RT-flex50 tested with repositioned turbo

11 Jun 2012
The version D Wärtsilä RT-flex50 features a repositioned turbocharger to allow fitting in smaller engine rooms

The version D Wärtsilä RT-flex50 features a repositioned turbocharger to allow fitting in smaller engine rooms

Wärtsilä says that it has successfully tested an RT-flex50 engine with the turbocharger installed on the driving end side, increasing the possibility of fitting the engine to other ship types, particularly smaller vessels.

The engine, known as version D, is intended to run at lower rpm for reduced fuel consumption and lower exhaust emissions, including smokeless operation, especially at low engine load. The company says that the new version, which is narrower, can be used for ship designs with slim stern sections where the current standard execution, with turbochargers mounted on the exhaust engine side, does not fit. Typical applications would be small bulker and tanker vessels, 'handysize' and container vessels, and feeder ships. The RT-flex50 D can now be used instead of other engine types with smaller cylinder bore and higher speed. In many cases it will allow the use of one fewer cylinder and can thus reduce maintenance costs. The low rotational speed of the engine and propeller allows a significant reduction in total fuel consumption.

The RT-flex50 is a low speed, two-stroke engine with fully electronic control of the exhaust valve activation and fuel injection, intended for operate on both MDO and HFO, of different qualities. The version D has the turbocharger sited directly above the fly wheel at the driving end of the engine, and shares most major components with the rest of the RT-flex 50 portfolio.

"With the new RT-flex50 version D Wärtsilä completes its product range in this market segment. This engine opens new market potential for Wärtsilä two-stroke engines," says Martin Wernli, president, Wärtsilä Switzerland and vice president, product centre two-stroke.

Testing of the engine took place at licensee Hyundai Heavy Industries in South Korea.

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