ASTM E499-1995(2006) 探测器探针方式用质谱仪检漏器检漏的试验方法

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【英文标准名称】:StandardTestMethodsforLeaksUsingtheMassSpectrometerLeakDetectorintheDetectorProbeMode
【原文标准名称】:探测器探针方式用质谱仪检漏器检漏的试验方法
【标准号】:ASTME499-1995(2006)
【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】:E07.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:试验;无损检验;检漏器;探测器;探测器;泄漏;质谱仪
【英文主题词】:belljarleaktest;bombmassspectrometerleaktest;heliumleaktest;heliumleaktesting;leaktesting;massspectrometerleaktesting;sealedobjectmassspectrometerleaktest
【摘要】:TestMethodAisfrequentlyusedtotestlargesystemsandcomplexpipinginstallationsthatcanbefilledwithatracegas.Heliumisnormallyused.Thetestmethodisusedtolocateleaksbutcannotbeusedtoquantifyexceptforapproximation.Caremustbetakentoprovidesufficientventilationtopreventincreasingtheheliumbackgroundatthetestsite.Resultsarelimitedbytheheliumbackgroundandthepercentageoftheleakingtracegascapturedbytheprobe.TestMethodBisusedtoincreasetheconcentrationoftracegascomingthroughtheleakbycapturingitwithinanenclosureuntilthesignalabovetheheliumbackgroundcanbedetected.Byintroducingacalibratedleakintothesamevolumeforarecordedtimeinterval,leakratescanbemeasured.1.1Thesetestmethodscoverproceduresfortestingandlocatingthesourcesofgasleakingattherateof4.5x1013mol/s(1x108Stdcm3/s)orgreater.Thetestmaybeconductedonanydeviceorcomponentacrosswhichapressuredifferentialofheliumorothersuitabletracergasmaybecreated,andonwhichtheeffluentsideoftheleaktobetestedisaccessibleforprobingwiththemassspectrometersamplingprobe.1.2Twotestmethodsaredescribed:1.2.1TestMethodA-Directprobing,and1.2.2TestMethodB-Accumulation.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H26
【国际标准分类号】:19_100
【页数】:6P.;A4
【正文语种】: