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Planer for MEK 4450Marine operasjonerKværner ASA, June 2011
Lift phases
Load outTransportationOver boarding
Removal of sea fasteningLift upLifting routeStart lowering
Splash-zoneSlammingWave impacts
LoweringSofter system,- resonance
LandingPositioning
Sea fastening
Limiting weather criteria (transit, WoW)
Low complexity
Easy, swift and cost effective installation
Swift removal. Minimized need for hotwork during removal
Lifting from deck of vessel
Well defined route of lift. Static capacity of crane (DAF=1.3?)
Clearance to ships side
Restraining load from unwanted motions
Test lift for all complex routings!
Vessel ballasting. Vessel roll reduction not to be used.
Slewing before luffing.
Sufficent analysis performed?
Splash zone
Often dimensioning for crane force
Vessel listed towards lifted object
Bouyancy reduces mass of objectBallasting of vesselCrane wire tension
Sufficient time for air to evacuate
No use of AHC
Stability of lifted objectInternal tanksAir filled compartment
Further lowering
Is the total duration understood?Fatigue issues on the loadEffects on the crane and wire
Load rotation control
Increased weight of the wire.
Generally no use of AHCDeep water resonance
Deep water effects
Landing
Position control vs tolerancesPosition, Heading and Inclination
Landing speedDamage moduleSoil damage (stiff clay)
Reduction of tension in crane wireVessel movement and ballasting
Capacity of AHC
Disconnection of rigging