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VIIRECOMMENDEDGUIDELINESFORTHECAREOFPOWERBOILERSASMEBoilerandPressureVesselCommitteeSubcommitteeonPowerBoilersDateofIssuance:July1,2007(IncludesallAddendadatedJuly2006andearlier)ThisinternationalcodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandardsanditisanAmericanNationalStandard.TheStandardsComtnitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfro111competentandconcernedinterestshavehadanopportunitytoparticipate.Theproposedcodeorstandardwasmadeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatoryagencies,andthepublic-at-large.ASMEdoesnotapprove,rate,orendorseanyitem,construction,proprietarydevice,oractivity.ASMEdoesnottakeanypositionwithrespecttothevalidityofanypatentrightsassertedinconnectionwithanyitemsmentionedinthisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtheriskofinfringementofsuchrights,isentirelytheirownresponsibility.Participationbyfedcralagencyrepresentative(s)orperson(s)affiliatedwithindustryisnottobeinterpretedasgovernmentorindustryendorsementofthiscodeorstandard.ASMEacceptsresponsibilityforonlythoseinterpretationsofthisdocumentissuedinaccordancewiththeestablishedASMEproceduresandpolicies,whichprecludestheissuanceofinterpretationsbyindividuals.Thefootnotesinthisdocu~nentarepartofthisAmericanNationalStandard.TheaboveASMEsytnbolsareregisteredintheU.S.PatentOffice.ASMEisthetrademarkoftheAmericanSocietyofMechanicalEngineers.Nopartofthisdocumenttnaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.LibraryofCongressCatalogCardNumber:56-3934PrintedintheUnitedStatesofAmericaAdoptedbytheCounciloftheAmericanSocietyofMechanicalEngineers,1914.Revised1940,1941,1943,1946,1949,1952,1953,1956,1959,1962,1965,1968,1971,1974,1977,1980,1983,1986,1989,1992,1995,1998,2001,2004,2007TheAmericanSocietyofMechanicalEngineersThreeParkAvenue,NewYork,NY10016-5990CopyrightO2007byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllRightsReserved2007ASMEBOILERANDPRESSUREVESSELCODESECTIONSIRulesforConstructionofPowerBoilersI1MaterialsPartA-FerrousMaterialSpecificationsPartB-NonferrousMaterialSpecificationsPartC-SpecificationsforWeldingRods,Electrodes,andFillerMetalsPartD-Properties(Customary)PartD-Properties(Metric)I11RulesforConstructionofNuclearFacilityComponentsSubsectionNCA-GeneralRequirementsforDivision1andDivision2Division1SubsectionNB-Class1ComponentsSubsectionNC-Class2ComponentsSubsectionND-Class3ComponentsSubsectionNE-ClassMCComponentsSubsectionNF-SupportsSubsectionNG-CoreSupportStructuresSubsectionNH-Class1ComponentsinElevatedTemperatureServiceAppendicesDivision2-CodeforConcreteContainmentsDivision3-ContainmentsforTransportationandStorageofSpentNuclearFuelandHighLevelRadioactiveMaterialandWasteIVRulesforConstructionofHeatingBoilersVNondestructiveExaminationVIRecommendedRulesfortheCareandOperationofHeatingBoilersVIIRecommendedGuidelinesfortheCareofPowerBoilersVIIIRulesforConstructionofPressureVesselsDivision1Division2-AlternativeRulesDivision3-AlternativeRulesforConstructionofHighPressureVesselsIXWeldingandBrazingQualificationsXFiber-ReinforcedPlasticPressureVesselsXIRulesforInserviceInspectionofNuclearPowerPlantComponentsXI1RulesforConstructionandContinuedServiceofTransportTanksADDENDAColored-sheetAddenda,whichincludeadditionsandrevisionstoindividualSectionsoftheCode,arepublishedannuallyandwillbesentautomaticallytopurchasersoftheapplicableSectionsuptothepublicationofthe2010Code.The2007Codeisavailableonlyintheloose-leafformat;accordingly,theAddendawillbeissuedintheloose-leaf,replacement-pageformat.INTERPRETATIONSASMEissueswrittenrepliestoinquiriesconcerninginterpretationoftechnicalaspectsoftheCode.TheInter-pretationsforeachindividualSectionwillbepublishedseparatelyandwillbeincludedaspartoftheupdateservicetothatSection.InterpretationsofSection111,Divisions1and2,willbeincludedwiththeupdateservicetoSubsec-tionNCA.InterpretationsoftheCodearedistributedannuallyinJulywiththeissuanceoftheeditionandsubse-quentaddenda.InterpretationspostedinJanuaryat:BoilersandPressureVesselsandNuclearComponents.Supple-mentswillbesentautomaticallytothepurchasersoftheCodeCasesbooksuptothepublicationofthe2010Code.CONTENTSForeword...............................................................................ixStatementsofPolicy...........................................................