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1、IndustryMooringStandards●APIRP2SK–DesignandAnalysisofStationkeepingSystemsforFloatingStructures(2005)●APIRP2SM–RecommendedPracticeforDesign,Manufacture,Installation,andMaintenanceofSyntheticFiberRopesforOffshoreMooring(2001,2007)●APISpec2F–MooringChain(1997)●APIRP2I
2、–In-serviceInspectionofMooringHardwareforFloatingDrillingUnits(2008)37APITensionLimits&SafetyFactorsTensionLimitEquivalentAnalysisFactorofMethod(%ofMBS)SafetyIntactQuasi-static502.0IntactDynamic601.67DamagedQuasi-static701.43DamagedDynamic801.25CourtesyofAPIRP2SK38A
3、PI&ABSTensionCriteriaforMODU●Tensionfactorofsafety–survivalconditionABSAPIAnalysisFactorofFactorofMethodSafetySafetyIntactQuasi-static1.802.00IntactDynamic1.501.67DamagedQuasi-static1.251.43DamagedDynamic1.091.25CourtesyofAPIRP2SK39API&ABSTensionCriteriaforMODU●Tens
4、ionfactorofsafety–operatingconditionABSAPIAnalysisFactorofFactorMethodSafetyofSafetyIntactQuasi-static2.7NAIntactDynamic2.25NADamagedQuasi-static1.8NADamagedDynamic1.57NACourtesyofAPIRP2SK40APIAnchorDesignCriteria●DraganchorsafetyfactorsQuasiStaticDynamicAnalysisAna
5、lysisMODUIntactcondition1.00.8DamagedconditionNotrequiredNotrequiredPermanentMooringIntactcondition1.5Damagedcondition1.0CourtesyofAPIRP2SK41Dynamic&Quasi–StaticAnalysis●Twodegreemotions:surge,DynamicAnalysissway●Staticvesselandlinemovement(catenary)●Ignoreinertiaan
6、ddampingQuasi-staticAnalysis6degreemotions:surge,sway,heave,roll,pitch,yawDynamicvesselandlinemovements42Technologies●Mooring■Geotechnicalandsoilmechanics■Anchorsandpiles■Mooringlegsandtendons●Metocean■Statisticalanalysis■Waves■Current■Wind●Risers■Performance■Struct
7、ures■Flowassurance43ABSAppliedSoftware●ANSYS:GeneralFEM,Strength,strain,soils,heattransmission●NASTRAN:GeneralFEM,Strength,strain●SACS/STRUCAD:Structuralanalysisprogram●FEMAP:GeneralFEMpre-processandpost-processtools●AQWA:Hydrodynamicanalysis,linearfrequencydomain,m
8、otionwithmooringanalysis●OSAS:FEMStructuralanalysisincorporateswaveloadsgeneratedbyAQWADrillingcompaniesneedsoftwaretoanalyzemooringandsta
