Designation:G128/G128M−15StandardGuideforControlofHazardsandRisksinOxygenEnrichedSystems1ThisstandardisissuedunderthefixeddesignationG128/G128M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisguidecoversanoverviewoftheworkofASTMCommitteeG04onCompatibilityandSensitivityofMaterialsinOxygen-EnrichedAtmospheres.Itisastartingpointforthoseaskingthequestion:“Whataretherisksassociatedwithmyuseofoxygen?”Thisguideisanintroductiontotheuniqueconcernsthatmustbeaddressedinthehandlingofoxygen.Theprincipalhazardistheprospectofignitionwithresultantfire,explosion,orboth.Allfluidsystemsrequiredesignconsiderations,suchasadequatestrength,corrosionresistance,fatigueresistance,andpressuresafetyrelief.Inadditiontothesedesignconsiderations,onemustalsoconsidertheignitionmechanismsthatarespecifictoanoxygen-enrichedsystem.Thisguideoutlinestheseignitionmechanismsandtheap-proachtoreducingtherisks.1.2Thisguidealsolistsseveraloftherecognizedcausesofoxygensystemfiresanddescribesthemethodsavailabletopreventthem.Sourcesofinformationabouttheoxygenhazardanditscontrolarelistedandsummarized.TheprincipalfocusisonGuidesG63,G88,PracticeG93,andGuideG94.Usefuldocumentationfromotherresourcesandliteratureisalsocited.NOTE1—Thisguideisanoutgrowthofanearlier(1988)CommitteeG04videotapeadjunctentitledOxygenSafetyandarelatedpaperbyKoch2thatfocusedontherecognizedignitionsourceofadiabaticcompressionasoneofthemoresignificantbutoftenoverlookedcausesofoxygenfires.Thisguiderecapitulatesandupdatesmaterialinthevideotapeandpaper.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisst...
