标准名称：	２ＣＣ１２６型硅调频变容二极管
英文名称：	Detail specification for silicon frequency modulated variable capacitance diodes,Type 2CC126
中标分类：	能源、核技术 >> 能源、核技术综合 >> 技术管理
发布日期：	1981-05-05
实施日期：	1982-01-01
首发日期：	1900-01-01
作废日期：	2010-01-20
出版日期：	1900-01-01
页数：	2页

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【英文标准名称】:AnInvestigationofFlammableGasesorVaporswithRespecttoExplosion-ProofElectricalEquipment
【原文标准名称】:一项针对防爆电气设备的易燃气体或蒸气调查
【标准号】:ULTR58-1993
【标准状态】:现行
【国别】:美国
【发布日期】:1993-07-23
【实施或试行日期】:
【发布单位】:美国保险商实验所(US-UL)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:ThisisareportoftheinitialinvestigationconductedbyUnderwriters'LaboratoriesInc.toestablishaprocedureforclassifyingadditionalflammablegasesorvaporswithinGroupsA,B,C,andDofClassIhazardouslocationsasdefinedbytheNationalElectricalCode.Thisprocedureprovidesameansofincreasingtheutilityofpresentlyrecognizedexplosion-proofelectricalequipmentwithoutthenecessityofadditionalexpensiveandlaborioustestingofsuchequipment.UsingatestfacilitydesignedandconstructedbyUnderwriter'sLaboratoriesInc.comparativeexperimentaldataonflamepropagationandexplosioneffects,withspecialreferencetoexplosion-proofelectricalequipment,havebeenobtainedforfifteenflammableandnonflammablegasesorvolatilechemicalmaterialsnetpreviouslyclassified.Featuresinvestigatedincludedthemaximumexplosionpressuredevelopedbytheparticulargas-orvapor-airmixtureunderpertinenttestconditions,andthewidthsandclearancesinmetal-to-metaljointsthatwillarrestflamepropagation.Theprimaryexplosionchamber,12inchininternaldiameterwithaninternalvolumeofonecubicfoot,isprovidedwithavariabletestjointassembly,meansforinducinginitialturbulenceinthetestmixturepriortoignition,andanoptional10-footsectionof1-1/2inchsizeconduitforstudiesofexplosionpressurepilingeffects.Toarriveattheproposedclassifications,theflamepropagationandexplosioneffectsofeachgasorvapor,togetherwithitsignitiontemperature,werecomparedwiththecorrespondingcharacteristicsofacetylene(GroupA),hydrogen(GroupB),diethylether(GroupC),andgasoline(GroupD)asdeterminedunderthesametestconditions.TheGroupclassificationofthesefourreferencematerialshaslongbeenestablishedwithinClassIhazardouslocations,andeachofthefourisconsideredrepresentativeoftheothergasesorvaporsclassedintherespectiveGroup.Onthebasisoftheresultsofthisinvestigation,fourteengasesorvaporshavebeenaddedtotheGroupclassificationswithinClassIhazardouslocationsasfollows:ClassI,GroupB-Butadiene,ethyleneoxide,andpropyleneoxide.ClassI,GroupC-Acetaldehyde,isoprene,andunsymmetricaldimethylhydrazine.ClassI,GroupD-Acrylonitrile,ammonia(anhydrous),ethylenedichloride,propylene,styrene,vinylacetate,vinylchloride,andpara-xylene.Carbondisulfide,thefifteenthmaterialinvestigatedwouldnotbeclassifiedinanyofthefourGroupsofClassIhazardouslocations.BecauseofitsIowignitiontemperatureandtheverycloseclearancesbetweensurfacesnecessarytoarrestitsflamepropagation,carbondisulfiderequiressafeguardsbeyondthoserequiredforanyofthepresentGroups.PartIIreportsonaninvestigationconductedbyUnderwritersLaboratoriesInc.toclassifyadditionalgasesorvaporswithinGroupsA,B,C,andDofClassIhazardouslocationsasdefinedbytheNationalElectricalCode,NFPANo.70-1975,ANSIC1-1975.
【中国标准分类号】:K35
【国际标准分类号】:
【页数】:104
【正文语种】:英语