ClassNK approves Niigata dual-fuel engine design

26 Nov 2014
Niigata’s 28AHX dual-fuel engine

Niigata’s 28AHX dual-fuel engine

Japanese classification society ClassNK has granted design approval to the 28AHX-DF dual-fuel engine developed by Niigata Power Systems.

The engine is to be used in Japan’s first gas-fuelled ship other than LNG carriers, namely an LNG-fuelled tug being built by Keihin Dock for NYK Line.

According to ClassNK, demand for new LNG-fuelled tonnage is being advanced by the ECA sulphur limits and IMO Tier III NOx limits. High costs associated with low sulphur fuels, and the increasing availability of LNG, is driving both vessel owners and machinery manufacturers to consider the use of LNG as fuel.

The Niigata 28AHX-DF is a medium-speed dual-fuel engine of 280mm bore and 390mm stroke rated at 320kW/cylinder maximum at 800rpm. It was developed for use primarily in offshore support vessels and tugs. It operates on both diesel fuel and LNG in order to meet the 2015 ECA 0.1% sulphur emissions regulations and comply with IMO Tier III NOx emission requirements. The engine was developed with support from Japan’s Ministry of Land, Infrastructure, Transportation & Tourism (MLIT), and from ClassNK, as part of the society’s Joint R&D for Industry programme.

Mr. 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 first engine will undergo operational trials in December, on completion of which it is expected to receive full ClassNK type approval.

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