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Compact semi-submersible vessel launched

Tuesday, 12 Jun 2012

The compact semi-submersible vessel “CSS Derwent”, built for Hallin Marine was recently launched at Drydocks World Nanindah’s yard in Batam, Indonesia.

The launch of the “CSS Derwent” at the shipyard in Indonesia

The newbuilding is based on a concept that has been developed by STX Marine, Hallin Marine, Minnow Marine Projects Limited and M3 Marine. The objective of the concept was to connect the capabilities and low-motion behaviour of a semi-submersible vessel in the smallest feasible form with an industry-leading design in terms of operability. Primary functions of the newbuilding will be well intervention, well stimulation and subsea installations.
The “CSS Derwent” is a twin-hulled vessel of a semi-SWATH (small waterplane area twin hull) configuration, and features diesel-electric propulsion with DP-3 capability. One azimuth thruster at the end of each hull produces a transit speed of up to 12 knots. The twin-hull platform provides a large working deck with a long laydown area. Classed by the American Bureau of Shipping (ABS) as a column-stabilised drilling unit, the newbuilding has space for 152 persons and an endurance of 45 days.
The vessel is fitted with a 150-tonne AHC (active heave compensated) subsea crane and a 160-tonne AHC guided modular handling system operating through a moonpool, as well as a 120-tonne pallet skidding system. For the support of subsea operations two ROV handling systems are provided, one through another dedicated moonpool and the other over the starboard side.