| IACS Trends |

The IACS withdrew Unified Requirement (UR) H1 as of January 2025, following the completion of the draft IMO Interim Guidelines for the Safety of Ships Using Ammonia as Fuel at the 10th session of the Sub-Committee on Carriage of Cargoes and Containers (CCC 10), as the draft is expected to be approved at the 109th Session of the Maritime Safety Committee (MSC 109) and IACS UR H1 was found to have gaps compared to the provisions of the Interim Guidelines.

Currently, IACS is developing various URs and Unified Interpretations (UIs) to supplement the IMO Interim Guidelines for Ammonia-Fuelled Ships.

In addition, IACS has revised UR M77 to allow the use of aqueous ammonia as a reductant in Selective Catalytic Reduction (SCR) systems based on risk assessment and in consideration of the IMO Interim Guidelines. This amendment provides a regulatory basis for utilizing aqueous ammonia generated on ammonia-fuelled ships as a reductant for emission control.

Furthermore, IACS is developing guidelines that cover a wide range of alternative fuels and technologies, including methanol, hydrogen, batteries, carbon capture, and gas dispersion analysis.