Classification society Korean Register (KR) has granted approval in principle (AIP) for Hi-CLEARS, a safety solution for ammonia-fueled ships, developed by the affiliates of South Korean conglomerate HD Hyundai – HD Hyundai Heavy Industries (HD HHI) and HD Korea Shipbuilding & Offshore Engineering (HD KSOE).

As disclosed, Hi-CLEARS is a safety-enhancing system set to capture ammonia gas leaked during operation, converting it into aqueous ammonia, and using it as a reductant in a selective catalytic reduction (SCR) system. The solution reportedly eliminates potential ammonia leakage and achieves “zero discharge” of ammonia to the atmosphere and sea.