API RP 2MIM 1ST ED (R 2025) Mooring Integrity Management; First Edition; Reaffirmed, June 2025.docx

1、MooringIntegrityManagementAPIRECOMMENDEDPRACTICE2MIMFIRSTEDITION,SEPTEMBER2019REAFFIRMED,JUNE2025SpecialNotesAPIpublicationsnecessarilyaddressproblemsofageneralnature.Withrespecttoparticularcircumstances,local,state,andfederallawsandregulationsshouldbereviewed.NeitherAPInoranyofAPsemployees,subcontr

2、actors,consultants,committees,orotherassigneesmakeanywarrantyorrepresentation,eitherexpressorimplied,withrespecttotheaccuracy,completeness,orusefulnessoftheinformationcontainedherein,orassumeanyliabilityorresponsibilityforanyuse,ortheresultsofsuchuse,ofanyinformationorprocessdisclosedinthispublicati

3、on.NeitherAPInoranyofAPsemployees,subcontractors,consultants,orotherassigneesrepresentthatuseofthispublicationwouldnotinfringeuponprivatelyownedrights.APIpublicationsmaybeusedbyanyonedesiringtodoso.EveryefforthasbeenmadebytheInstitutetoensuretheaccuracyandreliabilityofthedatacontainedinthem;however,

4、theInstitutemakesnorepresentation,warranty,orguaranteeinconnectionwiththispublicationandherebyexpresslydisclaimsanyliabilityorresponsibilityforlossordamageresultingfromitsuseorfortheviolationofanyauthoritieshavingjurisdictionwithwhichthispublicationmayconflict.APIpublicationsarepublishedtofacilitate

5、thebroadavailabilityofproven,soundengineeringandoperatingpractices.Thesepublicationsarenotintendedtoobviatetheneedforapplyingsoundengineeringjudgmentregardingwhenandwherethesepublicationsshouldbeutilized.TheformulationandpublicationofAPIpublicationsisnotintendedinanywaytoinhibitanyonefromusinganyoth

6、erpractices.Usersofthisrecommendedpracticeshouldnotrelyexclusivelyontheinformationcontainedinthisdocument.Soundbusiness,scientific,engineering,andsafetyjudgmentshouldbeusedinemployingtheinformationcontainedherein.Allrightsreserved.Nopartofthisworkmaybereproduced,translated,storedinaretrievalsystem,o

7、rtransmittedbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutpriorwrittenpermissionfromthepublisher.ContactthePubIisher5APIPublishingServices,200MassachusettsAvenue,NW,Washington,DC20001.Copyright2019AmericanPetroleumInstituteForewordNothingcontainedinanyAPIpublicationistob

8、econstruedasgrantinganyright,byimplicationorotherwise,forthemanufacture,sale,oruseofanymethod,apparatus,orproductcoveredbyletterspatent.Neithershouldanythingcontainedinthepublicationbeconstruedasinsuringanyoneagainstliabilityforinfringementofletterspatent.Theverbalformsusedtoexpresstheprovisionsinth

9、isdocumentareasfollows.Shall:Asusedinastandard,ushal,denotesaminimumrequirementinordertoconformtothestandard.Should:Asusedinastandard,t,should,denotesarecommendationorthatwhichisadvisedbutnotrequiredinordertoconformtothestandard.May:Asusedinastandard,umaydenotesacourseofactionpermissiblewithinthelim

10、itsofastandard.Can:Asusedinastandard,candenotesastatementofpossibilityorcapability.ThisdocumentwasproducedunderAPIstandardizationproceduresthatensureappropriatenotificationandparticipationinthedevelopmentalprocessandisdesignatedasanAPIstandard.Questionsconcerningtheinterpretationofthecontentofthispu

11、blicationorcommentsandquestionsconcerningtheproceduresunderwhichthispublicationwasdevelopedshouldbedirectedinwritingtotheDirectorofStandards3AmericanPetroleumInstitute,200MassachusettsAvenue,NW3Washington,DC20001.Requestsforpermissiontoreproduceortranslatealloranypartofthematerialpublishedhereinshou

12、ldalsobeaddressedtothedirector.Generally,APIstandardsarereviewedandrevised,reaffirmed,orwithdrawnatleasteveryfiveyears.Aone-timeextensionofuptotwoyearsmaybeaddedtothisreviewcycle.StatusofthepublicationcanbeascertainedfromtheAPIStandardsDepartment,telephone(202)682-8000.AcatalogofAPIpublicationsandma

13、terialsispublishedannuallybyAPI,200MassachusettsAvenue3NW3Washington,DC20001.SuggestedrevisionsareinvitedandshouldbesubmittedtotheStandardsDepartment,API5200MassachusettsAvenue3NW3Washington,DC20001,standardsapi.org.Contents1 Scope12 NormativeReferences13 Terms,Definitions,andAbbreviations13.1 Terms

14、andDefinitions13.2 Abbreviations54 MooringIntegrityManagementProcess64.1 General64.2 MooringIntegrityManagementOverview64.3 Data84.4 Evaluation94.5 Strategy134.6 Process155 InspectionandMonitoring175.1 General175.2 Inspections175.3 Monitoring206 AssessmentProcess216.1 General216.2 SimplifiedAssessme

15、nt216.3 DesignAssessment237 AssessmentMethods247.1 General247.2 AssessmentInitiators257.3 AssessmentInformation257.4 ImplementationFeasibility277.5 RiskAssessment277.6 PerformanceCriteria278 RiskReduction28Annex A (informative)CommentaryAdditionalInformationandGuidance29Annex B (informative)MooringI

16、ntegrityManagementSystemObjectives35Annex C (informative)CausesofFailure37Annex D (informative)IncidentResponsePlanning47Annex E (informative)InspectionMethodsandObjectives55Bibliography72FiguresPhysicalInterfacesbetweenAPIIMStandardsvii1 IMProcessMap72 StepsintheIMProcess83 RiskCategorizationMatrix

17、Example114 MooringDamageAssessmentProcess22JJ2.3/J2.34.5ACCCCE.E.E.E.E.ExampleSystemBlockDiagram(SBD)foranRTMMooringSystemRateofFailureperLineperExposedYearFailureCausesChainandWireRopeFailureLocationbyComponentTypeIntroductionofCausesofFailureVesselNavigationaroundMooringLineExampleInspectionWorkPa

18、ck(Sheet1of3)ExampleInspectionWorkPack(Sheet2of3)ExampleInspectionWorkPack(Sheet3of3)ExampleInspectionChecklist.30.37.37.38.39.63.65.66.6768TablesB.1MooringIMObjectivesbyProjectPhaseC.1MaterialandConfiguration-basedVulnerabilitiesC.2Event-basedCausesofFailureC.3IndicationsofDegradationCausesE.1Inspe

19、ctionMethodsE.2InspectionMethodRequirements354142435659IntroductionThisrecommendedpractice(RP)isoneofthreeadditionstoAPsportfolioofoffshorefloatingstructuresstandardsthataddressintegritymanagement(IM)offloatingsystems(API2FSIM),mooringsystems(API2MIM),andrisersystems(API2RIM).ThisRPisintendedtobeuse

20、dbyownersandengineersinthedevelopment,implementation,anddeliveryofaprocesstomaintainsystemintegrityoffloatingproductionsystems(FPSs)5notincludingtensionlegplatforms(TLPs).Thespecifications,procedures,andguidanceprovidedhereinarebasedoninternationallyrecognizedindustrystandardsandonglobalindustrybest

21、practices.APsexistingsuiteofrecommendedpracticessuchasAPI2FPS,API2T,API2SK,API2RD,andAPI2SIMaddressseveralaspectsoflifecycleintegritymanagementexpectations,andthethreenewstandardsaddtothatsuitebycapturingexperiencesfromowners,operators,integritymanagementspecialists,recognizedclassificationsocieties

22、RCSs)3andregulators,establishingacommonframeworkforIMforFPSs.ThefigurebelowdepictstheinterfacesbetweenthehullandmooringandrisersforvarioustypesofFPSsandtheIMstandardthataddressesthespecificsystems.TensionLegPlatformSparFPSOPhysicalInterfacesbetweenAPIIMStandardsImplementationofeffectiveintegrityman

23、agementforfloatingsystemsrequiresanunderstandingoftheinterfacesbetweenthehull,mooring,andrisersandhowtheytranslatetostewardshipofIMactivitiesinthefield.Thenewstandardshavebeendevelopedwiththeobjectiveofrecognizingandidentifyingkeyinterfaces,andtheyemphasizethecriticalityofasystemslevelapproach.Byhav

24、ingaconsistentsystemslevelapproachandbypursuingarisk-basedframeworktodevelop,evaluate,plan,andimplementanintegritymanagementprogramforafloatingsystem,theusercantailortheIMprogramaroundtheuniquedesigndrivers,in-serviceandoperatingconditionswhileconformingtotheownersorganizationalsafety,healthandenvir

25、onmentriskmanagementpoliciesandregulatoryrequirements.MooringIntegrityManagement1 ScopeThisrecommendedpractice(RP)providesguidancefortheintegritymanagement(IM)ofmooringsystemsconnectedtoapermanentfloatingproductionsystem(FPS)usedforthedrilling,development,production,and/orstorageofhydrocarbonsinoffs

26、horeareas.ThescopeofthisRPextendsfromtheanchortotheconnectiontothefloatingunit(e.g.chainstopper)andincludescomponentscriticaltothemooringsystem(e.g.turretbearings,fairleads,chainstoppers,anchors,suctionpiles).Specificguidanceisprovidedfortheinspection,monitoring,evaluationofdamage,fitness-for-servic

27、eassessment,riskreduction,mitigationplanning,andtheprocessofdecommissioning.ThisRPincorporatesandexpandsontheIMrecommendationsfoundinAPI2landAPI2SK.IntheeventofanydiscrepancybetweenAPI2MIMandAPI2IAPI2SK,AP2IAPI2SKwillgovern.ThisRPisnotintendedfor: structuralsteelworkofturretsystemsandTLPtendons,whic

28、hareaddressedbyAPI2FSIM; thrusters,powergeneration,orcontrolsystem; mobileoffshoredrillingunit(MODU)orothertemporarymooringsthataredeployedandretrievedfrequently; vesselsholdingstationviaadynamicpositioning(DP)system,withouttheuseofmooring.2 NormativeReferencesThefollowingdocumentsarereferredtointhe

29、textinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyaddenda)applies.APIRecommendedPractice2l,In-serviceInspectionofMooringHardwareforFloatingStructuresAPI

30、RecommendedPractice2SM,Design,Manufacture,Installation,andMaintenanceofSyntheticFiberROPeforOffshoreMooring3 Terms5Definitions,andAbbreviationsForthepurposesofthisdocument,thefollowingtermsanddefinitionsapply.3.1 TermsandDefinitions3.1.1anomalyAnobservationorfindingindicatingthepossibilitythatacerta

31、inparametercouldbeoutsideanacceptabledesignorperformancethreshold.3.1.2assessmentAtechnicalreviewprocesstriggeredbyanassessmentinitiator(asidentifiedduringanevaluation)todemonstratethatasystemorstructureisfit-for-serviceortodeterminetheneedforriskreduction.3.1.3assessmentinitiatorChangesinmooringcon

32、ditionoroperatingexperience,suchasstorms,whichrequireanexistingmooringtoundergoanassessmenttodemonstratefitness-for-service.3.1.4baselineinspectionEstablishestheconditionandstatusofamooringsystematthetimeitisinstalledorcommissioned,orthecurrentconditioniftheinspectionhadnotbeendonewhenitwasinstalled

33、3.1.5conditionassessmentTheprocessofgatheringinformationonamooringsystem,spresentconditiontoperformafitness-for-serviceassessment.3.1.6continuedserviceThecontinuedin-situoperationOfamooringsystembeyonditsoriginalservicelifeorapprovedregulatoryoperatinglife.NOTESometimesreferredtoaslifeextension.3.1

34、7defectAnimperfectionorflawinacomponentofanexistingmooringsystem.NOTEAsusedinthisRP,thetermdefectdoesnotnecessarilydenotethatthemooringsystemisnotfit-for-service.3.1.8designlifeThetimeperiodassumedfordefiningvariousdesignparameterssuchascorrosionallowanceandfatiguelife.3.1.9disconnectablefloatingst

35、ructureAfloatingstructurecapableofdiscontinuingproductionandrapidlyseparatingfromitsancillarycomponents,suchasrisers,moorings,andwellsystemsinresponsetotheoccurrenceofathresholdevent.3.1.10emergencyresponseAresponsetounexpectedfailureincludinglossofoneormoremooringlines,incidentsarisingfromknowndegr

36、aded/degradingmooringcomponents,ormechanicalpartsfailurecausingfunctionalityissue.3.1.11evaluationAnengineeringreviewofintegritydata,usingengineeringjudgment,riskassessment,calculations,analysis,orothermethodstoidentifyanomalousconditions(i.e.assessmentinitiator)anddeterminewhetheradditionaldetailed

37、assessmentorriskreductionisrequiredtodemonstratefitness-for-service.NOTEAnevaluationcanalsoconsistofanengineeringreviewofproposedchangestothemooringsystemtodeterminetheirsignificanceonfitness-for-service.3.1.12extremeeventAdesignmetocean3seismic,and/oricecondition,withalowprobabilityofexceedance,tha

38、tamooringsystemcanbesubjectedtoduringitsoperationallife.3.1.13failureInsufficientstrengthorinadequateserviceabilityofasystemorcomponenttofulfillitsperformancerequirements.3.1.14fitness-for-serviceAdemonstrationthatamooringsystemhasadequateintegrityfortheintendedoperatingconditionswhilemaintainingdes

39、ignfunctionality.3.1.15floatingproductionsystemApermanentlymooredfloatingplatformthatutilizesthemooringsystemunderconsideration(sameast,hostplatform.,)3.1.16hazardidentificationTheprocessofidentifyinghazardsinthefacility.3.1.17hazardousoperationsOperationsthathaveaconcerningprobabilityofcausinginjur

40、ytopersonnelorpollutiontotheenvironment.3.1.18in-serviceTheconditionthatcharacterizesamooringsystemthathasbeencommissionedandplacedinoperation.3.1.19inspectionAspecificvisualornondestructiveexaminationperformedforcollectingdatarequiredinevaluationofamooringsystem,sintegrity.3.1.20installationComplet

41、eassemblyincludingstructure,topsides,foundationsandstationkeepingsystem.3.1.21integritydataInformationonthedesign,condition,andoperationofamooringsystem.3.1.22lifeextensionTheprocedureofdemonstratingtheextensionoftheoperationallifeofamooringsystembeyondthelifespecifiedduringtheoriginaldesignand/oras

42、originallypermitted.3.1.23managementofchangeAsystemforreviewandapprovalofchangesinprocesses,procedures,orphysicalcomponentspriortoimplementationofthechange.NOTEThisusuallyincludesassessmentofrisk,economic,andscheduleimplications.3.1.24mechanicaldamageAdefecttypethatcanincludedents,bows,gouges,holes,

43、andseparatedorseveredmembers.3.1.25mitigationActionstakentolimitnegativeconsequencesortoreducethelikelihoodofoccurrenceofaneventorcondition.3.1.26mooringAnarrangementofchains,wireorsyntheticropes,anchorsandvariousconnectingcomponentsthatformsastationkeepingsystemforanFPS.3.1.27operatorTheperson,firm

44、corporation,orotherorganizationemployedbytheownerstooperateafloatingproductionsystem.3.1.28originaldesigncriteriaDesignbasisanddesigncodesusedintheoriginalmooringsystemdesign.NOTEThedesigncriteriaincludereferencecodes,metoceanconditions,analysismethods,safetyfactors,andoriginaldesignassumptions.3.1

45、29originaloperatingconfigurationTheoperatingconfigurationthatthemooringsystemwasoriginallydesignedfor.3.1.30ownerApartywhoownsthephysicalinfrastructureassets(pipelines,floatingsystems,orterminals)and/orapartywhoownscapacityrightsinthosephysicalassetsbutdoesnotowntheassetsthemselves.3.1.31performanc

46、ecriteriaCriteriausedinafitness-for-serviceassessmentofthemooringsystem.3.1.32performanceparameterSpecifiesaperformancegoalofthemooringsystem(e.g.,FPSoffset).3.1.33performancestandardBenchmarkagainstwhichactualperformanceismeasured.3.1.34qualitativeriskassessmentProjectmanagementtechniqueconcernedwi

47、thdiscoveringtheprobabilityofariskeventoccurringandtheimpacttheriskwillhaveifitdoesoccur.3.1.35repairTheworknecessarytorestoreadeterioratedstructureorsystemtoaconditiondeemedfit-for-service.3.1.36residualstrengthTheultimatestrengthofamooringsysteminadamagedordegradedcondition.3.1.37riskbasedinspecti

48、onAprocessthatdefinesinspectionfrequencyandmethodsbasedontheprobabilityandconsequenceoffailureofthecomponentorsystem.3.1.38semi-submersibleAfloatingsystemnormallyconsistingofadeckstructurewithseveralwidelyspaced,largecross-sectionssupportingcolumnsconnectedtosubmergedpontoons.3.1.39servicelifeThetimeperiodbetweenamoori