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Marine Log

April 4, 2007

Hitachi Zosen to build Wartsila RT-flex engines

Japan's Hitachi Zosen is the latest Wartsila Corporation licensee to manufacture Wartsila RT-flex electronically-controlled common-rail marine engines.

Hitachi Zosen was awarded a contract in March 2007 by Wartsila Corporation to build four six-cylinder Wartsila RT-flex50-B engines for ships to be built in China.

The first of the ships will be delivered in the second quarter 2009.

The engines each have a maximum continuous power of 9960 kW (13,560 bhp) at 124 rpm.

Hitachi Zosen, with its Ariake engine works in Kumamoto Prefecture, Japan, thus becomes the eleventh engine builder to manufacture Wartsila RT-flex electronically-controlled common-rail marine engines. The others are located in South Korea, Japan, China, Italy, Croatia and Poland.

Wartsila RT-flex marine low-speed engines incorporate telectronically-controlled common-rail technology for fuel injection and valve actuation. The technology provides great flexibility in engine setting, bringing benefits in lower fuel consumption, lower minimum running speeds, smokeless operation at all running speeds, and better control of other exhaust emissions.

RT-flex engines are available in eight cylinder sizes covering a power range from 5,800 to 80,080 kW.

The RT-flex50-B is the smallest of these, providing prime movers of 5,800 to 13,280 kW well suited to the propulsion of bulk carriers in the Handymax to Panamax size range, product tankers and 900-1500 TEU feeder container vessels.

The first RT-flex50 engine entered service in January 2006. The engine type has been very successful in the market with some 85 engines already sold.