The International Association of Classification Societies (IACS) has made a significant revision to its Unified Requirement UR M78, introducing essential safety standards for ammonia-fueled marine engines. This update is crucial for the maritime industry’s decarbonization efforts and the shift toward zero-carbon fuels.
The newly released Rev.4 of UR M78 now includes ammonia as an approved fuel for reciprocating internal combustion engines, alongside existing options like natural gas and methanol. Key highlights of the revision include enhanced risk analysis and mitigation systems, which require gas recovery systems and Ammonia Release Mitigation Systems (ARMS) to prevent leaks. Additionally, the revision addresses toxic hazards and explosion risks through improved measures for crankcase leakage and vent systems.
Further, the updated safety philosophy incorporates advanced monitoring and emergency protocols, ensuring comprehensive safety beyond existing IMO regulations. Manufacturers must also provide detailed technical documentation for ammonia engines, which will be uniformly enforced by IACS Member Societies starting July 1, 2027. This framework empowers stakeholders to pursue zero-carbon shipping with confidence, reinforcing IACS’s role in maritime innovation and sustainability. For more information, visit the IACS website.
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