Second order for low-pressure DF two-stroke

25 Mar 2014
The Wärtsilä RT-flex50DF low-pressure 2-stroke dual-fuel engine

The Wärtsilä RT-flex50DF low-pressure 2-stroke dual-fuel engine

Wärtsilä has announced a further order for its low-pressure two-stroke, dual-fuel engine, for an LNG carrier ship being built in China for a Chinese owner.

A five-cylinder RT-flex50DF engine, together with the gas valve unit and other relevant equipment, has been ordered for a new 14,000m³ LNG tanker being built for the Chinese ship owner and operator, Zhejiang Huaxiang Shipping at the Qidong Fengshun Ship Heavy Industry shipyard. The ship is being built according to the Chinese Class Society (CCS) standards, and is due to be delivered in August 2015.

Wartsila describes its low speed dual fuel technology as a “game-changer”. And claims that it offers significant benefits in both capital and operating expenditure. In gas mode it complies with IMO Tier III without any exhaust gas cleaning systems, and can operate on gas at all loads, including idling and manoeuvring, reducing costs.

"We feel that the Wärtsilä dual-fuel engine is excellent, especially the low pressure two-stroke DF version, which we see as being an innovation that meets the demand of the market. As owners, we are very satisfied with this engine technology and believe that it will capture a large share of the market. We look forward to seeing this technology extended to cover other cylinder bores," said Mr Cai Dejiang, general manager of Zhejiang Huaxiang.

Martin Wernli, vice president two-stroke, Wärtsilä Ship Power pointed out that this was the second order received for this engine type, and the first for an LNG carrier, an application for which it is seen as particularly well suited.

Wärtsilä's low pressure LNG concept is a lean burning Otto-cycle gas engine that has additional liquid fuel back-up capability, thereby enabling vessels to operate 100% on LNG. This, says the company, is in contrast to other systems utilising a high-pressure concept, which is merely a conventional diesel engine able to burn gas under certain conditions.

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Wartsila Corporation

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