The International Association of Classification Societies (IACS) has announced a landmark revision to its Unified Requirement UR M78, introducing comprehensive safety requirements for marine engines fueled by ammonia. This update marks a
The International Association of Classification Societies (IACS) has announced a landmark revision to its Unified Requirement UR M78, introducing comprehensive safety requirements for marine engines fueled by ammonia. This update marks a pivotal step toward achieving the maritime industry’s decarbonization goals and supporting the transition to zero-carbon fuels.
The newly published Rev.4 of UR M78 expands its scope to include ammonia as an approved fuel for reciprocating internal combustion engines. This development reflects IACS’s commitment to enabling different propulsion technologies while maintaining its safety standards.
The highlights of this revision to UR M78 include:
- Ammonia added to scope
UR M78 now covers ammonia-fueled engines (specifically anhydrous ammonia), alongside natural gas, ethane, LPG, methanol and ethanol, ensuring regulatory clarity for emerging zero-carbon fuels. - Enhanced Risk Analysis and Mitigation Systems
New requirements mandate gas return/recovery systems and Ammonia Release Mitigation Systems (ARMS) to prevent leaks and manage toxic releases effectively. - Addressing Toxic Hazards and Explosion Risks
The revision introduces measures to mitigate hazards from crankcase leakage, vent systems, explosion relief devices, and flexible hoses, ensuring crew safety. - Updated Engine Safety Concept
A comprehensive safety philosophy now addresses gaps not covered by IMO regulations, integrating advanced monitoring and emergency response protocols. - Design Requirements for Gas Piping and Components
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