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vessels Complete twin-screw medium speed propulsion packages have been ordered from MAN B&W for a twin set of 65 m off- shore research vessels. The twins will each be specified and equipped for specific opera- tional tasks, i.e. seismic sourcing and seismic recording. The vessels are designated as an OBC Source Vessel and an OBC (Ocean Bottom Cable) Recorder Vessel, respectively. The design consulting company for this project is Dalian Shipbuilding Technology Research Center Co. Ltd., located in Dalian, China. Both vessels will be built by Liao Nan Shipyard, also located in Dalian, and the delivery of the first vessel is sched- uled to the end of 2006. The operator and owner is BGP/CNPC (China National Petroleum Corporation) and its fleet is mainly based in Tanggu, Tianjin. The oper- ation areas for these two vessels include off- shore China and other overseas destinations. MAN B&W Diesel's Four-stroke Propulsion Sales Manager, Jorgen Vinde, said: "Very low levels of vibration and noise from propellers, engines and propulsion sys- tems are key issues for these installations. A very soft resilient seating arrangement of base frame and sandwich mountings has been applied for the dampening of struc- ture-borne vibrations by upwards of 97 per- cent. Additionally, the ducted propellers have been specially designed and shaped with high priority to low levels of cavitation and noise emission. From an underwater point of view, an absolute decisive factor for the customer is a very silent ship, with min- imal noise emission and disturbance in rela- tion to the seismic exploration equipment." The MAN B&W Diesel twin-screw Alpha Propulsion System type 6L23/30A-DVO, which has been specified for the newbuild- ings, includes: • Main Engines: Two MAN B&W 6L23/30A-D engines, resiliently seated with baseframe and sandwich mountings. Each develops 960 kW (1305 bhp) at 900 rpm. Reduction Gearboxes: Two MAN B&W Alpha AMG8 gearboxes, type 31VO8, with a speed reduction ratio of 900:292. Propellers: Two MAN B&W Alpha type VB560 four-bladed controllable pitch propellers. The 1,900 mm diameter CPP systems are complete with tail shafts, inter- mediate shafts, bearings and stern tube equipment. Control System: In addition to the twin main bridge control station, the complete Alphatronic IIA Propulsion Control and Safety System includes a twin engine room control station. Visit www.maritimeequipment.com/mt & Click No. 30 Main Particulars Length, oa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65.0 m Length, pp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58.4 m Breadth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13.8 m Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.1 m Draft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.5 m Crew 45 Propulsion . . . . . . . . . . . . . . . . . . . . . . . . .MAN B&W Diesel Chinese Seismic Exploration Require New OBC Vessels 16 MTR January 2006 MTR#1 (1-16).qxd 1/9/2006 2:15 PM Page 18
