Dual fuel plant powers new LNG carrier

27 Oct 2010
View of the engine room onboard ‘Castillo de Santisteban’ with its dual-fuel MAN 8L51/60DF engines

View of the engine room onboard ‘Castillo de Santisteban’ with its dual-fuel MAN 8L51/60DF engines

Five dual-fuel MAN engines comprised the diesel-electric propulsion plant for the LNG vessel ‘Castillo de Santisteban’ recently delivered by STX Offshore & Shipbuilding to the Spanish shipping group Empresa Naviera Elcano.

The five MAN dual-fuel 8L51/60DF engines each deliver 8,000kW at 514 rpm to power the 300m long LNG carrier which has a 173,600 m3 carrying capacity. The newbuilding has been assigned by her charterer, Spanish energy company Repsol – Gas Natural LNG (Stream), to the Peruvian Camisea/Pampa Melchorita gas project, the first natural-gas liquefaction plant in South America.

Klaus Deleroi, senior vice president, MAN Diesel & Turbo SE, said: “When it comes to ship-propulsion technology, the future is gas. Not only for LNG carriers, but also for cargo vessels, ferries and even cruise liners. Knowing this, it is important for MAN Diesel & Turbo to have a strong reference already at sea with our new 51/60 dual-fuel engine, and that is exactly what we have with the Castillo de Santisteban.”

The LNG carrier recently passed extensive gas and sea trials before the hand-over to its owner. Its entry into active service represents a milestone for MAN in that the order for the ship’s dual-fuel engines, registered in 2007, was the very first received for this engine type. The engine is especially designed for propulsion systems for LNG carriers and gas-fuelled ships, and focuses on the safety requirements stipulated by classification societies for gas operation.

The vessel’s new propulsion system is designed to give it a higher degree of redundancy in terms of maintenance while sailing, and takes advantage of the 51/60DF engine’s multiple fuelling options. The 8L51/60DF engines were built at MAN Diesel & Turbo’s own works in Germany. They can run on gaseous (for example, vaporised LNG) or liquid fuels of a wide range of qualities (HFO/MDO/MGO) and have low emission levels.

At 1.5 g/kWh (IMO cycle E2) in gaseous-fuel operating mode, the 51/60DF already complies with future IMO Tier-III limits for NOx by a considerable margin without the need for exhaust-gas treatment or any other countermeasures.

MAN’s 51/60DF dual-fuel engine offers 1,000 kW/cylinder output at 514 rpm for 60-Hz generator sets in both its gaseous and liquid-fuel operating modes. For marine applications, it is offered in inline versions with 6, 7, 8 and 9 cylinders and V- configuration versions with 12, 14, 16, and 18 cylinders in a power range from 6,000 to 18,000kW.

MAN’s new engine model uses the common-rail micro-pilot fuel-injection system for liquid fuel that is necessary when running on gas to ignite the air-gas mixture. This system ensures independent control of injection timing, injection pressure and injection volume. When running on liquid fuel, the 51/60DF works with a conventional fuel-injection system, injecting the fuel oil through a separate main fuel injector in a camshaft-actuated pump-line-nozzle system. The fuel injection control is integrated within the engine’s SaCoSone (Safety and Control System).

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