Seismic Support Vessel Deals
OSD-IMT, a division of Offshore Ship Designers, secured a design contract for two IMT 965 seismic support vessels with a bollard pull in excess of 50 metric tons for China Oilfield Services Ltd. (COSL), Beijing.
The vessels will be used to provide a range of support activities to larger seismic vessels which operate continuously for months when conducting seismic surveys. Designed to have a multi-role capability in support of the mother ship, they can be used for refuelling, fresh water replenishment, the provision of refrigerated stores and dry provisions, the supply of spares and general stores, emergency towing and escort support and guard duties.
The IMT 965 carries 980 cu. m. of cargo oil for refueling the mother ship, either alongside or ahead. Fuel is pumped to the mother ship from a deck-mounted fuel supply module located on the working deck of the IMT 965. Up to 500 cu. m. of fresh water can be supplied in a similar way.
Cold stores and dry provisions totaling 80 cu. m. can be accessed directly from the working deck of the IMT 965, providing easy access for transfer to the mother ship, either by the ship’s crane or by a crane mounted on the mother ship.
The operating cycle for the IMT 965 requires it to be on station shadowing the mother ship for prolonged periods. During this time the IMT 965’s activities include keeping passing vessels clear of the streamer arrays and ensuring that there is a traffic-free area ahead of the mother ship. The vessel is classed with a DP1 notation which will allow it to shadow the mother ship at a preset distance for long periods.
The main IMT 965 propulsion arrangement is a hybrid system, comprising twin CP propellers, each driven by a medium-speed diesel engine. A PTO/PTI alternator/motor is connected to each main gearbox, and two 360 kWe diesel generators are also provided. The system is arranged such that one main engine can drive both propellers for maximum fuel economy.
IMT 965 Main Particulars
Total Deadweight 1,800 metric tons
Speed 13 knots
(As published in the October 2013 edition of Marine Technology Reporter - www.seadiscovery.com)