Mitsui O.S.K. Lines (MOL), Tsuneishi Shipbuilding, and Mitsui E&S Shipbuilding (MES-S) have conducted risk assessments of their jointly developed, ammonia-fuelled liquefied gas carrier. On April 10, they received Approval in Principle (AiP) for the vessel from ClassNK and Lloyd’s Register of Shipping.

According to the three companies, this is the first case ever that two classes AiP, ClassNK and Lloyd’s, have been issued.

The vessel is a mid-size ammonia/LPG carrier equipped with a main engine that can run on ammonia, which emits no CO2 during combustion. The vessel uses some of the ammonia loaded as cargo as fuel, with the aim of achieving net-zero CO2 emissions while underway.

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HAZID studies

Ammonia is expected to be a next-generation clean energy source, but special measures are needed to ensure sufficient safety against its characteristics of flammability, toxicity, and corrosiveness.

In addition, there are currently no international regulations on the use of ammonia as a marine fuel. Therefore, the three companies conducted hazard identification studies (HAZID) with ClassNK and Lloyd’s, respectively, which have in-depth knowledge on ship safety and guidelines for ammonia-fueled vessels. As a result of the risk assessment of using ammonia as marine fuel from multiple perspectives, both classification societies recognised the safety of the vessel’s basic design.

Leveraging the knowledge gained from these risk assessments and AiP acquisition, the three companies will move ahead with the design of the vessel, which will be a net-zero emission ocean-going vessel, with an eye toward delivery around 2026.

Also read: Approval in principle for MOL’s Large Liquefied CO2 carrier design