DEP 30107332 Design of cathodic protection systems for offshore piplines.docx
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DEP 30107332 Design of cathodic protection systems for offshore piplines.docx
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DEP30107332Designofcathodicprotectionsystemsforoffshorepiplines
DEP30.10.73.32-CSPCOctober2001TECHNICALSPECIFICATION
CNOOCANDSHELLPETROCHEMICALSCOMPLEXPROJECT
DESIGNOFCATHODICPROTECTIONSYSTEMSFOROFFSHOREPIPELINES
(AMENDMENTS/SUPPLEMENTSTODNVRPB401)
DEP30.10.73.32-CSPC
October2001
******ThisDEPhasbeenamendedtobeprojectspecificandisbasedonDEP 30.10.73.32Gen.,datedJuly1996
TheonlytechnicalchangetothisDEPisthatanyreferencestootherDEPshavebeenchangedtosuffix'-CSPC'insteadofsuffix'-Gen.'
RevisionstotheoriginalDEParehighlightedbyunderliningnewtextandstrikingthroughdeletedtext******
DESIGNANDENGINEERINGPRACTICE
Thisdocumentisrestricted.NeitherthewholenoranypartofthisdocumentmaybedisclosedtoanythirdpartywithoutthepriorwrittenconsentofShellGlobalSolutionsInternationalB.V.andShellInternationalExplorationandProductionB.V.,TheNetherlands.Thecopyrightofthisdocumentisvestedinthesecompanies.Allrightsreserved.Neitherthewholenoranypartofthisdocumentmaybereproduced,storedinanyretrievalsystemortransmittedinanyformorbyanymeans(electronic,mechanical,reprographic,recordingorotherwise)withoutthepriorwrittenconsentofthecopyrightowners.
PREFACE
DEPs(DesignandEngineeringPractice)publicationsreflecttheviews,atthetimeofpublication,of:
ShellGlobalSolutionsInternationalB.V.(ShellGSI)
and
ShellInternationalExplorationandProductionB.V.(SIEP)
and
ShellInternationalChemicalsB.V.(SIC)
and
otherServiceCompanies.
Theyarebasedontheexperienceacquiredduringtheirinvolvementwiththedesign,construction,operationandmaintenanceofprocessingunitsandfacilities,andtheyaresupplementedwiththeexperienceofGroupOperatingcompanies.Whereappropriatetheyarebasedon,orreferenceismadeto,international,regional,nationalandindustrystandards.
TheobjectiveistosettherecommendedstandardforgooddesignandengineeringpracticeappliedbyGroupcompaniesoperatinganoilrefinery,gashandlinginstallation,chemicalplant,oilandgasproductionfacility,oranyothersuchfacility,andtherebytoachievemaximumtechnicalandeconomicbenefitfromstandardization.
Theinformationsetforthinthesepublicationsisprovidedtousersfortheirconsiderationanddecisiontoimplement.ThisisofparticularimportancewhereDEPsmaynotcovereveryrequirementordiversityofconditionateachlocality.ThesystemofDEPsisexpectedtobesufficientlyflexibletoallowindividualoperatingcompaniestoadapttheinformationsetforthinDEPstotheirownenvironmentandrequirements.
WhenContractorsorManufacturers/SuppliersuseDEPstheyshallbesolelyresponsibleforthequalityofworkandtheattainmentoftherequireddesignandengineeringstandards.Inparticular,forthoserequirementsnotspecificallycovered,thePrincipalwillexpectthemtofollowthosedesignandengineeringpracticeswhichwillachievethesamelevelofintegrityasreflectedintheDEPs.Ifindoubt,theContractororManufacturer/Suppliershall,withoutdetractingfromhisownresponsibility,consultthePrincipaloritstechnicaladvisor.
TherighttouseDEPsisgrantedbyShellGSI,SIEPorSIC,inmostcasesunderServiceAgreementsprimarilywithcompaniesoftheRoyalDutch/ShellGroupandothercompaniesreceivingtechnicaladviceandservicesfromShell GSI,SIEP,SICoranotherGroupServiceCompany.Consequently,threecategoriesofusersofDEPscanbedistinguished:
1)OperatingcompanieshavingaServiceAgreementwithShellGSI,SIEP,SICorotherServiceCompany.TheuseofDEPsbytheseoperatingcompaniesissubjectinallrespectstothetermsandconditionsoftherelevantServiceAgreement.
2)OtherpartieswhoareauthorizedtouseDEPssubjecttoappropriatecontractualarrangements(whetheraspartofaServiceAgreementorotherwise).
3)Contractors/subcontractorsandManufacturers/Suppliersunderacontractwithusersreferredtounder1)or2)whichrequiresthattendersforprojects,materialssuppliedor-generally-workperformedonbehalfofthesaiduserscomplywiththerelevantstandards.
Subjecttoanyparticulartermsandconditionsasmaybesetforthinspecificagreementswithusers,ShellGSI,SIEPandSICdisclaimanyliabilityofwhatsoevernatureforanydamage(includinginjuryordeath)sufferedbyanycompanyorpersonwhomsoeverasaresultoforinconnectionwiththeuse,applicationorimplementationofanyDEP,combinationofDEPsoranypartthereof,evenifitiswhollyorpartlycausedbynegligenceonthepartofShellGSI,SIEPorotherServiceCompany.ThebenefitofthisdisclaimershallinureinallrespectstoShellGSI,SIEP,SICand/oranycompanyaffiliatedtothesecompaniesthatmayissueDEPsorrequiretheuseofDEPs.
Withoutprejudicetoanyspecifictermsinrespectofconfidentialityunderrelevantcontractualarrangements,DEPsshallnot,withoutthepriorwrittenconsentofShellGSIandSIEP,bedisclosedbyuserstoanycompanyorpersonwhomsoeverandtheDEPsshallbeusedexclusivelyforthepurposeforwhichtheyhavebeenprovidedtotheuser.Theyshallbereturnedafteruse,includinganycopieswhichshallonlybemadebyuserswiththeexpresspriorwrittenconsentofShellGSI,SIEPorSIC.ThecopyrightofDEPsvestsinShellGSIandSIEP.UsersshallarrangeforDEPstobeheldinsafecustodyandShellGSI,SIEPorSICmayatanytimerequireinformationsatisfactorytotheminordertoascertainhowusersimplementthisrequirement.
AlladministrativequeriesshouldbedirectedtotheDEPAdministratorinShellGSI.
TABLEOFCONTENTS
PARTIINTRODUCTION4
PARTIIDESIGNPHILOSOPHY6
PARTIIIAMENDMENTS/SUPPLEMENTSTODNVRP401,1993EDITION7
2.SCOPE8
3.DEFINITIONS,SYMBOLSANDABBREVIATIONS9
5.GENERALDESIGNCONSIDERATIONS10
6.DESIGNPARAMETERS11
7.DESIGNTASK15
8.MANUFACTURINGOFSACRIFICIALANODES18
9.INSTALLATIONOFSACRIFICIALANODES19
10.IMPRESSEDCURRENTCATHODICPROTECTIONSYSTEMS20
11.INSPECTIONANDMONITORINGOFCATHODICPROTECTION23
PARTIVREFERENCES24
APPENDICES
APPENDIX1SPECIMENCOPYOFREQUISITIONSHEET25
APPENDIX2DESIGNEXAMPLES26
APPENDIX3ELECTROCHEMICALTESTPROCEDURESFORSACRIFICIALANODES28
PARTIINTRODUCTION
1.1SCOPE
ThisDEPspecifiesrequirementsandgivesrecommendationsforthedesignofcathodicprotectionsystemsforoffshorepipelines.
ThisDEPmayalsobeappliedtosubmergedpipelinesectionsofon-shorepipelines.
Short"offshore"pipelinesorpipelinesections(e.g.loadinglines)maysometimesbeprotectedbyonshorebased(impressedcurrent)cathodicprotectioninstallations.ForsuchinstallationsreferenceismadetoDEP30.10.73.31-CSPC.
ThisDEPisbasedonDNVRecommendedPracticeRPB401,1993edition.PartIIIofthisDEPgivesamendmentsandsupplementstoRPB401.
1.2DISTRIBUTION,INTENDEDUSEANDREGULATORYCONSIDERATIONS
UnlessotherwiseauthorisedbyShellGSIandSIEP,thedistributionofthisDEPisconfinedtocompaniesformingpartoftheRoyalDutch/ShellGroupormanagedbyaGroupcompany,andtoContractorsandManufacturers/Suppliersnominatedbythem(i.e.thedistributioncodeis"F"asdefinedinDEP 00.00.05.05CSPC).
ThisDEPisintendedforuseontheCSPCproject.
Ifnationaland/orlocalregulationsexistinwhichsomeoftherequirementsmaybemorestringentthaninthisDEPtheContractorshalldeterminebycarefulscrutinywhichoftherequirementsarethemorestringentandwhichcombinationofrequirementswillbeacceptableasregardssafety,environmental,economicandlegalaspects.InallcasestheContractorshallinformthePrincipalofanydeviationfromtherequirementsofthisDEPwhichisconsideredtobenecessaryinordertocomplywithnationaland/orlocalregulations.ThePrincipalmaythennegotiatewiththeAuthoritiesconcernedwiththeobjectofobtainingagreementtofollowthisDEPascloselyaspossible.
1.3DEFINITIONS
1.3.1Generaldefinitions
TheContractoristhepartywhichcarriesoutallorpartofthedesign,engineering,procurement,installation,andcommissioningormanagementofaprojectoroperationormaintenanceofafacility.ThePrincipalmaysometimesundertakeallorpartofthedutiesoftheContractor.
TheManufacturer/SupplieristhepartywhichmanufacturesorsuppliesequipmentandservicestoperformthedutiesspecifiedbytheContractor.
ThePrincipalisthepartywhichinitiatestheprojectandultimatelypaysforitsdesignandconstruction.ThePrincipalwillgenerallyspecifythetechnicalrequirements.ThePrincipalmayalsoincludeanagentorconsultant,authorisedtoactforthePrincipal.
Thewordshallindicatesarequirement.
Thewordshouldindicatesarecommendation.
1.3.2SpecificDefinitions
AnodeManufacturer/Supplier-themanufacturer/supplierofsacrificialanodesandrelatedmaterials
CathodicprotectiondesignContractor-thepartyresponsibleforthedesignofthecathodicprotectionsystemandultimatelyresponsibleforthefunctioningofthecathodicprotectionsystem.
CathodicprotectioninstallationContractor-thepartyresponsiblefortheinstallationofthecathodicprotectionsysteminaccordancewiththedesignandwiththisDEP.
Coatingbreakdownfactor-theratiobetweenthesurfaceareaofexposedmetalduetocoatingbreakdownandthetotalsurfaceareaunderconsideration.Thefactorisusedtodeterminetheaveragecurrentdensityoncoatedmetalfromcurrentdensitiescomparedwiththatforbaresteel.
Conceptualdesign-earlydesignphase,precedingdetaileddesign.
Foreignstructures/pipelines-metalstructures,orpipelinesotherthanthepipelineunderconsideration,
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