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OFFSHORESTANDARDDETNORSKEVERITASDNV-OS-F201DYNAMICRISERSOCTOBER2010Theelectronicpdfversionofthisdocumentfoundthrough©DetNorskeVeritasAnycommentsmaybesentbye-mailtorules@dnv.comForsubscriptionordersorinformationaboutsubscriptionterms,pleaseusedistribution@dnv.comComputerTypesetting(AdobeFrameMaker)byDetNorskeVeritasIfanypersonsufferslossordamagewhichisprovedtohavebeencausedbyanynegligentactoromissionofDetNorskeVeritas,thenDetNorskeVeritasshallpaycompensationtosuchpersonforhisproveddirectlossordamage.However,thecompensationshallnotexceedanamountequaltotentimesthefeechargedfortheserviceinquestion,providedthatthemaximumcompen-sationshallneverexceedUSD2million.InthisprovisionDetNorskeVeritasshallmeantheFoundationDetNorskeVeritasaswellasallitssubsidiaries,directors,officers,employees,agentsandanyotheractingonbehalfofDetNorskeVeritas.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)SubseaSystemsDETNORSKEVERITASOffshoreStandardDNV-OS-F201,October2010ACKNOWLEDGEMENTThisOffshoreStandardhasbeendevelopedincloseco-operationwiththeindustry.Thebasisforthestandardwasdevelopedwithintherecentlycompleted4yearJointIndustryProject“DesignProceduresandAcceptanceCriteriaforDeepwaterRisers”.TheJIPwasperformedbyDNV,SINTEFandSeaFlexandsupportedbyinternationaloil-companiesandnationalauthorities.InadditiontothefeedbackfromtheJIPsteeringcommitteetheStandardhasbeencirculatedonextensiveinternalandexternalhearing.Thefollowingorganisationshavemadecontributionstothestandard.DNVisgratefulforthevaluableco-operationsanddiscussionswiththeindividualpersonnelofthesecompanies.CHANGES•GeneralAsofOctober2010allDNVservicedocumentsareprimarilypublishedelectronically.Inordertoensureapracticaltransitionfromthe“print”schemetothe“electronic”scheme,alldocumentshavingincorporatedamendmentsandcorrectionsmorerecentthanthedateofthelatestprintedissue,havebeengiventhedateOctober2010.AnoverviewofDNVservicedocuments,theirupdatestatusandhistorical“amendmentsandcorrections”maybefoundthrough•MainchangesSincethepreviousedition(January2001),thisdocumenthasbeenamended,mostrecentlyinOctober2009.Allchangeshavebeenincorporatedandanewdate(October2010)hasbeengivenasexplainedunder“General”.CoflexipStenaOffshoreNorskHydroStoltOffshoreDSTNPDSINTEFELFPhillipsPetroleumStressEngineeringEuropipeSagaPetroleumShellExxonProd.ResearchCompanySeaFlexStatoilMCSNorwayDETNORSKEVERITASOffshoreStandardDNV-OS-F201,October2010DETNORSKEVERITASCONTENTSSECTION1GENERAL......................................................1A.General............................................................................1A100Introduction..................................................................1A200Objectives.....................................................................1A300ScopeandApplication...............................................1A400OtherCodes.................................................................2A500StructureofStandard..................................................2B.NormativeReferences.................................................3B100OffshoreServiceSpecifications...............................3B200OffshoreStandards.....................................................3B300RecommendedPractices............................................3B400Rules...........................................................................3B500CertificationnotesandClassificationnotes...........3B600Guidelines.....................................................................3B700Otherreferences..........................................................3C.Definitions.......................................................................6C100Verbalforms.................................................................6C200Definitions....................................................................6D.AbbreviationsandSymbols.......................................9D100Abbreviations..............................................................9D200Symbols......................................................................10D300GreekCharacters.......................................................11SECTION2DESIGNPHILOSOPHYANDDESIGNPRINCIPLES........................................