ClassNK has released the second edition of its “Guidelines for Onboard CO₂ Capture and Storage Systems”, marking a world-first by incorporating provisions for systems using the membrane separation method. The updated guidelines aim to support the safe development, manufacturing, and installation of onboard CO₂ capture systems (OCCS) across a broad range of vessel types.
Expanding Decarbonization Solutions at Sea
As the maritime industry explores multiple pathways to decarbonization, interest in capturing CO₂ from ship exhaust is gaining traction alongside alternative fuels. In 2023, ClassNK published the first edition of the guidelines focusing on OCCS based on the amine absorption method. These systems capture CO₂ using chemical absorption but require a constant supply of amine solution.
New Focus on Membrane Separation Technology
Edition 2.0 expands on the original framework by introducing requirements for OCCS using the membrane separation method. This approach offers a lower energy demand compared to amine-based systems and eliminates the need for continuous amine solution supply, making it a more flexible and potentially efficient option for various vessel types.
With the release of Edition 2.0, ClassNK has also reorganized the core functional requirements for OCCS, defining a set of universal safety and performance criteria applicable across different CO₂ capture technologies. The updated guidelines are expected to accelerate the safe adoption of onboard carbon capture solutions, supporting the maritime industry’s broader decarbonization goals.
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Source: ClassNK
