Damen’s Offshore Support Vessel (OSV) 9020 concept has been devised to meet operator demand for customisation while sticking to a proven, standardised design.
Marc Couwenberg, Damen design and proposal engineer, reveals: “We were approached by several different operators, all looking for slightly different offshore capabilities – but similar enough that their requirements could be met with a conceptual standard platform." Throw in a hybrid diesel-electric power arrangement, plus the option for methanol-fuelled operations, and the vessel also offers the benefits of a reduced carbon footprint.
Designed to perform both surface-level and subsea support tasks, the OSV 9020 was developed in modular fashion. “The vessel can be fitted with a moon pool-deployed saturation dive system, to allow diving operations,” Couwenberg continues. “[The OSV 9020] can also act as a submarine rescue vessel; for this, submarine rescue gear is placed on deck. To ensure suitability for this scope of work, the available vessel accommodation, manoeuvring systems and dive support systems are crucial features.”
A helideck has been integrated into the vessel’s design, and other options include: moon pool/over-the-side work-class ROV launch and recovery systems (LARS); a heave-compensated crane and A-frame, with a capacity of up to 200tonnes; a motion-compensated gangway, with or without an elevator; and a davit-launched, 12-man daughter craft.
Depending on the configuration selected, the OSV 9020 can offer 900m2 of deck space. The vessel would accommodate up to 120 persons across 49 cabins and maintain position in sea state 5 conditions. The OSV is also intended to provide equally good ahead and astern performance. Damen states: “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 OSV 9020 would run on diesel generators supported by a battery pack. The vessel type can also use green methanol, which would slash well-to-propeller CO2 emissions by about 70%, Damen estimates. “Methanol is easy to handle safely on board, and is cost-efficient,” the company continues. “Additionally, methanol sacrifices very little design capacity so that the vessel does not need to be larger to achieve a similar endurance.”