Mitsubishi Heavy Industries secures ClassNK approval for LNG Methane Reduction System

Mitsubishi Heavy Industries subsidiaries MHI Marine Machinery & Equipment and Mitsubishi Shipbuilding have received Approval in Principle (AiP) from ClassNK for a methane oxidation catalyst system designed for LNG-fueled ships.

The system targets methane slip in engine exhaust gas. Methane is a powerful greenhouse gas, so reducing it can significantly cut emissions.

The companies developed the system with Daihatsu Infinearth. MHI-MME handled catalyst design and manufacturing. Mitsubishi Shipbuilding led onboard integration. Daihatsu optimized engine performance.

Initial testing showed strong results. The system achieved over 90% methane oxidation during trials.

Engineers are testing the system on the LNG bunkering vessel KEYS Azalea. The ship is operated by KEYS Bunkering West Japan with support from NYK Line.

The AiP confirms the design meets safety and technical standards. It also supports further development and commercialization.

The partners will now move toward full-scale deployment. They aim to accelerate adoption across LNG-powered vessels.

The project supports global efforts to cut shipping emissions. It also aligns with MHI’s strategy to expand its energy transition business and improve environmental performance in maritime transport.