Wedoany.com Report-Sept. 14, Japanese classification society Nippon Kaiji Kyokai (ClassNK) has granted approval in principle (AiP) for an ammonia-powered LPG/NH₃ carrier jointly developed by Kawasaki Heavy Industries and Mitsui E&S. The certification confirms that the vessel design meets regulatory and safety requirements, supporting its feasibility for future deployment.

ClassNK explained that the vessel concept follows the third edition of its “Guidelines for Ships Using Alternative Fuels.” These rules include provisions for the safe use of ammonia as fuel on liquefied gas carriers, along with additional safety measures for engine rooms. A hazard identification (HAZID) risk assessment was also performed to evaluate safety aspects. According to ClassNK, the requirements address equipment installation, control systems, and protective devices, all aimed at minimizing risks to ships, crews, and the environment when operating ammonia-fueled vessels.

Earlier in July this year, ClassNK carried out a study on the decarbonization potential of the Crystal Odyssey, a dual-fuel LPG/ammonia carrier built by Kawasaki Heavy Industries at its Sakaide Works. The vessel, designed to operate on LPG with future adaptability for ammonia, demonstrated positive results. The study indicated that the use of LPG fuel could reduce carbon dioxide (CO₂) emissions by around 15%. ClassNK described the vessel’s performance as “excellent,” highlighting ammonia’s promise as a pathway toward achieving net zero targets.

Kawasaki Heavy Industries has already delivered multiple LPG/ammonia carriers. Among them is the Crystal Odyssey and the Liberty Pathfinder, named in September last year for Nippon Yusen Kabushiki Kaisha (NYK Line) and chartered to LPG trader and importer Astomos Energy. The Liberty Pathfinder represents Astomos Energy’s fifth vessel of this type. Following this, the Luna Pathfinder, the sixth unit in the series, was christened in early August this year.

Mitsui E&S has also been active in advancing ammonia-fueled technologies. In February 2025, the company began test operations of a large-bore low-speed ammonia dual-fuel engine, calling the trial a “major step” toward decarbonization in maritime transport. This development aligns with broader industry efforts to expand the use of ammonia as a clean energy alternative in shipping.

The recent approval granted by ClassNK for Kawasaki Heavy Industries and Mitsui E&S further demonstrates progress in integrating ammonia-based solutions into vessel design and operation. Together with earlier studies and ongoing test projects, these developments illustrate the growing momentum for low-emission fuels within the shipping sector.

By supporting innovative shipbuilding projects and validating their safety and regulatory compliance, ClassNK is contributing to the advancement of sustainable maritime technology. The collaboration among shipbuilders, classification societies, and energy companies highlights the industry’s ongoing commitment to reducing emissions while ensuring operational safety at sea.