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RECOMMENDEDPRACTICEDETNORSKEVERITASDNV-RP-B401CATHODICPROTECTIONDESIGNOCTOBER2010Thisdocumenthasbeenamendedsincethemainrevision(October2010),mostrecentlyinApril2011.See“Changes”onpage3.Theelectronicpdfversionofthisdocumentfoundthrough©DetNorskeVeritasAnycommentsmaybesentbye-mailtorules@dnv.comForsubscriptionordersorinformationaboutsubscriptionterms,pleaseusedistribution@dnv.comComputerTypesetting(AdobeFrameMaker)byDetNorskeVeritasThisservicedocumenthasbeenpreparedbasedonavailableknowledge,technologyand/orinformationatthetimeofissuanceofthisdocument,andisbelievedtoreflectthebestofcontemporarytechnology.TheuseofthisdocumentbyothersthanDNVisattheuser'ssolerisk.DNVdoesnotacceptanyliabilityorresponsibilityforlossordamagesresultingfromanyuseofthisdocument.FOREWORDDETNORSKEVERITAS(DNV)isanautonomousandindependentfoundationwiththeobjectivesofsafeguardinglife,propertyandtheenvironment,atseaandonshore.DNVundertakesclassification,certification,andotherverificationandconsultancyservicesrelatingtoqualityofships,offshoreunitsandinstallations,andonshoreindustriesworldwide,andcarriesoutresearchinrelationtothesefunctions.DNVservicedocumentsconsistofamongstotherthefollowingtypesofdocuments:—ServiceSpecifications.Procedualrequirements.—Standards.Technicalrequirements.—RecommendedPractices.Guidance.TheStandardsandRecommendedPracticesareofferedwithinthefollowingareas:A)Qualification,QualityandSafetyMethodologyB)MaterialsTechnologyC)StructuresD)SystemsE)SpecialFacilitiesF)PipelinesandRisersG)AssetOperationH)MarineOperationsJ)CleanerEnergyO)SubseaSystemsDETNORSKEVERITASAmendedApril2011RecommendedPracticeDNV-RP-B401,October2010seenoteonfrontcoverChanges–Page3CHANGES•GeneralAsofOctober2010allDNVservicedocumentsareprimarilypublishedelectronically.Inordertoensureapracticaltransitionfromthe“print”schemetothe“electronic”scheme,alldocumentshavingincorporatedamendmentsandcorrectionsmorerecentthanthedateofthelatestprintedissue,havebeengiventhedateOctober2010.AnoverviewofDNVservicedocuments,theirupdatestatusandhistorical“amendmentsandcorrections”maybefoundthrough•MainchangesOctober2010Sincethepreviousedition(January2005),thisdocumenthasbeenamended,mostrecentlyinApril2008.Allchangeshavebeenincorporatedandanewdate(October2010)hasbeengivenasexplainedunder“General”.•AmendmentsApril2011—Item6.5.2hasbeenamendedandclarifiedconcerninggalvanicanodeperformancerequirements.—AnewGuidancenotehasbeenaddedtoitem12.4.4(AnnexC).—Thelayouthasbeenchangedtoonecolumninordertoimproveelectronicreadability.DETNORSKEVERITASRecommendedPracticeDNV-RP-B401,October2010AmendedApril2011Page4–ContentsseenoteonfrontcoverCONTENTS1.GENERAL.............................................................................................................................61.1Introduction...........................................................................................................................................61.2Scope......................................................................................................................................................61.3ObjectivesandUse................................................................................................................................71.4DocumentStructure.............................................................................................................................71.5RelationtoOtherDNVDocuments.....................................................................................................72.REFERENCES......................................................................................................................72.1General...................................................................................................................................................72.2ASTM(AmericanSocietyforTestingandMaterials)......................................................................72.3DNV(DetNorskeVeritas)...................................................................................................................72.4EN(EuropeanStandards)....................................................................................................................72.5NORSOK...............................................................................................................................................72.6ISO(InternationalOrganizationforStandardisation).....................................................................72.7NACEInternational.............................................................................................................................83.TERMINOLOGYANDDEFINITIONS.............................................................................83.1Terminology..........................................................................................................................................83.2Definitions...........................................