New Wärtsilä 62 and 72 bore electronically controlled low speed engines.

By Keith Henderson at May 24, 2011 04:09
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Wärtsilä announce the addition of two new 62 and 72 bore engine series to their RT-flex two stroke, low speed programme. The primary targets for the 62-bore engine are smaller capesize bulk carriers, Panamax bulk carriers, Aframax tankers, and handysize container vessels. The 72-bore engines are ideal applications for capesize bulk carriers, Suezmax tankers, and Sub-Panamax to Panamax container vessels.

Caption: Impression of the new Wartsila 7RTflex62 developing up to 18,620 kW at 97-103 rpm.
Image credit: Wärtsilä Corp.

According to Wärtsilä, the new engines offer significant benefits to both shipowners and operators by way of high propulsion efficiency, reliability, and optimised total cost of ownership. The stroke/bore ratio offers good internal efficiency with a gain of 1-2 percent compared to current engines, and depending on the vessel type, the lower engine speeds make it possible to improve propulsion efficiency by 2-6 percent.

The two new engine series employ well-proven Wärtsilä low-speed technology, together with electronically-controlled fuel supply and control. The smaller engine series has a bore of 620 mm and stroke of 2,658 mm, is offered in four to eight cylinder configurations with a maximum cylinder output of 2,660 kW at 97-103 rpm. The larger 72 engine series uses a bore of 720 mm and stroke of 3,085 mm and is offered with four to eight cylinders, each with an output of 3,610 kW at a speed of 84-89 rpm.

Caption: Extended engine layout field of the new Wartsila RT-flex62 and RT-flex72 series.
Image credit: Wärtsilä Corp.

Development work on the new engines was carried out at Wärtsilä's Low-Speed Competence Centre in Winterthur, Switzerland following a feasibility study in 2010. Wärtsilä's licensee partners in Asia are closely involved in the manufacturing process and all Wärtsilä licensees will have the right to build the new engines. The first 62-bore engine will be available for delivery in September 2013 and the first 72-bore engine will be available approximately one year later, in 2014. From the outset, the new engines are IMO Tier II compatible and are available with IMO Tier III solutions.

Caption: Table of Specifications showing extended layout fields.
Image credit: Worldmarine Ltd, data source: Wärtsilä Corp

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