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CENTRE FOR OFFSHORE FOUNDATION SYSTEMS

Part II

Introduction to

Offshore Structures

Hodjat ShiriCentre for Offshore Foundation Systems (COFS)

July 2009


Offshore Installation of Fixed Platforms:

• Topsides :

• Jackets :

Lifting by HLV

Floatover by FLB


Topside Lifting Installation:• HLV Positioning & Mooring• Transportation Barge approach• Transportation Barge Mooring alongside HLV• Lifting rig connection• Slings Tensioning• Sea-fastening cutting• Topside lifting• Transportation Barge release• HLV Re-positioning • Deck mating• Installation Completion


Topside Lifting Installation:

HLV

Topside Barge


Topside Lifting Installation:• HLV Positioning & Mooring• Transportation Barge approach• Transportation Barge Mooring alongside HLV• Lifting rig connection• Slings Tensioning• Sea-fastening cutting• Topside lifting• Transportation Barge release• HLV Re-positioning • Deck mating• Installation Completion


• FLB Anchoring• FLB Approach to Jacket• FLB Enter Jacket Inside• FLB Mooring to Jacket• Sea-Fastening Cutting• Barge Ballasting• Deck Mating & Load Transfer (Jacking, Ballasting…)• Mating Completion• FLB Release• FLB Anchor recovery• Installation Completion

Topside Float Over Installation:


• HLV Positioning & Mooring• Transportation Barge approach• Transportation Barge Mooring alongside HLV• Lifting rig connection• Slings Tensioning• Sea-fastening cutting• Jacket lifting and upending• Transportation Barge release• HLV Re-positioning • Jacket positioning ( Position, Orientation, Direction)• Pile Driving• Installation Completion

Jacket Lifting Installation:


Jacket Launching Installation:• Launch Barge Anchoring • Launching Arms Preparation• Buoyancy Tanks check• Barge Approach to right position• Sea-fastening Cutting• Barge Ballasting and Tilting• Jacket Sliding & Barge Moving• Jacket launching & Floating• Jacket Upending (Lifting or Self-Upending)• Jacket Positioning ( Tugs or HLVs)• Pile Driving• Installation Completion


Jacket Launching Installation:


Launching Analysis:

Launching

Self-UpendingBarge Release

1 2 3

4 5


Jacket Pile Driving :

• Pile Transportation Barge comes alongside HLV• Pile Preparation• Jacket Preparation• Hammer Preparation • Pile Lead Section lifting up and Stabbing into jacket leg or Sleeve• Hammer lift up and stabbing on top of pile • Pile driving according to engineering sequences• Lifting up the First add-on, Stabbing to Lead section, Welding• Non Destructive Tests on Welds (NDT)• Pile Stopper Removal and Driving first add-on• Regular check of Jacket level ness • Continuos Blow Count and Dynamic Stress Applied on Pile• Continue to Finish Pile Driving• Installation of Crown Plates• Installation of Transition Pieces



Hydraulic Hammer Diesel Hammer

Pile Lift Up

Piles Arrangement

Hammer Stabbing



Completed Jacket Pile Cut-off Crown Plate Welding

Pile in Driving


End of Part Two

Thank You

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