BS 7777-4-1993 低温用平底、立式、圆柱形储罐.储存液态氧、液态氮和液态氩的单层密封罐的

BRITISHSTANDARDBS7777-4:1993Flat-bottomed,vertical,cylindricalstoragetanksforlowtemperatureservice—Part4:Specificationforthedesignandconstructionofsinglecontainmenttanksforthestorageofliquidoxygen,liquidnitrogenorliquidargonLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,MonSep0410:11:56BST2006,UncontrolledCopy,(c)BSI©BSI03-1999ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePVE/15Draftforcomment90/73037DCISBN0580216853CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbythePressureVesselStandardsPolicyCommittee(PVE/-)toTechnicalCommitteePVE/15,uponwhichthefollowingbodieswererepresented:BritishChemicalEngineeringContractors’AssociationBritishCompressedGasesAssociationBritishGasplcConcreteSocietyEnergyIndustriesCouncilEngineeringEquipmentandMaterialsUsers’AssociationInstitutionofGasEngineersInstitutionofMechanicalEngineersProcessPlantAssociationThermalInsulationsContractors’AssociationWeldingInstituteAmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,MonSep0410:11:56BST2006,UncontrolledCopy,(c)BSI©BSI03-1999iContentsPageCommitteesresponsibleInsidefrontcoverForewordii1Scope12References13Definitions14Designconditions15Informationtobeexchangedbetweenthepurchaserandthecontractor25.1Informationtobesuppliedbythepurchaser25.2Informationandrequirementstobeagreedandtobedocumented26Innertank36.1Materials36.2Plateandfittings36.3Shellplatethickness36.4Weldmetal36.5Boltingmaterials36.6Mountings36.7Loadings46.8Tankdesign46.9Nozzleandaccessopeningdesign46.10Permanentattachmentsotherthanmanholesandnozzles56.11Temporaryattachments56.12Interconnectingmountings(pipework)56.13Tankanchorage57Outercontainer57.1Materials57.2Loadings67.3Design67.4Mountings77.5Stairways,gangways,platformsandladders77.6Anchorage78Shopfabrication79Siteerection710Non-destructivetesting710.1Radiography710.2Crackdetection710.3Leaktesting711Testing711.1General711.2Hydrostatictesting711.3Pneumatictesting811.4Testprocedures812Cleanliness813Insulation814Foundation815Internalpositiveandinternalnegativepressurerelief916Commissioninganddecommissioning917Nameplate9LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,MonSep0410:11:56BST2006,UncontrolledCopy,(c)BSI©BSI03-1999PageFigure1—Detailoflapweldedinnerroof8Table1—Maximumshellplatethickness3Table2—Nominalshellthickness4ListofreferencesInsidebackcoverLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,MonSep0410:11:56BST2006,UncontrolledCopy,(c)BSI©BSI03-1999iiiForewordThisPartofBS7777hasbeenpreparedunderthedirectionofthePressureVesselsStandardsPolicyCommittee.Flat-bottomed,vertical,cylindricalstoragetanksforliquidoxygen,liquidnitrogenorliquidargonhavetraditionallybeenofthedoublewall,singlecontainmenttypewheretheliquidiscontainedinaninnertank,andanoutercontainerservesmainlytocontaintheinsulation.ThesetankswerebuiltinaccordancewiththefollowingBritishStandard:BS5387:1976,Specificationforverticalcylindricalweldedstoragetanksforlow-temperatureservice:double-walltanksfortemperaturesdownto–196°C.Itisstillthepracticetostoreliquidoxygen,liquidnitrogenorliquidargoninsinglecontainmenttanks.Thisisduetothecombinationofstoredfluidproperties,tanksizeandpropertiesofthematerialsofconstruction.IthasbeendecidedtoreviseBS5387andrationalizeitwithinBS7777.ThisPartofBS7777,togetherwithBS7777-1toBS7777-3,supersedesBS5387:1976whichiswithdrawn.ThisPartcoversonlysinglecontainment,flat-bottomed,cylindrical,stand-alonestoragetanks,butisnotintendedtoexcludetheuseofotherstorageconceptsanddesignswhichhavebeenproveninservice.ThisBritishStandardcomprisesfourParts:—Part1:Guidetothegeneralprovisionsapplyingfordesign,construction,installationandoperation;—Part2:Specificationforthedesignandconstructionofsingle,doubleandfullcontainmentmetaltanksforthestorageofliquefiedgasattemperaturesdownto–165°C;—Part3:Recommendationsforthedesignandconstructionofprestressedandreinforcedconcretetanksandtankfoundations,andforthedesignandinstallationoftankinsulation,tanklinersandtankcoatings;—Part4:Specificationforthedesignandconstructionofsinglecontainmenttanksforthestorageofliquidoxygen,liquidnitrogenorliquidargon.NOTEThisstandardhasbeenwrittedintheformofapracticespecification(seeclause6ofPD6501-1:1982).Tocomplywiththisspecification,theuserhastocomplywithallofitsrequirements.Theusermayresponsiblydepartfromtherecommendations,butwouldbeexpectedtohavegoodreasonsfordoingso.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcompri