At an online ceremony on February 27th, 2024, MAN Energy Solutions and China Classification Society (CCS) signed a sub-agreement in line with the Strategic Framework Agreement (SFA) the two parties previously agreed in September 2023 in Beijing. The SFA, on ‘Decarbonisation and Digitalisation in the maritime industry’, is scheduled to last for five years.

The new sub-agreement – the third such between the companies – covers MAN Energy Solutions’ new MAN L21/31DF-M (Dual-Fuel Methanol) GenSet designed at the company’s Danish site in Holeby. It provides for a collaboration between the two companies that will support the new engine in the Chinese market, including all activities associated with its planned Type Approval Test (TAT) in China in Q4, 2024. 

MAN Energy Solutions’ Classification Department in Copenhagen hosted the Sub-agreement signing. Marine Product Department General Manager, Jiang Botao, and Jiangsu Plan Approval Center Manager, Sun Qun, signed on behalf of CCS; while Finn Fjeldhøj, Senior Manager and Site Manager, Holeby, and Lars Ascanius, Senior Manager, Two-Stroke Engine Lifecycle Management, signed on behalf of MAN Energy Solutions.

Jiang Botao said: “MAN Energy Solutions, as a globally-renowned ship equipment manufacturer, takes the lead in the technological advancement of marine alternative-fuel engines and has long been one of CCS’s most important partners. The introduction of the MAN L21/31 DF-M methanol dual-fuel engine provides shipowners with more choices to achieve their decarbonisation goals. We much appreciate MAN Energy Solutions’ contribution and believe that the collaboration between it and CCS in alternative-fuel engines will surely make further contributions to a more sustainable future for the global maritime industry.” 

Sun Qun said: “We have witnessed an increased interest in methanol-fuelled ships in recent years as methanol is an important alternative fuel for greenhouse-gas-emissions reduction. We are delighted to collaborate with MAN Energy Solutions, the leading marine-power solution provider, on this methanol dual-fuel engine to contribute to ship safety and maritime decarbonisation. CCS is fully committed to working with MAN Energy Solutions to complete the approval and delivery of this type of methanol dual-fuel engine.”

Fjeldhøj said: “The MAN L21/31 engine is well-established in the market having notched some 2,750 sales to date. With the shipping market currently experiencing an increased interest in methanol as marine fuel, we feel that the introduction of this dual-fuel engine is timely. This collaboration with CCS will provide great support to the new MAN L21/31 DF-M variant upon its entry to the Chinese market.”

Ascanius said: “It is very positive news for MAN Energy Solutions that we can now reveal this new development with China Classification Society, whom we greatly value as an esteemed partner. This latest announcement represents a further step towards a multi-fuel, decarbonised future that is quickly becoming a prominent consideration for shipowners in all vessel segments and sizes.”

MAN 2131DF-M

The 21/31DF-M is based on a simple port fuel-injection concept that optimises reliability, while simultaneously minimising capital-outlay time. The foundation for the new L21/31DF-M GenSet is the existing L21/31 GenSet, which has accumulated more than 55 million operating hours with thousands of engines in service. Furthermore, the L21/31DF-M power range spans 1,000–1,980 kW, which makes it suitable for most merchant vessels.


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