BS-EN-13445-3-2009-非燃烧压力容器.设计

EN13445-3:2009(E)Issue1(2009-07)19713.4.2Conditionsofapplicability13.4.2.1TubesheetThetubesheetshallcomplywiththefollowingconditionsofapplicability.a)Thetubesheetshallbeflat,circularandofuniformthickness.b)Alocalreductionofthicknessattheperipheryofthetubesheetforagasketgrooveorareliefgrooveispermitted,providedthattheremaininganalysisthickness,ea,p,isatleastequalto0,8timestheanalysisthickness,ea,ofthetubesheet(seeFigure13.4.2-1):eea,pa≥08,(13.4.2-1)Theradiusshallbenotlessthan5mmandnotlessthan20%oftheadjacentshellthickness.Therequirementfortheremaininganalysisthicknessgivenaboveshallapplyonlyiftheratiooftheoutsidediametertoinsidediameteroftheadjacentshellislargerthan1,2.pa,eaepa,eaepa,eaepa,eaea)Configurationab)Configurationbandepa,eaepa,eaeaepa,eaepa,ec)Configurationdd)ConfigurationcandfFigure13.4.2-1⎯Localreductionofthicknessattubesheetperipheryc)Whenthetubesheetisextendedasaflange,theflangeextensionthicknessshallbecalculatedaccordingto:⎯13.10ifthegasketisnarrow(configurationsb,d2,e);⎯13.11ifthegasketisfullface(configurationsb','2d,e').d)Unlesssatisfactoryexperiencehasbeendemonstratedwiththinnertubesheets,thefollowingconditionsshallbemetwhenthetubesareexpandedintothetubesheet:—whendt≤25mm:BSEN13445-3:2009