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Maritime Propulsion

May 5, 2014

Wärtsilä Introduces 46DF Dual Fuel Engine

Wärtsilä announced the debut of its new dual-fuel 46DF engine which it said offers lower specific fuel consumption, higher output and attractive lifecycle costs . The fuel flexible Wärtsilä 46DF engine was developed for the high-output market segment, including cruise ships and ferries, merchant vessels, LNG carriers and FSRUs (Floating Storage and Regasification Unit) and offshore vessels and platforms, and is capable of operating on natural gas, heavy fuel oil or marine diesel oil.
The Wärtsilä 46DF consists of two different versions to meet specific customer needs. The high efficiency version offers drastically lower fuel consumption with a cylinder power of 1,045kW, while the high power version is capable of a cylinder power of 1,145kW with excellent engine thermal efficiency. For LNG carrier applications, the Wärtsilä 46DF can offer fuel savings of as much as 20 tons/day compared to the first introduced DF engines. With up to 14 fewer cylinders installed, the overall lifecycle installation costs are positively impacted by roughly $1,000 per day. When operating in gas mode, the Wärtsilä 46DF engine is compliant with IMO Tier III regulations without any secondary exhaust gas purification systems. When fueled by gas, the sulfur oxide (SOx) and carbon dioxide (CO2) emissions are notably reduced, and smokeless operation is attained. In liquid fuel oil mode, the Wärtsilä dual-fuel engines are fully compliant with the IMO Tier II exhaust emission regulations set out in Annex VI of the MARPOL 73/78 convention.


(As published in the April 2014 edition of Maritime Reporter & Engineering News -

heavy fuel oilmarine diesel oilnatural gas