Page 50: of Maritime Reporter Magazine (April 2004)

Gas Ships

LNG Carriers the plunge. Until now, steam turbines have dominated as propulsion machin- ery for LNG carriers, with their apparent reliability and the ease with which they

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Recent orders for Wartsila 50DF dual- operators including larger cargo capaci- fuel engines for two LNG carriers, eight ty, lower fuel consumption, higher Hex- engines in all. are no coincidence. This ibility in operation, and lower emis- engine type promises benefits for LNG sions. Gaz de France is the first to take 1 RUSTIBUS

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HEAD OFFICE (NORWAY)

Dalseide Shipping

Services AS

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Ph.: +47 561812 00

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Services PTE (Spore) 9 Pandan Road 609257 Singapore

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Services INC 2777 Allen Parkway - Suite1185

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Circle 287 on Reader Service Card can burn the boil-off gas from the ship's cargo tanks while at sea.

The low fuel efficiency of steam tur- bines, however, has already encouraged almost all other shipping segments to switch to diesel-powered ships. As a result of both increased fuel efficiency and increased cargo capacity, an LNG carrier with dual-fuel electric machinery will deliver more natural gas to the offloading terminal even when gas is used as fuel throughout the voyage.

The order last autumn for a 153,000 cu. m. LNG carrier by Gaz de France at

Chantiers de l'Atlantique proves a point.

The ship, due for delivery in 2005, will be propelled by dual-fuel engines and electric propulsion. The heart of the sys- tem is four dual-fuel engines - three 12- cylinder and one six-cylinder Wartsila 50DF - giving a combined output of 39.9 MW.

The ship will be the largest LNG car- rier in service. It will be employed to carry LNG from Norway or Egypt, but is also designed for the alternative of trading on the spot market. This is the second of two similar orders to Wartsila.

In 2002, four six-cylinder 50DF engines, with an aggregate output of 22.8 MW, were ordered for Gaz de

France Energy's 75,000 cu. m. LNG car- rier, also being built at Chantiers de l'Atlantique in Sainte Nazaire.

Once delivered later this year, Gaz de

France Energy will be the first LNG car- rier in service featuring this new propul- sion system. The membrane-type vessel will be employed to carry LNG from

Algeria to France. The service speed is 16 knots, which can be achieved with three of the four generating sets. Like its newer sister ship, the vessel is also designed for spot market trading, such as voyages to the USA. "Wartsila has done extensive research to find a more attractive propulsion solution for LNG carriers," said Mikael •

GAZ DE FRANCE 153500 m3 LNGC 52 Maritime Reporter & Engineering News