IACS Enhances Safety Standards For Alternative Fuel Engines With Revised UR M10

As the maritime industry embraces alternative fuels to meet decarbonization goals, the associated safety challenges have necessitated stricter standards. The International Association of Classification Societies (IACS) has responded with the fifth revision of its Unified Requirement (UR) M10, focusing on preventing crankcase explosions in engines fueled by gas or low flashpoint fuels.

Key Enhancements in UR M10

1. Crankcase Construction and Explosion Relief:
   • Crankcases must withstand pressures from potential explosions.
   • Engines with crankcase volumes exceeding 0.6 m³ require additional explosion relief valves compliant with IACS UR M66 standards.
2. Airflow and Pressure Control:
   • Airflow Requirements: External airflow into the crankcase must adhere to safety specifications, reducing the risk of fuel vapour accumulation.
   • Crankcase Pressure Control: Ensures safety devices like oil mist detectors function effectively during forced extraction of crankcase atmospheres.
3. Explosion Mitigation Measures:
   • Lower Explosive Limit (LEL): The LEL for gas or fuel mixtures within the crankcase has been defined to ensure gas concentrations stay below explosive levels.
   • Safety Evaluations: Engines must undergo comprehensive evaluations to verify explosion risks are minimized.
4. Essential Monitoring Devices:
   • Engine Bearing Monitors: Temperature monitoring devices for engine bearings are now mandatory safety components.
5. Documentation Requirements:
   • Manufacturers and designers must provide detailed documentation to validate the effectiveness of implemented safety measures.

Industry Collaboration

The revisions were developed with engine manufacturers and other stakeholders, ensuring the guidelines are practical andalignedn with current technological advancements.

Commentary from IACS

Robert Ashdown, Secretary General of IACS, emphasized the organization’s commitment to safety:

“By introducing enhanced safety requirements tailored to modern engines and fuel types, UR M10 ensures the industry can mitigate explosion risks while embracing sustainable fuels.”

Implications for Stakeholders

Industry stakeholders are urged to review and integrate these changes into their safety protocols to ensure compliance and enhance operational safety. The revised UR M10 reflects the evolving landscape of maritime operations, prioritizing safety without compromising the shift towards environmentally friendly fuels.

This proactive approach by IACS underscores its dedication to balancing innovation with robust safety measures in the maritime sector.