B4 SEMI Structures

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1、MOUinOperationCourse(Course2147)StructuresSemi-submersibleUnitsContentsSemiSubmersibleStructuralDesign-Description-SpecialFeaturesStructuraldetailsofSemiSubmersibles©DetNorskeVeritasAS.Allrightsreserved15May2012Slide21ColumnStabilizedUnits.ExamplesBorgstenD

2、olphinThunderhorse.GVA40000RingPontoonDesign.DeepseaHorizon©DetNorskeVeritasAS.Allrightsreserved15May2012Slide3ProductionRigExample.FloatingStorageUnit(FPU)SubmergedInternalTurretHosesProductionUnitBurnerboomMooringLinesFlexibleRisersWellHead©DetNorskeVeritas

3、AS.Allrightsreserved15May2012Slide42RigExamplesTypesofSemiSubmersibles/functionsDrillingRigProductionUnitAccommodationUnitContingencyUnit/Season©DetNorskeVeritasAS.Allrightsreserved15May2012Slide5SemiKeyComponentsBasictypesHull-Twopontoonsconnectedtodeck

4、withcolumnsandbraces-Ringpontoondesign.RingpontoonisconnectedtodeckwithcolumnsColumns-4-8columnconnectingpontoonswithdeckstructureBracesystem-BracesystemisconnectingtheprimarystructurestogetherPositionkeepingsystem-DynamicPositioning(withthrusters)-Mooring

5、Chains©DetNorskeVeritasAS.Allrightsreserved15May2012Slide63EarlySemiDesignsBluewaterRigno.1ThefirstsemisubmersibledrillingrigOceanViking©DetNorskeVeritasAS.Allrightsreserved15May2012Slide7DifferentSemiDesignsAtlantiaSCR-FriendlySemisubmersibleGVA5800FPUforUlt

6、ra-Deepwater©DetNorskeVeritasAS.Allrightsreserved15May2012Slide84ColumnStabilizedUnitsexposedtowavesAirgap=distancebetweentopofwaveanddeckmembers.Evaluationofsufficientairgapshallincludeconsiderationofallaffectedstructuralitemsincludinglifeboatplatforms,ris

7、erbalconies,overhangingdeckmodulesetc.AIRGAPColumn”Runup”loadeffectsRunupeffectiswhenthewaveraiselocallyinfromofthecolumn,andhitthedeck.Thiscanhappenatpositiveairgap.©DetNorskeVeritasAS.Allrightsreserved15May2012Slide9DayLifeofaColumnStabilizedUnitTransitdr

8、aft©DetNorskeVeritasAS.Allrightsreserved15May2012Slide105DayLifeofaColumnStabilizedUnitOperatingdraft–Dailywork©DetNorskeVeritasAS.Allrightsreserved15May2012Slide11DayLifeofaColumnStabili