IJMUIDEN, the Netherlands -- Offshore Ship Designers is to design a series of new fuel-efficient seismic support/chase vessels ordered by French contractor Bourbon, which will be built at Dubai’s Grandweld Shipyards.
The six, 53-m (174-ft) long vessels will feature a fuel-efficient hybrid propulsion system designed as an economic solution for the varied conditions required to support seismic surveys. These include transit speed, slow speed escort, and support work plus a high degree of maneuverability.
The vessels will be chartered by Bourbon to CGGVeritas with delivery of the first slated for end-2012.
Key feature of the hybrid propulsion system include:
• Two main marine diesel propulsion engines, two controllable pitch propellers in nozzles, two main gearboxes each with a PTI electric propulsion motor and three diesel-driven generating sets, and two electrically driven bow tunnel thrusters
• Diesel-mechanical mode using main engines only for the transit operation
• Diesel-electrical mode with main engines declutched using PTI propulsion motors powered by the gensets for chase and slow speed operation
• Boost mode with main engines and PTI propulsion motors (powered by the gensets) engaged used for towing operation
• Automatic selection among the different propulsion modes.
Main particulars are length 53.8 m, beam 13 m (42.6 ft), depth 5.8 m (19 ft), load draft 4.8 m (15.7 ft), cargo fuel capacity 850 cu m (224,546 gal), marine gas oil fuel 260 cu m (68,685 gal), potable water 100 cu m (26,417 gal), refrigerated and dry storage capability as well as space on deck for stowage of stores containers.
OSD to design efficient seismic support vessels
Offshore Ship Designers is to design a series of new fuel-efficient seismic support/chase vessels ordered by French contractor Bourbon, which will be built at Dubai’s Grandweld Shipyards.