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LNG Powered Ferry


An environmentally compatible vessel, which will use liquefied natural gas (LNG), was ordered from Norwegian shipbuilder Langsten Slip & Baatbyggeri. The 95 m double-ended passenger and vehicle ferry will have a diesel-electric installation driving propulsion thrusters at each end of the hull and will be fitted with four 650 kW generating sets comprising diesel engines adapted for LNG combustion.
The principle of propulsion redundancy is implemented, as the power required for normal schedule keeping will be approximately 1,000 kW, compared with the total of 2,600 kW provided by the multi-genset installation using two drivelines. The generators, electric motors, frequency converters and transformers will be supplied through the Trondheim arm of the German engineering firm Siemens. The make of main machinery has yet to be decided, and it appears that the local manufacturer Ulstein Bergen, which has been in the vanguard of lean-burn, gas-fuelled diesel technology, will not be involved.
She will be laid out for 300 passengers and the ro-ro arrangements will provide for 100 cars, alternatively eight trailers plus 42 cars, or other permutations. Overall loading capacity is 640 tones within main dimensions of 94.8 m length between perpendiculars, 15.7 m maximum beam and 5.15 m depth. The LNG cylinders forming the fuel storage will be installed at tanktop level, below the main vehicle deck, and the total bunker capacity of 60 cu m will be sufficient for one and a half weeks' service on her allotted, fjord route. The vessel is scheduled for delivery on January 20, 2000.
Every aspect of the shipboard systems had been considered from an ecological aspect, such that very tough criteria were set for exhaust gas emissions, waste handling, refrigerants and underwater coatings. It is claimed that the arrangements will drastically cut atmospheric pollution, since the emissions of harmful nitrogen oxides (NOx) will be 90% less than that of a conventional, oil-burning propulsion system. Apart from the environmental benefits, however, it seems that there will be no immediate economic operating gains.
More information: <Lloyd's List -- 03-02-99, p. 7>


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