Yanmar dual-fuel engines to feature in Japanese tug

Yanmar has supplied engines for a Japanese-built LNG-fuelled tug (Yanmar)
Industry Database

Osaka-based Yanmar Co has delivered two dual-fuel commercial marine engines to Kanagawa Dockyard for installation in what will be the first occasion of an LNG-fuelled tug constructed in Japan based on the IGF Code.

The tug concerned is under construction for Mitsui O.S.K Lines, Ltd (MOL) and will be operated by Nihon Tug-Boat Co Ltd, the LNG fuel itself supplied by Osaka Gas Co Ltd. The engines selected for the new vessel will be 6EY26DF models, capable of operation on heavy fuel oil as well as LNG, Yanmar has secured the order also for additional equipment including the LNG fuel tanks, buffer tanks and gas combustion devices that make up the LNG fuel feed system for the engines.

Technical specifications of the 6EY26DF dual-fuel engine include: a rated power of 1,618kW from six cylinders each with a bore and stroke of 260mm and 380mm respectively. MOL will take delivery of the new tug once construction is completed, scheduled for February 2019 and entry into service is planned for April 2019.

The subject of alternative-fuel tugs has been a regular topic at industry conferences for several years now as owners, operators and port authorities, not to mention towage customers face regulatory as well as public demands for operations with reduced impacts on the environment. The reduction of emissions is an important area for attention, particularly where harbour tug operations are located close to built-up areas. Hybrid propulsion is one option allowing zero-emissions when for example in low-load operating modes while the LNG-fuel route is another option, particularly when there is a nearby source of the fuel. The dual-fuel trio Dux, Pax and Audax delivered to Østensjø Rederi by Spanish shipbuilder Gondan in 2017 are fine examples now in use for Statoil at the Melkøya terminal in Norway.

The IGF Code is the name for the International Code of Safety for Ships Using Gases or other Low-Flashpoint Fuels. The mandatory IMO code came into effect on 1 January 2017 and is intended to minimise the risk to vessels, their crews and the environment given the potential hazards with such fuels and covers the design, construction and operation of vessels using fuels including LNG.

By Peter Barker

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