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OFFSHORE SUPPORT VESSEL DESIGN REVISITED

Tuesday, January 28, 2020 

In response to industry demands for more versatile, greener vessels for offshore operations, the Damen Shipyards Group has developed a new concept design, the Offshore Support Vessel (OSV) 9020, featuring a stable platform, accommodation for multiple personnel, good station-keeping capability, low carbon emissions and flexibility to add mission-specific tools.

“We were approached by several different operators at the same time, all looking for slightly different offshore capabilities, but similar enough that their requirements could be met with a conceptual standard platform,” said design and proposal engineer Mark Couwenberg.

“The thinking behind the OSV 9020 is very much in line with the Damen philosophy of shipbuilding in series; it’s a standard product, as a result drawing upon proven technology, that can be tailored to individual requirements via modularisation.”

The vessel has been designed to perform a variety of offshore tasks both at surface level and subsea, and can be fitted with options such as a moonpool-deployed saturation dive system, offshore crane, A-frame and an offshore access system. Submarine rescue gear can be included on deck. For such duties, the available vessel accommodation, manoeuvring systems and dive support systems are crucial. The OSV 9020 provides living space for up to 120 persons on board.

“There has been a lot of consideration to make sure the accommodation is both functional and comfortable. For example, care has been taken to ensure proper on board logistics, so that daily routines are as efficient as possible and that working areas are separated from living space,” said Couwenberg.

A helicopter deck is integrated in the design, further increasing flexibility. The hull, superstructure and thruster layout is tailored for DP operation, with equal performance ahead and astern and a profile that ensures low wind catch. The four identical azimuthing thrusters are arranged symmetrically: two on the stern and two on the bow. This ensures maximum station-keeping performance while avoiding high noise levels in the accommodation. The layout results in lower maintenance costs, lower fuel consumption and lower total installed power. Although the main benefits of the design are seen during station-keeping, the transit performance is also efficient.

The power generation system is designed along hybrid lines with diesel generators supported by a battery pack. The electric system is designed to operate safely with closed bus-ties, to operate with fewer engines running, reduced fuel oil consumption and emissions and lower maintenance.

Optionally, green methanol, produced from biological waste streams, can be employed as fuel, cutting well-to-propeller CO2 emissions by about 70%.  In addition to the ease of bunkering offered by green methanol at most ports in the world, it is safe to handle on board and space- and cost-efficient.

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