ClassNK has awarded an approval in principle (AiP) for the ammonia fuel supply system and ammonia gas abatement system developed by Mitsubishi Shipbuilding Co., Ltd.
Ammonia is expected to be used as a ship fuel for decarbonization since it does not emit CO2 when combusted. Meanwhile, adequate safety measures are imperative as it has been pointed out that ammonia is toxic to humans and corrosive to materials. ClassNK has been involved in projects aiming for zero-emission ships using ammonia fuel in terms of safety assessment, and has issued its "Guidelines for Ships Using Alternative Fuels" as a necessary standard to minimize the risks related to ammonia-fueled ships for the ships, crews, and environment by stipulating requirements for installation, controls, and safety devices.
ClassNK carried out a review of the conceptual design of the systems developed by Mitsubishi Shipbuilding for WinGD's large low-speed two-stroke ammonia-fueled engine based on Part C of its "Guidelines for Ships Using Alternative Fuels". Upon confirming they comply with the prescribed requirements, ClassNK issued the AiP.
ClassNK will actively continue to take part in advanced initiatives toward decarbonization and also support the decarbonization of the entire industry by incorporating the knowledge gained through collaboration with front runners into rules and guidelines.
