Marine Log - August 2007 - (Page 25) ENVIRONMENT this area. LNG-fueled ferries are already being operated by Fjord1 on the Norwegian west coast, as well as some offshore service vessels in the North Sea. The new feeries are 128m x 19.1m double-endeddesigns. Each has a maximum capacity of 536 passengers and 198 cars, or alternatively a mixture of cars and larger vehicles. Three of ferries require a 21-knot service speed. Each of these vessels is fitted with four Rolls-Royce Bergen generator sets.Each vessel has two KVGS-16G4 sets, each producing 3,535 kW at 1,000 rev/min, plus two engines of the same type, but with 12 instead of 16 cylinders, each developing 2,650 kW. The two 17-knot ferries have two Bergen KVGS-12G4 generator sets developing a combined 5,300 kW. Rolls-Royce gas engines produce much lower emissions than diesel engines of the same power. Using LNG as fuel cuts CO 2 emissions by about 20% compared with an engine running on marine diesel and producing the same power. NOx emissions are reduced by about 90% and sulphur oxide emissions are practically zero. “The key to the high efficiency of Rolls-Royce gas engines is our lean burn combustion technology,” says Lutz Liebenburg, Head of Engine Development. The new ferries are fuelled by road tanker and the gas on board is carried in a large insulated flask. The liquefied gas is drawn off as needed, warmed to evaporate it and fed to the engines as a gas, the whole installation meeting both DnV class rules and Flag State requirements. EIDESVIK LNG FUELED PSV Eidesvik Offshore ASA and Vik + Sandvik have already shown themselves to be environmental innovators in the shipping industry. This month, Eidesvik will take delivery of Gass Avant, a Vik + Sandvik-designed LNGfueled Platform Supply Vessel (PSV). Designed to DNV’s Clean Design and built by West Contractors yard in Ølensvåg, Norway, under a NOK 322 million (about $54.7 million) contract, the 5,600-grt Gass Avant is destined for North Sea and Barents Sea operations. The Gass Avant builds on Eidesvik’s experience with the LNG-fueled M/V Viking Energy, a Vik + Sandvik VS 4403 design PSV built by Kleven Verft AS. The 94.9m x 20.4m Viking Energy features four Wartsila 6L32DF dual fuel main engines, each rated at 2,010 kW (2,734 hp), with two Rolls-Royce Contaz25 azimuth thrusters and four ABB/AMG 630 S10 main generators, rated at 2,400 kva. Eidesvik reports that when it is operating on LNG, NOx emissions are reduced by 84% and CO2 by 20% as compared with Marine Fuel Oil (MFO). Unlike the Viking Energy, the Gass Avant will combine the LNG technology with Vik + Sandvik’s distinctive Avant ship design with the superstructure aft. Eidesvik reports that operational experience with the Viking Avant, the first Avant vessel, has shown a substantial improvement of the physical work environment on board. The FellowSHIP supply vessel will also be built using an Avant ship design. The Gass Avant’s main engines are dual-fueled, allowing for operation on ordinary MFO when LNG is not available. ML www.marinelog.com AUGUST 2007 MARINE LOG 25 http://www.wqis.com http://www.wqis.com http://www.wqis.com http://www.marinelog.com
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