Yanmar delivers engines for LNG tugboat
The vessel, the first LNG-fuelled boat to be built under the IGF code in Japan, will be completed in February next and will commence operation in April. As well as the two 6EY26DF engines, Yanmar has also received orders for LNG fuel tanks, buffer tanks, and gas combustion devices that make up the LNG fuel feed systems for the engines.
The MOL-owned vessel will be manufactured by Kanagawa Dockyard Co and operated by Nihon Tug-Boat Co. The LNG fuel will be provided by Osaka Gas Co.
Yanmar claims that an innovative air flow control system – with waste gate valves controlling inlet air according to cylinder pressure – not only prevents knocking and misfiring, but also enables owners to install smaller engines.
Compared to the EY26 diesel engine, the 6EY26DF delivers 84% NOx, 25% CO2, and 99% Sox and PM reductions, meeting IMO’s Tier III NOx limits. In gas mode the new engine exceeds Yanmar’s current diesel engine thermal efficiency ratios, at 46.8%.
An eight-cylinder version of the EY26 engine is under development.
