Thursday, 9 September 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.

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