SummaryofSignificantChangesinthe2021ASMEBoilerandPressureVesselCodeASMEBPVC.SSC.X.II.V-2021SectionXSectionIISectionVASMEBPVC.SSC.X.II.V-2021SummaryofSignificantChangesinthe2021ASMEBoilerandPressureVesselCodeSectionsX,II,andVTwoParkAvenue•NewYork,NY•10016USAxDateofIssuance:April23,2021ASMEdoesnotissuewrittenrepliestoinquiriesconcerningthispublication.Nopartofthisdocumentmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.TheAmericanSocietyofMechanicalEngineersTwoParkAvenue,NewYork,NY10016-5990Copyright©2021byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllrightsreservedPrintedinU.S.A.CONTENTSListofSectionsintheASMEBoilerandPressureVesselCode.................................ivForeword......................................................................vAcknowledgments................................................................viSECTIONX....................................................1Introduction....................................................1SignificantChanges....................................................2SECTIONII....................................................4Introduction....................................................4PartA....................................................5PartB....................................................9PartDCustomaryandMetric..................................12SECTIONV....................................................16Introduction....................................................16SignificantChanges....................................................17iiiLISTOFSECTIONSINTHEASMEBOILERANDPRESSUREVESSELCODEIRulesforConstructionofPowerBoilersIIMaterials•PartA—FerrousMaterialSpecifications•PartB—NonferrousMaterialSpecifications•PartC—SpecificationsforWeldingRods,Electrodes,andFillerMetals•PartD—Properties(Customary)•PartD—Properties(Metric)IIIRulesforConstructionofNuclearFacilityComponents•SubsectionNCA—GeneralRequirementsforDivision1...