The MAN 35/44DF CD can reduce methane slip by up to 85% compared with industry standards and offers 16% greater output than competitors.
MAN Energy Solutions has successfully completed the Type Approval Test (TAT) for its dual-fuel MAN L35/44DF engine. Both variants of the 35/44DF engine were tested: the methane-capable 35/44DF CD and the methanol-compatible 35/44DF CD. They are designed as auxiliary generator sets (720 RPMs) and for electric propulsion (750 RPMs).
“The 35/44DF CD is a future-proof concept with all the latest technology, including full connectivity and cyber security,” said Sephardim Koblenz, Vice President and Head of Licensing, Four-Stroke Marine & License, MAN Energy Solutions. “The 35/44DF CD’s reliability, fuel efficiency, low methane-slip, and cost optimization are also crucial to the engine’s resumé. In developing this engine with our partner, STX Engine, we had low cost and easy localization as clear targets.”
Six classification societies participated in testing at STX Engine’s Changwon headquarters in South Korea from April 7 to 11.
“We have worked closely with STX over the past three years in developing the MAN 35/44DF CD,” said Alexander Knafl, Senior Vice President, MAN Energy Solutions. “We anticipate broad appeal, especially among container vessels and LNG carriers. In addition to its strong output, other advantages of the MAN 35/44DF CD include its effective reduction of methane slip and its future-fuel readiness for methanol and other fuel types.”
The L35/44DF CD engine is an enhanced version of the L35/44DF CR engine launched in 2015. It has an adaptive combustion control system that monitors combustion conditions in real time to ensure optimal fuel-injection conditions.
The engine, being built by Chinese licensee CSSC-MES Diesel Co., Ltd., is the first of 12 bound for a series of 12 × 24,000 20-foot equivalent unit container vessels currently under construction:
Each engine will also feature MAN Energy Solutions’ exhaust gas recirculation (EGR) turbocharger emissions system.
“At MAN Energy Solutions, our vision of 'Moving Big Things to Zero' motivates everything we do in developing the engine technology to operate on those fuels vying for prominence in the future market,” said Bjarne Foldager, Head of Two-Stroke Business at MAN Energy Solutions. “This latest milestone is just the latest fulfillment of that. By harnessing the potential of methanol, we are bringing the maritime industry closer to zero-emission solutions, and we fully expect methanol to figure prominently as a future fuel across all segments.”
