IACS’s Proactive
Safe Decarbonisation Initiatives

The International Association of Classification Societies (IACS) is at the forefront of maritime decarbonisation. The IACS Safe Decarbonisation Panel (SDP) is leading initiatives to ensure the safe adoption of alternative fuels and technologies in the maritime industry. This article highlights their proactive measures and future plans.

IACS has published Unified Requirement (UR) H1^* in January 2024. This UR controls ammonia releases in ammonia-fueled vessels, setting safety thresholds for ammonia concentrations in manned spaces. The SDP’s Project Team (PT) is also working on a draft UR for ammonia treatment systems, aligning with the IMO’s guidelines.

* UR H1 on Control of Ammonia Releases on Ammonia Fuelled Vessels

The PT on hydrogen is developing URs for materials, testing, Type C tanks, and swappable tanks. These efforts aim to manage hydrogen’s unique challenges as a marine fuel, ensuring its safe and effective use in the maritime sector.

IACS is addressing safety concerns related to lithium batteries. A draft UR on lithium battery approval has been produced, with further rounds of correspondence underway. The SDP is also focusing on plant configuration and necessary URs to mitigate risks, particularly those related to explosive and toxic hazards.

IACS has identified six feasible technologies for shipborne carbon capture and completed the first risk analysis session. The development of a draft UR on carbon capture is progressing smoothly, crucial for reducing the maritime industry's carbon footprint.

IACS is developing guidance for simulating gas releases using models like Computational Fluid Dynamics (CFD). This aims to standardize the review methodology for gas dispersion analysis reports, ensuring effective management of hazardous gas concentrations.

IACS has initiated a project team focused on nuclear power for maritime applications, collaborating with the IMO, IAEA, and WNTI. The goal is to identify licensing schemes, propose roles for IACS and class societies, and recommend requirements for nuclear-powered vessels..

IACS has partnered with the Singapore Maritime and Port Authority (MPA) to share information, develop technical standards, and conduct joint studies on gas dispersion. This collaboration aims to foster a safer and more sustainable maritime industry.

IACS is leading in advancing maritime safety and sustainability. Through rigorous safety standards and strategic collaborations, IACS is laying a solid foundation for the safe adoption of alternative fuels and technologies. The initiatives of the IACS SDP will play a pivotal role in shaping a greener and safer future.