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1、Pressure-relievingandDepressuringSystemsANSI/APISTANDARD521FIFTHEDITION,JANUARY2007ISO23251(Identical),Petroleumandnaturalgasindustries—Pressure-relievinganddepressuringsystems--`,`,`,```,,```,`,`,`,```,`,`,-`-`,,`,,`,`,,`---CopyrightAmericanPetroleumInstituteProvidedb
2、yIHSunderlicensewithAPILicensee=techints.a/5938621100,User=CEIN,CEINNoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResale,02/02/200708:44:05MST--`,`,`,```,,```,`,`,`,```,`,`,-`-`,,`,,`,`,,`---CopyrightAmericanPetroleumInstituteProvidedbyIHSunderlicensewi
3、thAPILicensee=techints.a/5938621100,User=CEIN,CEINNoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResale,02/02/200708:44:05MSTSpecialNotesAPIpublicationsnecessarilyaddressproblemsofageneralnature.Withrespecttoparticularcircumstances,local,state,andfederal
4、lawsandregulationsshouldbereviewed.NeitherAPInoranyofAPI’semployees,subcontractors,consultants,committees,orotherassigneesmakeanywarrantyorrepresentation,eitherexpressorimplied,withrespecttotheaccuracy,completeness,orusefulnessoftheinformationcontainedherein,orassumean
5、yliabilityorresponsibilityforanyuse,ortheresultsofsuchuse,ofanyinformationorprocessdisclosedinthispublication.NeitherAPInoranyofAPI’semployees,subcontractors,consultants,orotherassigneesrepresentthatuseofthispublicationwouldnotinfringeuponprivatelyownedrights.APIpublic
6、ationsmaybeusedbyanyonedesiringtodoso.EveryefforthasbeenmadebytheInstitutetoassuretheaccuracyandreliabilityofthedatacontainedinthem;however,theInstitutemakesnorepresentation,warranty,orguaranteeinconnectionwiththispublicationandherebyexpresslydisclaimsanyliabilityorres
7、ponsibilityforlossordamageresultingfromitsuseorfortheviolationofanyauthoritieshavingjurisdictionwithwhichthispublicationmayconflict.APIpublicationsarepublishedtofacilitatethebroadavailabilityofproven,soundengineeringandoperatingpractices.Thesepublicationsarenotintended
8、toobviatetheneedforapplyingsoundengineeringjudgmentregardingwhenandwherethesepublicationsshouldbeutilized.Theformulat
