Rolls-Royce powers world's first tug driven by natural gas engines

By Peter Pospiech at October 15, 2013 03:31
Filed Under: Company News, drive systems, Fuels & Lubes, LNG fuel, Shipyards, Workboats
Rolls-Royce has congratulated Sanmar Shipyard for the completion of the world's first gas powered tug, in a ceremony in Istanbul, Turkey, this weekend. Sanmar has completed the first of two tugs for Norwegian customer Buksér og Berging, which each feature two Rolls-Royce Bergen C26:33L6PG engines fueled purely by natural gas (stored as LNG), with a combined output of 3,410kW (1,705 kW each) at 1,000 rev/min.The lean-burn engines operates on the Otto cycle with mixture compression and an external ignition source.A rich gas/air mix in a precombustion chamber is ignited and forms a strong ignition source for the very lean mixture in the cylinder for knock-free combustion. The engines are direct coupled to Rolls-Royce azimuthing Z-drives mounted aft in ASD configuration with controllable pitch propellers. Also, the new hull and propulsion system will achieve up to 20% higher thrust efficiency compared to standard designs. The LNG system is designed by AGA Cryo and comprises an ... [More]

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