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CrosbyValveInc.Crosby®PressureReliefValveEngineeringHandbookTechnicalDocumentNo.TP-V300Effective:May1997AnFMCCorporationsubsidiaryNotes:CROSBY®PressureReliefValveENGINEERINGHANDBOOKCONTENTSChapter1IntroductiontoCrosbyEngineeringHandbookChapter2FundamentalsofPressureReliefValveDesignChapter3TerminologyChapter4CodesandStandards-SummaryChapter5ValveSizingandSelection-U.S.C.S.*UnitsChapter6ValveSizingandSelection-MetricUnitsChapter7EngineeringSupportInformationAppendixASMESectionVIII,Division1,1992EditionExerptsOtherInformationOrderingInformationPressureReliefValveSpecificationSheetWarning:Theinformationcontainedinthishandbookisforinformationalpurposesonly.SeealsoCrosby'scomputersizingprogram,CROSBY-SIZE.TheactualselectionofvalvesandvalveproductsisdependentuponnumerousfactorsandshouldbemadeonlyafterconsultationwithapplicableCrosbypersonnel.CrosbyassumesnoresponsibilityfortheactualselectionofsuchproductsandherebyexpresslydisclaimsliabilityforanyandallclaimsanddamageswhichmayresultfromtheuseorapplicationofthisinformationorfromanyconsultationwithCrosbypersonnel.*UnitedStatesCustomarySystemCrosby®EngineeringHandbookTechnicalPublicationNo.TP-V300ChapterIIntroductionTheCrosby®PressureReliefValveEngineeringHand-bookcontainsimportanttechnicalinformationrelatingtopressurereliefvalves.Theprimarypurposeofapressurereliefvalveisprotec-tionoflifeandpropertybyventingfluidfromanoverpressurizedvessel.Informationcontainedinthishandbookappliestotheoverpressureprotectionofpressurevessels,linesandsystems.ReferenceismadetotheASMEBoilerandPressureVesselCode,SectionVIII,PressureVessels.TheinformationinthishandbookisNOTtobeusedfortheapplicationofoverpressureprotectiontopowerboilersandnuclearpowerplantcomponentswhichareaddressedintheASMEBoilerandPressureVesselCode,SectionI,PowerBoilers,andSectionIII,NuclearPowerPlantComponents,respectively.Propersizing,selection,manufacture,assembly,test,installationandmaintenanceofapressurereliefvalveareallcriticaltoobtainingmaximumprotection.ThishandbookhasbeendesignedtoprovideaservicetoCrosby’scustomersbypresentingreferencedataandtechnicalrecommendationsbasedonourmanyyearsofexperienceinsizing,selecting,testing,installingandoperatingpressurereliefvalves.SufficientdataissuppliedsotoproperlysizeandselectCrosbypressurereliefvalvesforspecificapplications.Informationcov-eringterminology,standards,codes,basicdesign,siz-ingandselectioninformation,includingexamples,arepresentedinaneasytouseformat.SomeofthematerialinthishandbookisreprintedorexcerptedfrompublicationsdevelopedbyassociationsorcommitteesinwhichCrosbyhasparticipated.Theinformationcontainedinthemanualisofferedasaguide.Thosewhousetheinformationareremindedofthelimitationsofsuchapublicationandthatthereisnosubstituteforqualifiedengineeringanalysis.Crosbypressurereliefvalvesaremanufacturedinac-cordancewithacontrolledQualityAssuranceProgramwhichmeetsorexceedsASMECodeQualityControlProgramrequirements.CapacitiesarecertifiedbytheNationalBoardofBoilerandPressureVesselInspec-tors.ThesefeaturesareassuredbythepresenceofanASMECodeSymbolStampandthelettersNBoneachvalvenameplate.Crosby'svalvesaredesigned,manu-facturedandtestedinaccordancewithaqualityman-agementsystemapprovedtotheInternationalStan-dardOrganization'sISO9000QualityStandardSeriesrequirements.Withpropersizingandselection,theusercanthusbeassuredthatCrosbyproductsareofthehighestqualityandtechnicalstandardsintheworldofpressurerelieftechnology.Whenindoubtastotheproperapplicationofanyparticulardata,theuserisadvisedtocontactthenear-estCrosbyRegionalOfficeorRepresentative.Crosbyhasalargestaffofhighlytrainedpeoplestrategicallylocatedthroughouttheworldwhoshouldbecontactedwhenaquestionarises.RefertoCrosby'sWorldwideDirectoryforanup-to-datecontactlisting.Crosby'sComputerAidedValveSizingProgram-CROSBY-SIZECrosbyhasdesignedacomputersizingprogram,CROSBY-SIZE,toprovidemaximumservicetoourcus-tomersbypresentingrecommendationsbasedonCrosby'smanyyearsofexperience.Useofthisprogramallowsanaccuratedeterminationofsuchparametersasorificesize,maximumflowandpredictedsoundlevel.Theprogramisapowerfultool,yeteasytouse.Itsmanyfeaturesincludequickandaccuratecalculations,userselectedunits,selectionofvalvesizeandstyle,valvedatastorage,printedreports,specificationsheetsanddimensionaldrawings.1-1Chapter1IntroductionCrosbyEngineeringHandbookProgramcontrolviapop-upwindows,functionkeys,extensiveon-linehelpfacilities,easytoreadformattedscreens,immediateflaggingoferrors,easyeditingofdisplayedinputsandotherfeaturescombinetomaketheprogrameasytounderstandandoperate.ItisassumedthattheuserofCROSBY-SIZEhasabasicunderstandingofreliefvalvesizingcalculations.Theuserisresponsibleforcorrectdeterminationofserviceconditionsandthesuitabilityofthisprogramforaspecificapplication.CROSBY-SIZEandCrosby'sEngineeringHandbookareusefultoolsinsizingpressurereliefvalves.Shouldadditionalclarificationberequired,contactCrosby.1-2Crosby®EngineeringHandbookTechnicalPublicationNo.TP-V300Chapter2DesignFundamentalsIntroductionApressurereliefvalveisasafetydevicedesignedtoprote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