DNV标准-Cn7-2008[1]

CLASSIFICATIONNOTESNo.7DETNORSKEVERITASVeritasveien1,NO-1322Høvik,NorwayTel.:[phone]Fax:[phone]NON-DESTRUCTIVETESTINGDECEMBER2004FOREWORDDETNORSKEVERITAS(DNV)isanautonomousandindependentfoundationwiththeobjectivesofsafeguardinglife,prop-ertyandtheenvironment,atseaandonshore.DNVundertakesclassification,certification,andotherverificationandconsultancyservicesrelatingtoqualityofships,offshoreunitsandinstallations,andonshoreindustriesworldwide,andcarriesoutresearchinrelationtothesefunctions.ClassificationNotesClassificationNotesarepublicationsthatgivepracticalinformationonclassificationofshipsandotherobjects.Examplesofde-signsolutions,calculationmethods,specificationsoftestprocedures,aswellasacceptablerepairmethodsforsomecomponentsaregivenasinterpretationsofthemoregeneralrulerequirements.AlistofClassificationNotesisfoundinthelatesteditionofPt.0Ch.1ofthe”RulesforClassificationofShips”andthe”RulesforClassificationofHighSpeed,LightCraftandNavalSurfaceCraft”.ThelistofClassificationNotesisalsoincludedinthecurrent“ClassificationServices–Publications”issuedbytheSociety,whichisavailableonrequest.AllpublicationsmaybeorderedfromtheSociety’[e-mail]orinformationaboutsubscriptionterms,[e-mail]ionaboutDNVandtheSociety'sservicesisfoundattheWebsite©DetNorskeVeritasComputerTypesetting(FM+SGML)byDetNorskeVeritasPrintedinNorway.IfanypersonsufferslossordamagewhichisprovedtohavebeencausedbyanynegligentactoromissionofDetNorskeVeritas,thenDetNorskeVeritasshallpaycompensationtosuchpersonforhisproveddirectlossordamage.However,thecompensationshallnotexceedanamountequaltotentimesthefeechargedfortheserviceinquestion,providedthatthemaximumcompen-sationshallneverexceedUSD2million.InthisprovisionDetNorskeVeritasshallmeantheFoundationDetNorskeVeritasaswellasallitssubsidiaries,directors,officers,employees,agentsandanyotheractingonbehalfofDetNorskeVeritas.MainchangesClassificationNoteNo.7hasbeencompletelyrevisedandcoversthesixmostfrequentlyusedNDTmethods;i.e.—Eddycurrenttesting(ET),—Magneticparticletesting(MT),—Penetranttesting(PT),—Radiographictesting(RT),—Ultrasonictesting(UT),andfinallytheveryimportant—Visualtesting(VT).Errata2008-11-05Items6.6.7and6.9havebeenclarified.DETNORSKEVERITASClassificationNotes-No.73December2004CONTENTS1.INTRODUCTION....................................................41.1Preamble......................................................................41.2Normativereference....................................................41.3Definitionsandsymbols..............................................51.4Safety...........................................................................51.5Personnelqualifications...............................................51.6Informationrequiredpriortotesting..........................61.7Extentoftesting...........................................................61.8Materials......................................................................61.9Selectionoftestingmethod.........................................61.10Timeoftesting.............................................................61.11Finalreport...................................................................62.EDDYCURRENT....................................................72.1Scope............................................................................72.2Definitions...................................................................72.3Personnelqualifications...............................................72.4Informationrequired(priortotesting)........................72.5Surfaceconditions......................................................72.6Equipment....................................................................72.7Testing.........................................................................82.8AcceptanceCriteria.....................................................92.9Evaluationofnonacceptableindication......................92.10Reporting.....................................................................93.MAGNETICPARTICLETESTING...................133.1Scope..........................................................................133.2Definitionsandsymbols............................................133.3Informationrequired(priortotesting).......................133.4Personnelqualifications.............................................133.5Magnetizing...............................................................133.6Overallperformancetest............................................133.7Preparationofsurfaces..............................................133.8Testing.......................................................................133.9Evaluationofimperfections.......................................183.10Acceptancecriteria....................................................183.11Demagnetization........................................................183.12Reporting