【英文标准名称】:StandardTestMethodfor(AnalyticalProcedure)DeterminingTransmissivityofConfinedNonleakyAquifersbyCriticallyDampedWellResponsetoInstantaneousChangeinHead(Slug)
【原文标准名称】:通过临界阻尼井回应顶部瞬息变化测定承压非越流性含水土层渗透性的标准试验方法(分析程序)
【标准号】:ASTMD5881-1995(2005)
【标准状态】:现行
【国别】:
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:液压导电率;含水土层系统;气压计的变化;监视井;有关应用;根据头的随时变化;地下水;过阻尼井;抽水率;储水系数;低阻尼井;水位观测;承压非越流性含水土层;冲击试验;灾害;过滤系数;环境控制;含水土层;土壤
【英文主题词】:aquifer;aquifertests;groundwater;hydraulicconductivity;observationwells;slugtest;storagecoefficient;transmissivity
【摘要】:Theassumptionsofthephysicalsystemaregivenasfollows:6.1.1Theaquiferisofuniformthickness,withimpermeableupperandlowerconfiningboundaries.6.1.2Theaquiferisofconstanthomogeneousporosityandmatrixcompressibilityandconstanthomogeneousandisotropichydraulicconductivity.6.1.3Theoriginofthecylindricalcoordinatesystemistakentobeonthewell-boreaxisatthetopoftheaquifer.6.1.4Theaquiferisfullyscreened.6.1.5Thewellis100%efficient,thatis,theskinfactor,f,anddimensionlessskinfactor,x03C3;,arezero.Theassumptionsmadeindefiningthemomentumbalanceareasfollows:6.2.1Theaveragewatervelocityinthewellisapproximatelyconstantoverthewell-boresection.6.2.2Frictionalheadlossesfromflowinthewellarenegligible.6.2.3Flowthroughthewellscreenisuniformlydistributedovertheentireaquiferthickness.6.2.4Changeinmomentumfromthewatervelocitychangingfromradialflowthroughthescreentoverticalflowinthewellarenegligible.1.1Thistestmethodcoversdeterminationoftransmissivityfromthemeasurementofwater-levelresponsetoasuddenchangeofwaterlevelinawell-aquifersystemcharacterizedasbeingcriticallydampedorinthetransitionrangefromunderdampedtooverdamped.Underdampedresponseischaracterizedbyoscillatorychangesinwaterlevel;overdampedresponseischaracterizedbyreturnofthewaterleveltotheinitialstaticlevelinanapproximatelyexponentialmanner.OverdampedresponseiscoveredinGuideD4043;underdampedresponseiscoveredinD5785.1.2TheanalyticalprocedureinthistestmethodisusedinconjunctionwithGuideD4043andthefieldprocedureinTestMethodD4044forcollectionoftestdata.1.3Limitations8212;Slugtestsareconsideredtoprovideanestimateofthetransmissivityofanaquifernearthewellscreen.Themethodisapplicableforsystemsinwhichthedampingparameter,950;,iswithintherangefrom0.2through5.0.Theassumptionsofthemethodprescribeafullypenetratingwell(awellopenthroughthefullthicknessoftheaquifer)inaconfined,nonleakyaquifer.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P22
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:


【英文标准名称】:StandardSpecificationforSeamlessandWeldedTitaniumandTitaniumAlloyTubesforCondensersandHeatExchangers
【原文标准名称】:冷凝器和热交换器用无缝及焊接钛与钛合金管标准规范
【标准号】:ASTMB338-1999
【标准状态】:作废
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:管;蒸汽冷凝器;热交换器;冷凝器;有色金属;钛;钛合金
【英文主题词】:pipes;titaniumalloys;condensers;steamcondensers;heatexchangers;non-ferrousmetals;titanium
【摘要】:
【中国标准分类号】:H64;J75
【国际标准分类号】:23_040_15
【页数】:7P;A4
【正文语种】:英语