MAN’s New Small-bore Engine Solution Complies To C2-emission Standards


  • MAN Energy Solutions has developed a small-bore engine solution.
  • The new legislation will primarily apply to inland waterways, coastal areas, and most rivers.
  • With the introduction of the C2 emission standard, sales is expected to grow.

MAN Energy Solutions has developed a new small-bore engine solution that complies with China’s Stage II – commonly known as the C2-emission standard (GB15097 regulation) – due to enter into force in July 2021, says a press release published on their website.

Expected sales 

The new legislation will primarily apply to inland waterways, coastal areas, and most rivers, covering the domestic bulk carriers, feeder containers, oil tankers, passenger RoRos and government vessels. With the introduction of the C2 emission standard, the company expects to grow sales of its small-bore, four-stroke MAN L21/31 engine type.

Challenging NOx & HC Limits  

The regulations not relate to limit the NOx and hydrocarbons (HC) but also to particulate matter (PM), which is attracting increased focus from the maritime industry. Particularly the limits are challenging for type 2 marine engines with single-cylinder displacements of under 15 liters, and an overall power output of <2,000 kW.

Impact of new regulations

Finn Fjeldhøj, Head of Small-Bore, Four-Stroke Engineering, MAN Energy Solutions said, “As soon as C2 came on the horizon, we realized it was an excellent opportunity for our MAN L21/31 engine, whose compactness, low fuel-oil consumption, and power rating make it particularly suited to this segment”. 

Extensive testing shows that it complies with C2 particulate-matter limits without needing a particulate filter, while an SCR system will be required to meet NOx requirements. In practice, such an SCR system will be sparingly employed to optimize engine efficiency and limit after-treatment operational expenses. We are confident that this practical solution will win favor in vessels sailing Chinese inland waterways.

Requirements will be fulfilled

MAN Energy Solutions states that the MAN L21/31 engine can fulfill requirements of both controllable-pitch-propeller (CPP) propulsion and Genset applications. 

Based on recent research, MAN is already capable of pursuing the engine’s official emission certificates from the China Classification Society but continues to develop more advanced solutions with its licensees to further reduce the engine’s environmental impact and customers’ operational costs.

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Source: MAN ES


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