JUNE 7, 2012 — The Drydocks World Nanindah shipyard in Batam, Indonesia, launched Singapore-based Hallin Marine's Compact Semi-Submersible, CSS Derwent. on June 5. Expected delivery is at the end of 2012.
The CSS concept has been developed by STX Marine, in partnership with Hallin Marine; Minnow Marine Projects Limited and M3 Marine, over a five year period to capture the capabilities and low-motion behavior of a semi-submersible vessel in the smallest form feasible, giving an industry-leading design in terms of operability.
The CSS Derwent is a twin hulled vessel of a semi-SWATH configuration, and features diesel electric propulsion with an azimuthing thruster at the ends of each hull. The twin hull platform provides a large stable work deck area with a long laydown area and low motions.
"CSS Derwent is a further example of Hallin's commitment to provide innovative solutions to the offshore subsea services sector," comments Hallin Marine's Founder and Group CEO John Giddens. "With accommodations for up to 152 personnel, she is a multi-service vessel built for complex subsea operations and work scopes that cross a wide spectrum of duties including construction support, IRM and light/medium well intervention."
"CSS Derwent meets the challenges of safe deck handling with a 160 metric t active-heave-compensated guided Module Handling System and a 150 t crane capable of working at water depths of 3,000 m, supported by dedicated 120 t pallet and skidding system." said Mr. Giddens. "She is fully prepared for subsea construction operations such as the installation of subsea trees, manifolds, flowlines, umbilicals and subsea structures as well as providing support to existing fields with inspection maintenance and repair services."
Responding to the huge challenges of deepwater operations, the innovative CSS design delivers exceptionally stable sea-keeping characteristics. A very large zone 1 rated deck (1,300 square metres) and long lay down area ensure good project load carrying capacity and meet the requirements of potential hydrocarbon management.
Classed by ABS as a DP Class 3 Mobile Offshore Drilling Unit (MODU), the CSS Derwent incorporates technology from industry-leading providers such as MacGregor (lifting systems), Rolls-Royce (engines and thrusters), Kongsberg (dynamic positioning)and ABB (power management), maximizing safety in operations and minimising cost through fuel-efficient diesel electric propulsion.
CSS Derwent carries two dedicated Quantum XP 225 hp deepwater construction class ROVs cabable of working at 3,000 m water depth. Designed to undertake the most demanding and power intensive subsea tasks in very deep water, the ROVs are housed below deck together co-located with built-in control rooms and workshops. They can be deployed through a dedicated centerline moonpool or from a starboard side launch position. The ROVs feature the latest technical advancements, including dynamic positioning (ROVDP), advanced diagnostics and the ability to plug and play standard instrumentation and tooling.