ClassNK gives thumbs up for NPS’ dual-fuel engine

The classification society ClassNK reports it has granted approval to the design of the new 28AHX-DF dual-fuel engine developed by Niigata Power Systems.

The new engine is slated to be used as the main engine on a new LNG-fuelled tugboat being built by Keihin Dock for NYK Line.

The vessel will be Japan’s first LNG-fuelled vessel, excluding LNG carriers, stands in ClassNK statement.

Niigata’s 28AHX-DF is a medium-speed duel-fuel engine with a maximum rated power per cylinder of 320kW and was developed for use primarily in offshore support vessels and tugboats. The engine, which operates on both diesel fuel and LNG, will meet the strict 0.1% sulfur emissions regulations in the ECA that are set to go into effect in 2015, as well as comply with the IMO’s stringent Tier III NOx emission requirements.

Yukihisa Shibata, General Manager of ClassNK’s Machinery Department said, “The demand for dual-fuel engines is increasing as IMO restrictions tighten and the industry recognizes the importance of environmental accountability. Supporting the development of such low-emission engines is one way we can help ship operators and manufacturers practically address the challenges of these new regulations, and encourage the wide spread use of this new technology.”

The dual-fuel engine has a maximum rated speed of 800 min-1 with a cylinder bore of 280mm and a 390mm stroke. The model engine will undergo trial operational testing and is expected to receive type approval from ClassNK in December.

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Press Release; Image: ClassNK


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