MaK ‘green’ engine package for OSV

26 Oct 2011
The MaK M 25 C engine

The MaK M 25 C engine

Caterpillar Marine Power Systems is to provide four MaK engines - two 6 M 25 C and two 9 M 25 C - for the diesel electric system for an offshore supply newbuild, ordered from Astilleros Gondán in Spain.

The 9 M 25 C engines are rated at 3,000kW at 750rpm, and the 6 M 25 C engines will develop 2,000kW @ 750rpm. All four engines feature a new air injection system, designed to ensure load response remains in a low rpm range. Compressed air is injected after the turbocharger, causing what the company describes as a “diffuser effect” that supports the turbocharger performance. Andreas Banck, supervisor diesel engine test team says: “Compared to Jet Assist offered by the competitors our system will not put any extra load on the turbocharger.”

The engines provide the core of Siemens Bluedrive PlusC diesel electric propulsion systems. The new vessel will be operated by Norwegian owner Ostensjo Rederi and is scheduled for delivery in autumn 2013.

To reduce environmental emissions, the engines feature an SCR catalyst operating over the load range of 10-100% and a reduction in fuel consumption throughout the operation cycle for an offshore supply vessel. Fuel consumption testing results have demonstrated the effectiveness of the IMO II-compliant MaK engines, with average fuel consumption expected to be at least 15% below the fuel consumption of comparable propulsion systems in offshore vessels operating today.

“The goal of this specific newbuild project was to have a significant reduction of environmental emissions, in both NOx and CO2,” said Ulf Hanneman, Caterpillar Marine Power Systems territory sales manager. “The new air injection system on the MaK engines, combined with the engines’ stellar fuel consumption, made the MaK power solutions the ideal choice for this offshore application.”

“With the new air injection system Caterpillar can offer a tool that improves the load acceptance capabilities of the engine at any condition” said Banck. “It’s a simple system with a proven design and as reliable as the engine.”

According to Caterpillar, the collaborative effort of Cat dealers Pon Power Scandinavia and Finanzauto are integral to the success of this project. Both dealers will remain engaged in product support and service throughout the construction and subsequent operation of the vessel. The engines will be delivered in spring 2012.

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