Coastguard OPV runs on LNG

By Keith Henderson at October 24, 2010 19:21
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The KV Sortland, is the last of a class of three 93m LOA OPVs delivered to the Norwegian Coastguards in July 2010. The Barentshav (Bering Sea) Class is a world first application of LNG in this type of vessel. The Norwegian contracting shipbuilder is Myklebust Verft AS, Gursken, with hulls being produced by the Severnav yard in Romania.

The hybrid propulsion system offers a choice of three propulsion modes: gas electric, diesel mechanical or both. When using LNG, the reduction in emissions compared to operating on MDO is around 90 per cent for NOx with a CO2 emission reduction of approximately 25 per cent.

The propulsion system comprises a single Rolls-Royce Bergen B32:40L8P diesel engine running on MDO fuel and rated at 4,000 kW at 750 rpm. It is connected through a mechanical drive to a CPP with nozzle. On the propeller shaft there is a 2,500 kW electric propulsion motor. Electric power is provided by LNG fuelled gensets comprising three MHI GS16R-MPTK gas engines rated at 978 kW and a single MHI GS12R-MPTK gas engine rated at 600 kW. A control system automatically starts and stops the genset depending on power needs. Using gas electric propulsion only, the speed is 15.5 kts, on the single diesel alone it is 18 kts and hybrid (mechanical and gas electric 20 kts.
The hull is equipped with a bow and a stern thruster and for improved maneuverability there’s a 883 kW retractable azimuthing thruster in the bow.
In addition to normal coastguard work, the multi purpose vessels which have an ice classification 1C, are designed for towing and rescue operations, oil recovery and fire-fighting. In addition there is a collaboration agreement with France and UK for a NATO Submarine Rescue System capability.

The Norwegian Coastgaurd Barentshav (Bering Sea) Class is a world first application of LNG in this type of vessel.

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