【英文标准名称】:StandardTestMethodforMercaptansinNaturalGasUsingLength-of-StainDetectorTubes
【原文标准名称】:用色斑长度检测管测定天然气中的硫醇的标准试验方法
【标准号】:ASTMD1988-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:D03.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:天然气;试验
【英文主题词】:gaseousfuels;naturalgas
【摘要】:Themeasurementofmercaptansinnaturalgasisimportant,becausemercaptansareoftenaddedasodorantstonaturalgastoprovideawarningproperty.Theodorprovidedbythemercaptanservestowarnconsumers(forexample,residentialuse)ofnaturalgasleaksatlevelsthatarewellbelowtheflammableorsuffocatingconcentrationlevelsofnaturalgasinair.Fielddeterminationsofmercaptansinnaturalgasareimportantbecauseofthetendencyofthemercaptanconcentrationtofadeovertime.Thistestmethodprovidesinexpensivefieldscreeningofmercaptans.Thesystemdesignissuchthatitmaybeusedbynontechnicalpersonnel,withaminimumofpropertraining.1.1Thistestmethodcoversarapidandsimplefielddeterminationofmercaptansinnaturalgaspipelines.Availabledetectortubesprovideatotalmeasuringrangeof0.5to160ppmbyvolumeofmercaptans,althoughthemajorityofapplicationswillbeonthelowerendofthisrange(thatis,under20ppm).Besidestotalmercaptans,detectortubesarealsoavailableformethylmercaptan(0.5to100ppm),ethylmercaptan(0.5to120ppm),andbutylmercaptan(0.5to30mg/M179;or0.1to8ppm).Note18212;Certaindetectortubesarecalibratedintermsofmilligramspercubicmetre(mg/M179;)insteadofpartspermillionbyvolume.Theconversionisasfollowsfor25176;C(77176;F)and760mmHg.Equation1-mg/M179;=ppmXmolecularweight/24.451.2Detectortubesareusuallysubjecttointerferencesfromgasesandvaporsotherthanthetargetsubstance.Suchinterferencesmayvaryamongbrandsbecauseoftheuseofdifferentdetectionprinciples.Manydetectortubeswillhaveaprecleanselayerdesignedtoremoveinterferencesuptosomemaximumlevel.Consultmanufacturer''sinstructionsforspecificinterferenceinformation.Hydrogensulfideandothermercaptansareusuallyinterferencesonmercaptandetectortubes.SeeSection5forinterferencesofvariousmethodsofdetection.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,see7.3.
【中国标准分类号】:E24
【国际标准分类号】:75_060
【页数】:4P.;A4
【正文语种】: