-over,integratedconnector,wasteliquidpool,nitrogen,pressuresensor(forprecisionconcern,highandlowpressuresensorbothF区：低温试验室机构（序列号：MSP-PR2-AreaF:lowtemperaturetestingsystem(SerialNo.:MSP-PR2-FF液liquidA实现试验过程中温度的自动调节，实现试验温度范围室温至－60℃，温度波动不大于每分钟0.5℃1°FFunctionRealizeautoadjustingoftemperatureduringthetest,realizetemperaturerangefromroomtemperatureto－60℃,andfluctuationofthetemperatureshouldwithin0.5℃(1°F)perminutesendtemperaturedatabacktocontrolcenterthroughrs485orotherpassagewayandcarryouttheworkingorder.Lowtemperaturebox,liquidnitrogencan,autoadjustingequipment,chokeCasingHanger,temperaturesensoretc.G区：其他试验设备（序列号：MSP-PR2-AreaG:othertestingequipment（SerialNo.:MSP-PR2-Function:measurement,recordequipmentandassociatedtoolsfortheComposition:pressureandtemperaturechartrecorder,digitaltorquespanner,measurementtoolandinstallationtoolsetc.G其他设备和工otherequipmentand试验主要设备组成明细（如图4.4.1所示Listofthemaintestingequipment（refertoThelistofthemaintestingequipmentforPR2MainEquip1ControlcenterSerial1 board,computer,monitor12出模块、rs485datacollectionmodular,relayoutputmodular,rs485communication13Othersupplement2AndtemperaturesupplysystemSerialNo132temperature13Hanger14supplement3TestingpressuresupplysystemSerialNo1pressure22气动控制针阀pneedleCasing53Pressure24Highpressuregas15 aticreversalCasingHanger6617 aticonewayCasingHanger18Oil19CasingHangerwithpressure1Othersupplement4LowtemperaturesupplysystemSerialNo.:1Lowtemperature12Liquidnitrogen13Autoadjusting14ChokeCasing15Temperature16Othersupplement5OthertestingSerialNo.MSP-PR2-1diagramrecorder12113Stackup14Hydraulicpress15OthersupplementLocationofpressureandtemperaturesuchthattestpressureis50%offullscaleingasline.1":Pressuretransmitterforcalibratedpressureandtemperaturechartrecorderingas2':Temperaturetransmitterfordigitaltemperatureonthebottomoftheentiretest2":Temperaturetransmitterforcalibratedpressureandtemperaturechartrecorderonthebottomoftheentiretestdevice.套管挂PR2性能PR2PerformancetestingofCasingPR2性能试验第三部PR2TestPartLoadCyclingTest编写WrittenBy:Wang 检查CheckedBy:ZhangHanguo ApprovedBy: Li 室温下的载荷循环试验(参照CasingHangerloadcyclingtestatroomtemperature(ReftoTestaCalibratedpressure（序列号SerialNo.：MSP-PR2-04-bCalibratedpressureandtemperaturechart（序列号SerialNo.：MSP-PR2-07-cCalibratedcompression（序列号SerialNo.：MSP-PR2-07-Testingtemperature:RoomCalculatethetesta250m，磅级：53.5lb/in=79.62kg/m，重量为：250×79.62×10=199050N199.1KN。用压力来模拟管材的重量，套管挂的受力面积的直径为：342.6mm，根据管材的重量和套管挂的受力面积直径，计算模拟压力为：199.1×103/(π×342.62/42.2Mpa313Theminimumratedloadistheweightofcasinghangbycasinghanger,casinglengthis250m,nominallinearmassis53.5lb/in=79.62kg/m,sotheweightis250×79.62×10=199050N=199.1KN.Youcanusetheforceofpressuretosimulatingtheweightofcasing,thediameterofforceareaofcasingtocalculatesimulatingpressureis199.1×103/(π×342.62/4)=2.2Mpa=310PSI.b最大额定载荷：最大载荷为芯轴式悬挂器所挂的管子的重量加上管液的重量，套管内径为：216.8mm，假设密度为1,6000N/m3，的重量为：π×(216.8/1000)2/4×250×1,6000=147.6KN，所以总重为：199.1147.6346.7KN.342.6mm，根据管材的重量和套管挂的受力面积直径，计算模拟压力为：346.7×103/(π×342.62/4)=3.8Mpa=560PSI。Theumratedloadistheweightofcasinghangbycasinghanger,plustheweightoffluidincasing.Theinternaldiameterofcasingis58.04mm,Assumingthefluiddensityis1,6000N/m3sotheweightoffluidis：π×(216.8/1000)2/4×250×1,6000147.6KN，sothetotalweightis+147.6=346.7KN.Youcanusetheforceofpressuretosimulatingtheweightofcasing,thediameterofforceareaofcasinghangeris342.6mm,youcanusetheweightofcasingandthediameterofforceareaofcasinghangertocalculatesimulatingpressureis346.7×103/(π×342.62/4)=3.8Mpa=560PSI.TestingConnecttestequipmentasperthetesting从套管挂A侧施加压力560PSIPressuretestto560PSItothehangerfromCsidetosimulatetheumratedloadHoldthepressurefor5Decreasingpressureto310PSIfromCsidetosimulatetheminimumratedloadHoldthepressurefor5Increasingpressureto560PSIfromCsidetosimulatetheumratedloadHoldthepressurefor5Decreasingpressureto310PSIfromCsidetosimulatetheminimumratedloadHoldthepressurefor5Increasingpressureto560PSIfromCsidetosimulatetheumratedloadHoldthepressurefor5h.A侧的压力减小至0Decreasingpressureto310PSIfromC5.1.6AcceptanceThevaluesofcompressiontransmittershallnolessthantheratedvaluesduringtheholdEachholdperiodshouldnolessthan55.1.7Testrecord:MandrelHangerLoadcyclingcapacityTestRecord油管挂载荷循环试验MandrelHangerLoadCyclingCapacityTestPartsNo.:Starting

Testtemp:Endingtime:1Increasingtoumratedload56025Hold53Decreasingtominimumratedload31045Hold55Increasingtoumratedload56065Hold57Decreasingtominimumratedload31085Hold59Increasingtoumratedload5605Hold50Decreasingtominimumrated0AcceptanceThevaluesofcompressiontransmittershallnolessthantheratedvaluesduringtheholdEachholdperiodshouldnolessthan5TestMSP试验人

客户或第认证机CustomerandCertifying

PR2性能试验第四部PR2TestPartCasingHangerPressure/TemperatureCyclesTestWithLoad编写WrittenBy:Wang 检查Checked Zhang ApprovedBy:Li （参照ISO10423F.1.11和Bodypressure/Temperaturecyclestestwithload（RefertoISO10423F.1.11andTestaCalibratedpressure（SerialNo.：MSP-PR2-10-bCalibratedpressureandtemperaturechart（SerialNo.：MSP-PR2-07-Test试验温度：-Testtemperature：-Calculatethetest量和套管挂的受力面积直径，计算模拟压力为：346.7×103/(π×342.62/43.8Mpa560PSI。因为套管挂的工作压力为15,000PSI，因此该试验中，额定工作压力对应的试验压力为15，560PSI，额定工作压力的50%对应的试验压力是8,060PSI，额定工作压力的5%对应的试验压力是1,310PSI，额定工作压力的10%对应的试验压力是2,060PSI。Theumratedloadis346.7KN,Youcanusetheforceofpressuretosimulatingtheweightofcasing,thediameterofforceareaofcasinghangeris342.6mm,youcanusetheweightofcasing×342.62/4)=3.8Mpa=560PSI.Becausetheworkpressureofcasinghangeris15,000PSI,sothetestpressureis15,560PSIofratedworkingpressure,thetestpressureis8,060PSIof50%ofratedworkingpressure,thetestpressureis1,310PSIof5%ofratedworkingpressure,thetestpressureis2,060PSIof10%ofratedworkingpressure.套管挂带载荷的压力/温度循环试验步骤Bodypressure/TemperaturecyclestestshouldfollowtheprocedureasaConnecttestequipmentasperthetestingEnsuretheCasingHangerisatroomtemperature，ensurechartrecordercontinuallyrecordspressureandtemperaturethroughouttestc121HeattheCasingHangertod在套管挂的A侧通压泵加压达到试验压力15,560PSI，保压至少1小时，然后泄压。在整个试验过程中，试验温度不能低于1211321小时。当每小时试验压力的变化不大于500PSI，应认为压力稳定。在整个保压期间，每小时压力变化应保持压力500PSI。ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger，thenreleasethepressure.Temperatureshallnotfallbelow121℃orexceed132℃.Ensurepressurehasstabilized.Stabilizationshallbeaminimumof1hour,pressureshallbeconsideredstabilizedwhentherateofchangeisnomorethan500PSIperhour.Pressureshallremainwithin500PSIduringtheholdperiod.e18℃CooldowntheCasingHangerto-f在套管挂的A侧通压泵加压达到试验压力15,560PSI，保压至少1小时，然后泄压。在整个试验过程中，变化不大于500PSI，应认为压力稳定。在整个保压期间，每小时压力变化应保持压力500PSI。ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger,andthenreleasethepressure.Temperatureshallnotgoabove-18℃orbelow-29℃.Ensurepressurewhentherateofchangeisnomorethan500PSIperhour.Pressureshallremainwithin500PSIduringtheholdperiod.gHeattheCasingHangertoroomh15,560PSI，然后加热套管挂，升温至121（见3.2），升温过程中，要保持50%～持续保持30分钟，然后可以进行下一步。在整个试验过程中，试验温度不能低于121℃或高于132℃。ApplyPressuretotestingpressure15,560PSIatroomtemperature,thenheattheCasingHangerto121℃asspecifiedinsection3.2andpayattentiontokeep50%～100%ratedworkingpressure5,000～15,000PSI)intheheatingprocess.Verifyumtemperaturehasbeenreachedandstabilizedatachangeratelessthan0.5degreesperminutefor30minutesbeforeproceedingtonextstep.Temperatureshallnotfallbelow121℃orexceed132℃.于500PSI，应认为压力稳定。在整个保压期间，每小时压力变化应保持压力500PSI。ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger.Temperatureshallnotfallbelow121℃orexceed132℃.Ensurepressurehasstabilized,stabilizationshallbeaminimumof1hourPressureshallbeconsideredstabilizedwhentherateofchangeisnomorethan500PSIperhour.Pressureshallremainwithin500PSIduringthehold3.2（8,060PI～15,60PICooldowntheactuatorto-18℃andpayattentiontokeep50%～100%ratedworkingpressure(8,060PSI～15,560PSI)intheprocessVerifyminimumtemperaturehasbeenreachedandstabilizedatachangeratelessthan0.5degreesperminutefor30minutesbeforeproceedingtonextstep.Temperatureshallnotgoabove-18℃orbelow-29℃.ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger.shallbeaminimumof1hourPressureshallbeconsideredstabilizedwhentherateofchangeisnomorethan500PSIperhour.Pressureshallremainwithin500PSIduringtheholdperiod.l50%～100%（8,060PSI～15,560PSI）HeattheCasingHangertoroomtemperatureandpayattentiontokeep50%～100%ratedworkingpressure(8,060PSI～15,560PSI)intheheatingprocess.m121Releasethepressure,thenheattheCasingHangerton在套管挂的A侧通压泵加压达到试验压力15,560PSI，保压至少1小时，然后泄压。在整个试验过程中，试验温度不能低于1211321小时。当每小时试验压力的变化不大于500PSI，应认为压力稳定。在整个保压期间，每小时压力变化应保持压力500PSI。ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger，thenreleasethepressure.Temperatureshallnotfallbelow121℃orexceed132℃.Ensurepressurehasstabilized.Stabilizationshallbeaminimumof1hour,pressureshallbeconsideredstabilizedwhentherateofchangeisnomorethan500PSIofthetestpressureperhour.Pressureshallremainwithin500PSIduringtheholdperiod.o18℃CooldowntheCasingHangerto-p在套管挂的A侧通压泵加压达到试验压力15,560PSI，保压至少1小时，然后泄压。在整个试验过程中，变化不大于500PSI，应认为压力稳定。在整个保压期间，每小时压力变化应保持压力500PSI。ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger,andthenreleasethepressure.Temperatureshallnotgoabove-18℃orbelow-29℃.Ensurepressurewhentherateofchangeisnomorethan500PSIperhour.Pressureshallremainwithin500PSIduringtheholdperiod.qHeattheCasingHangertoroomr在套管挂的A侧通压泵加压达到试验压力15,560PSI，保压至少1小时，然后泄压。在整个试验过程中，要确保压力稳定，压力稳定周期至少1小时。当每小时试验压力的变化不大于500PSI，应认为压力稳定。在ApplyPressuretotestingpressure15,560PSIforminimumholdperiodof1hourfromCsideofhanger,andthenreleasethepressure.Ensurepressurehasstabilized,stabilizationshallbeaminimumof1hourPressureshallbeconsideredstabilizedwhentherateofchangeisnomorethan500PSIperhour.Pressureshallremainwithin500PSIduringtheholdperiod.5～10%（1,30～2,06PSI，ApplyPressureto5%～10%ofratedpressure(1,310～2,060PSI)forminimumholdperiodof1hourfromCsideofhanger,thenreleasethepressure.Ensurepressurehasstabilized,stabilizationshallbeaminimumof1hourPressureshallbeconsideredstabilizedwhentherateofchangeisduringtheholdperiod.Acceptancea500Lowtemperatureshallnotgoabove18℃orbelow29℃andhightemperatureshallnotfallbelow121℃orexceed132℃throughouttestduration.TestrecordBodypressure/TemperaturecyclestestRecordwithload套管挂带载荷的压力/温度循环试验记录Bodypressure/TemperaturecyclestestRecordWithPartTestmedia:Starting

Ending1RecordroomRoomHeatinguptohighAIncreasepressureatAKeePressurefluctuationduringReleasingCoolingofftolowtest-18℃～-AIncreasepressureatAKeePressurefluctuationduringReleasingIncreasetemptotheambientRoom2AIncreasepressureatAHeatinguptohighDuringheatingupprocess,maintainpressurescopeAfterreachingmaxratingtemperature,adjusttheatCsidetotheworkingNotempchanging,keeit30KeePressurefluctuationTempfluctuationCoolingofftolowtest-18℃～-Duringcoolingdownprocess,maintainpressurescopeAfterreachingminratingtemperature,adjusttheatCsidetotheworkingNotempchanging,keeit30KeePressurefluctuationduringTempfluctuationduring-18℃～-IncreasetemptotheambientRoomDuringheatingupprocess,maintainpressurescopeReleasing3HeatinguptohighAIncreasepressureatAKeePressurefluctuationduringReleasingCoolingofftolowtest-18℃～-AIncreasepressureatAKeePressurefluctuationReleasingIncreasetemptotheambientRoom4AIncreasepressureatAKeePressurefluctuationduringReleasingAIncreasepressureatAKeePressurefluctuationduringReleasingAcceptanceaPressurefluctuationperhourshou