Merwede yard provides update on Subsea 7's new flexilay vesselVessel & ROV News // February 16, 2006
Subsea 7's vessel will use the J lay mode and install subsea structures.
IHC Holland Merwede in the Netherlands has provided more details about the new flexilay pipe-laying/offshore construction vessel it is to build for Subsea 7.
Delivery of the vessel will take place in the second quarter of 2008. The pipe laying equipment will be designed and built by Huisman Itrec. According to Subsea 7, the overall cost of the project is estimated to be in the range of US$170-200 million,
depending on options exercised.
The new flexilay ship will be 151.00m overall, with a length between perpendiculars of 138.32m and breadth (moulded) of 28.40m. Depth to the maindeck is 12.50m and draft is 7.50m, with a draught (scantling) of 8.00m.
The ship's deadweight (including payload) at design draft is approximately 11,809 tonnes, and approximately 13,699 tonnes at scantling draft.
The ship’s complement will be 120, and the vessel will be built in accordance with the rules and regulations of Lloyd’s Register, bearing the notation LR + 100A1, “Pipe Laying Ship” UD strength for load of 10 t/m2, Heli Landing Area, LMC, UMS, DP(AA), CAC(3), EP, ICC.
The ship was designed by Merwede Shipyard in close concert with Subsea 7 and the pipelay spread manufacturer. It will be a fully dynamic positioned vessel suitable for worldwide operation, and its pipelay equipment will include a vertical lay system with top tension capability of in excess of 400 tonnes, combined with a storage capacity for flexible pipe based on two 1,250 tonne carousels below deck and a 3,000 tonne carousel or multiple reels on deck. The vessel will have a 400 tonne deepwater crane, a built-in deepwater ROV spread and a comprehensive survey system.
The vertical lay tower is also designed to enable operation in J-lay mode for rigid pipe and the ability to install large structures associated with deepwater riser systems. Subsea 7 has options to have the vessel delivered with both of these capabilities fully operational.
The ship will have a 6.6kV integrated electric power generation system and propulsion by three electromotor-driven fixed pitch propellers in azimuthing nozzles aft. Two retractable Azimuth thrusters will be fitted in the forward part of the vessel; one transverse thruster will be arranged in a tunnel forward.