IACS Publishes New Recommendation on Gas Dispersion Analysis (Rec.202)

Supports safe, responsible progress to decarbonsation through best practice for ships using alternative fuels such as ammonia and hydrogen

12th November 2026: IACS, the membership organisation for the world’s leading classification societies, has published a new Recommendation on gas dispersion analysis, marking a further significant contribution in its support of the safe decarbonisation of the maritime industry. The new guidance provides information on the best practices and requirements for carrying out gas dispersion analysis for Ships using gaseous fuels such as Ammonia and Hydrogen.

Rec.202 is another significant deliverable from the IACS Safe Decarbonisation Panel and draws on several years of technical work and engagement with fuel manufacturers, technology providers, shipowners, shipbuilders, marine insurers and flag States. It provides a critical technical framework to support the safe use of alternative fuels such as ammonia and hydrogen, helping the maritime industry transition responsibly toward cleaner energy solutions.

Recognising that the International Code of Safety for Ships Using Gases or Other Low-Flash-point Fuels (IGF Code) does not currently provide prescriptive requirements to address the hazards presented by alternative low or carbon-free alternative fuel options such as Ammonia, Hydrogen, etc., the IMO has developed interim guidelines for these fuels, including provisions for risk assessment and gas dispersion analysis. IACS’s Rec.202 supports this regulatory framework by providing detailed technical guidance for industry, IMO and other key stakeholders.

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