Multi-role accommodation ship features increased stability

Edda Accommodation’s new multi-purpose vessel provides stabilised accommodation for 800, features DP capability and can travel at speed under its own power Edda Accommodation’s new multi-purpose vessel provides stabilised accommodation for 800, features DP capability and can travel at speed under its own power

A novel stabilisation system is an important feature of a newbuild accommodation vessel ordered by Edda Accommodation, writes Dag Pike.

The system that is claimed to offer excellent stability, with a monohull design. By using a monohull concept, Edda hopes to have a vessel that can easily move from one site to another on a worldwide basis under its own power, providing greater flexibility than most offshore accommodation units.

The key to the new design is a roll reduction system, developed by Hoppe Marine, and tank tested in the Marintek ship model basin. The roll damping is achieved by having a large diameter U-shaped tube installed in the hull of the vessel that extends for the full beam. This tube or tank is partially filled with water which is set in motion in a way that transfers the water from side to side to balance out the ship motions. The movement of the water in the tube is controlled by air valves fitted into the top of the tube that allow compressed air to be forced in to control the location of the water ballast in the tube.

The system is reported to be equally effective when the vessel is underway and when it is stationary, as when connected to a rig or platform. The vessel will be powered by four azimuthing thrusters, two at the stern and two at the bow, providing dynamic positioning capability and avoiding the need for installing moorings. The DP system, developed by Kongsberg Marine, employs the propulsion thrusters for station keeping if the vessel shifts location when stationary, providing accommodation for personnel working on installation, maintenance and decommissioning of offshore installations.

The vessel will have accommodation for up to 800 people in one- and two-person cabins. In addition there are recreation rooms, two swimming pools, a sauna, a gym and conference rooms plus an auditorium. To aid the transfer of personnel the vessel will be fitted with a telescopic, motion compensated transfer gangway 55m in length. The cargo deck area extends to 2,000m² and will be equipped with a 30m crane as well as smaller cargo cranes, offering true multi-role capability.

The 155m long accommodation vessel has been designed by Salt Ship Design and will be built by Hyundai Heavy Industries in South Korea. Completion is scheduled for 2015. Edda Accommodation claims that the new design will offer significantly lower investment and operating costs compared with semi-submersible rigs and the ability to re-position the vessel at short notice is a bonus

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