BSEN1295232001水管锅炉和辅助设备压力零件的设计和计算

BRITISHSTANDARDBSEN12952-3:2001Water-tubeboilersandauxiliaryinstallations—Part3:DesignandcalculationofpressurepartsTheEuropeanStandardEN12952-3:2001hasthestatusofaBritishStandardICS27.040NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,ThuAug2310:13:28GMT+00:002007,UncontrolledCopy,(c)BSIBSEN12952-3:2001ThisBritishStandard,havingbeenpreparedunderthedirectionoftheEngineeringSectorPolicyandStrategyCommittee,waspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon28May2002©BSI28May2002ISBN0580383547NationalforewordThisBritishStandardistheofficialEnglishlanguageversionofEN12952-3:2001.ItpartiallysupersedesBS1113:1999whichwillbewithdrawnwhenParts1,2,3,5,6,7,10and11ofBSEN12952areallpublished.WhenreferencetothispartoftheEuropeanStandardhasbeenpublishedintheOfficialJournaloftheEuropeanCommunities(OJ),compliancewithitwillconferapresumptionofconformitywiththeessentialsafetyrequirementsofthePressureEquipmentDirectivecoveredbythispartofthestandard.TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteePVE/2,Water-tubeboilers,whichhastheresponsibilityto:Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitssecretary.AdditionalinformationTheUnitedKingdomvotedagainsttheacceptanceofthisEuropeanStandardattheFormalVotestage.TheprincipalUKobjectionswereasfollows:a)ThereisnoreferenceintheENforewordtoCR12952-17,Water-tubeboilersandauxiliaryinstallations—Part17:Guidelinesfortheinvolvementofaninspectionbodyindependentofthemanufacturer.b)CEN/TC269passedaresolutionthatParts1,2,3,5,6and7bepublishedasapackagenecessaryforthedesign,constructionandsafetyofwater-tubeboilersbutnomentionofthisisgivenintheENforeword.c)5.5coverscyclicloadingandgivesarequirementthatinequation(5.5-1)
m=4or,ifthereisanydoubtthatthevalueisconservative,theexactvalueof
mshallbetakenfromFigure13.4-5orFigure13.4-7.However,thereisnoreferenceto
minFigure13.4-7.d)5.6.1coversdesignrequirements.Thelastparagraphofthissubclausegivesarequirementthatformajorcomponentsoperatinginthecreeprange,facilitiesshallbeprovidedformonitoringthecreepinrelationtooperation.However,thereisnospecificinstructionaboutwhatconstitutesa“majorcomponent”,forexamplenolimitingdiameterisspecified.e)5.8.1coversinternalmetalwastageandgivesarequirementthatthemagnetitelayershallbeprotectedinaccordancewith13.4.1.1,however,nosuchsubclauseexistswithinthispartofEN12952:2001.f)5.8.2coversexternalmetalwastageandgivesarequirementthatinthespecialcaseofchemicalrecoveryboilers,itshallbepermittedtoprovideforwastagebymeansofmetallurgicallybonded,compositematerialtubingwithcorrosionresistantlayers.Thisimpliesthatthistechniqueisonlysuitableforchemicalrecoveryboilers,wheninfactitisalsosuitableforothertypesofboilers.—aidenquirerstounderstandthetext;—presenttotheresponsibleinternational/Europeancommitteeanyenquiriesontheinterpretation,orproposalsforchange,andkeeptheUKinterestsinformed;—monitorrelatedinternationalandEuropeandevelopmentsandpromulgatethemintheUK.AmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,ThuAug2310:13:28GMT+00:002007,UncontrolledCopy,(c)BSIBSEN12952-3:2001©BSI28May2002ig)Table6.3-1andTable6.3.2givematerialstrengthvaluesKandrelatedsafetyfactorsSforuseindeterminingdesignstress.FootnoteaineachtablestatesthatifcreeprupturestrengthvaluesRmTtcfortimesinexcessof100000harenotavailable,100000hdatamaybeusedwithS=1.5.ThisisinconsistentwiththedifferentvaluesofSusedinthetwotables.h)Equation(7.3.-10)of7.3.4isusedintheevaluationofligamentstressforinclinedligamentsindrums,however,thetermPb0ofthisequationisnotdefined.i)7.5coverstressincylindricalshells.Thefirstparagraphofthissubclausegivesarequirementthat,inadditiontotherequirementsof7.3and8.1.1,otherlocalstressesshallalsobeconsidered.However,thereisnospecificinstructionaboutwhatotherlocalstressesaretobeconsidered.j)8.1.1.1givesalistofrequirementsfortheligamentefficiencyofthemainbodyofcylindricalshellswithopeningsandbranches.Itemd)oftheliststatesthatreinforcingpadsanalogoustoitema)shallbeused.Itthenstatesthattherequirementsofclause13arenotapplicabletothistypeofreinforcement.Thisimpliesthatreinforcingpadsaregoodinfatiguesituationanddonotneedchecking.Itisfeltthattheoppositeistrue,inwhichcasethereneedstobearequirementthatprecludestheuseofreinforcingpadsinlocationssubjecttofatigue.k)Figure8.1-1showsreinforcementbyincreasedwallthicknessofacylindricalshellmainbodywithopening.However,thearrowfortheeffectivewidthofthereinforcingline
disisincorrectlypointingtotheoutsidediameterinsteadoftheboreofthebody.l)Figure8.1-2showsreinforcementbyset-throughandfullpenetrationweldedbranchbuttheeffectivelengthofinnerprojectionofset-throughbranchisincorrectlylabelledaslrb1insteadoflrbi.m)Figure8.1-8showsanopeningwithreinforcingpadandfullpenetrationset-throughandsetonweldedbranch.However,therearenodimensionsfortheeffectivelengthofthereinforcingpadlrp.n)8.1.2coverseffectivelengthsforthecalculationofefficiencie