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Wärtsilä Engines Achieve 1000 Orders Milestone

7-cylinder Wärtsilä RT-flex82T version B main engine to power crude carrier tanker

Posted on November 1, 2012

Wärtsilä received its 1000th order for its 2-stroke low-speed diesel, electronically controlled, common-rail RT-flex engines.

The milestone was passed in August with the placing of the 1000th order. This engine will power an efficient Very Large Crude Carrier (VLCC) tanker being built for JX Tanker Company Limited, the Yokohama, Japan, -based tanker company. The 310.000 DWT vessel is being built at the IHI Marine United Inc., Kure shipyard and is scheduled for delivery in 2014. The engine will be manufactured by Diesel United Ltd. (DU), a Wärtsilä licensee in Japan.

The newly upgraded Wärtsilä RT-flex82T version B engine is based on the popular RT-flex82T, which has accumulated more than 100 reference installations and is an ideal choice for VLCC vessels that need an efficient, simple, reliable and safe machinery solution, Wärtsilä said.

The high stroke-to-bore ratio – along with the RT-flex common-rail system in Wärtsilä two-stroke engines – provides superior performance, the company said. The flexibility of engine tuning possibilities makes it possible to achieve the lowest fuel oil consumption in all operational conditions for VLCCs.

"This latest order is significant for Wärtsilä for two reasons: it takes us past the 1000th order milestone for electronically controlled engines with good environmental performance; and is also the first order for the upgraded RT-flex82T version B engine for a next generation eco type of VLCC," said Martin Wernli, president, Wärtsilä Switzerland and vice president, Wärtsilä Ship Power, 2-stroke.

"The success of the Wärtsilä 2-stroke, low-speed diesel engines is due to the fact that they are the only common rail engines on the market that can offer exceptional fuel savings across the entire load range. This is especially the case for eco type new vessel designs such as the IHI Marine United developed next generation VLCC as ordered for the JX Tanker Company,” Wernli said.

Wärtsilä RT-flex engines have an electronically-controlled common-rail system instead of the usual mechanically-controlled fuel injection pumps and exhaust valve drives. Because of the common-rail system, the optimum injection pressure, fuel injection timing and exhaust valve timing are selected at all engine loads or speeds, ensuring efficient combustion at all times, full-load or part-load, the company said.

Wärtsilä said that other advantages of this technology include stable low-running speeds (in the range of 10-12% nominal speed), smokeless operation and improved control of exhaust emissions. For cylinder lubrication, an oil feed rate of 0.6 g/kWh can be achieved.

The common-rail system provides balance in the engine power developed between cylinders and between cycles, with precise injection timing and equalized thermal loads. This offers benefits to ship owners and operators because of extended intervals between overhauls, reducing maintenance costs. The technology of Wärtsilä’s electronically-controlled engines enables customers to better perform in the changing market conditions and to meet the requirements of increasingly stringent environmental legislation, the company said.

The first Wärtsilä RT-flex common-rail 2-stroke engine entered into service in 2001.