Designation:D1933−03(Reapproved2017)StandardSpecificationforNitrogenGasasanElectricalInsulatingMaterial1ThisstandardisissuedunderthefixeddesignationD1933;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthreetypesofnitrogenusedasanelectricalinsulatingmaterialinelectricalequipment:1.1.1TypeI,obtainedfromtheairbyliquefactionprocessesanddried,1.1.2TypeII,obtainedfromtheairbyliquefactionprocesses,deoxidizedwithhydrogenoveraplatinumcatalyst,anddried,and1.1.3TypeIII,obtainedfromtheairbyliquefactionpro-cessesandifnecessarydeoxidizedbysuitablemeans.NOTE1—Thefactthatmetalcontainersarefilledwithmaterialsmeetingthisspecificationdoesnotexcludethepossibilitythatthematerialsmightbecomecontaminatedwithunlistedimpurities.1.2Thefollowingsafetyhazardscaveatpertainsonlytothetestmethodportion,Section5,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2029TestMethodsforWaterVaporContentofElectricalInsulatingGasesbyMeasurementofDewPointE105PracticeforProbabilitySamplingofMaterialsE260PracticeforPackedColumnGasChromatography3.CompositionandProperties3.1Samplesextractedfromnitrogencontainersshallcon-formtotherequirementsprescribedinTable1.4.Sampling4.1NitrogenShippedasaGasinHigh-PressureMetalContainers—Extracttestspecimensfromthecontainerorcontainers,preferablybymeansofadual-stagehigh-pressuregasregulator,capableofreducinginletgaspressuresof15MPa(2200psi)toaconstantlowdischargepressure.Screwthepressureregulatorinletconnectionontothecontainervalveoutlet.Connecttheregulatoroutletconnectiontothegassamplingp...
