Designation:A1098/A1098M−16StandardSpecificationforWeldedAusteniticAlloySteelBoiler,Superheater,Condenser,andHeatExchangerTubeswithTexturedSurface(s)1ThisstandardisissuedunderthefixeddesignationA1098/A1098M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversaverageorminimum-wallthicknessweldedtubesmadefromvariousgradesofausteniticalloysteelmaterialsinwhichthe(1)externaltubesurface,(2)internaltubesurface,or(3)bothinternalandexternaltubesurfaceshaveatexturedconfigurationforimprovedheattransferorfluidfloworboth.Texturesurface(s)areproducedbycoldformingaspecifiedconfigurationonthesurface(s)ofbasestripmaterial,priortowelding.Theproducedweldedtexturedtubesmaybeusedinboilers,superheaters,condensers,evaporators,heatexchangers,andothersimilarheattransferapparatusindiametersuptoandincluding1.5in.[38mm]forvariouswallthicknessesuptoandincluding0.079in.[2mm].1.2Thetubingsizesandthicknessesusuallyfurnishedtothisspecificationare3⁄8in.[10mm]insidediameter(ID)to1.5in.[38mm]outsidediameterand0.020to0.079in.[0.5to2mm],inclusive,inwallthickness.Tubinghavingotherdimen-sionsmaybefurnishedprovidedsuchtubescomplywithallotherrequirementsofthisspecification.1.3Optionalsupplementaryrequirementsareprovidedand,whenoneormoreofthesearedesired,eachshallbesostatedintheorder.1.4Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Theinch-poundunitsshallapplyunlessthe“M”designationofthisspecificationisspecifiedintheorder.1.5ThefollowingsafetyhazardsstatementpertainsonlytothetestmethodandtheSupplementaryRequire...
