September 9, 2010
Rolls-Royce power for LNG-fueled ferry
Rolls-Royce has released more details on the gas engines and main azimuth thrusters it is supplying for what will be the world's largest gas- fueled ferry.
The 129.9 m x 18. 8 m double-ended ferry is being built to Multi Maritime AS's MM120FD LNG design and will have a capacity of 242 cars on two decks and 600 passengers
As we reported June 23, Norwegian operator Fjord1 has ordered the ferry from Fisker Strand BLRT AS, a joint venture between Fiskerstrand Verft AS of Norway, and Western Shipyard in Klaipeda, Lithuania. Hull construction and initial outfitting will be carried out at the Klaipeda yard, while completion will be at Fiskerstrand Verft.
With a deadweight in excess of 1,300 t the 7,000+grt ferry will be equipped with four azimuth thrusters powered by a gas-electric plant consisting of three large Rolls-Royce LNG gas engines and generators. It will have a service speed of approx. 20 knots.
"In planning the new ferry, Fjord 1 called for a substantial increase in efficiency," explained Matias Mork, Sales Manager - Rolls-Royce System Solution Merchant Vessel.
"The Rolls-Royce Azipull thrusters, two at each end of the vessel, have pulling propellers and streamlined underwater units which turn the swirl energy from the propeller water into useful thrust. They are a key to raising efficiency, in combination with the latest LNG fueled gas engine design from Rolls-Royce. A significant improvement was found on the final model testing compared to existing ferries," Mork said.
Designer Multi Maritime undertook extensive studies and tank testing were undertaken in cooperation with Rolls-Royce to optimize the hydrodynamic integration of the Rolls-Royce AZP100 azimuth thrusters and the hull.
Three Bergen C25:33L9A nine cylinder gas engines power the four thrusters through an electric transmission. The C-series is a new design of gas engine now going into production, taking over from the older K series fitted in the existing five ferries on these routes. It uses the same lean burn combustion principle but incorporating the latest engine technology. The result, compared with conventional ferries burning liquid fuels, is a major reduction in CO2 and NOx emissions and the virtual elimination of soot and sulfur emissions.
A Bergen C-series diesel engine genset will also to be installed to power the vessel in case it should need to serve as a reserve ferry on routes without gas supply, or in emergency.