- ClassNK, based in Tokyo, grants approval in principle (AiP) to the Planning and Design Center for Greener Ships (GSC) for their design of a prismatic ammonia fuel tank (IMO Type B independent tank) intended for container ships.
- Ammonia is anticipated as a key marine fuel for decarbonizing shipping due to its zero CO2 emission when combusted. Despite its potential, challenges such as leakage risk and low volumetric efficiency need to be addressed.
- GSC’s Type B tank design emphasizes safe ammonia storage and minimizes cargo container reduction by considering operational needs. The tank’s storage space shape is simplified from typical bench corners in container carriers, enhancing constructability and fuel volume.
- ClassNK pledges to continue supporting advanced initiatives for decarbonization, including safety assessments, as part of its contribution to the maritime industry.
Advancing Ammonia Fuel Tank Design For Container Ships
In Tokyo, ClassNK has approved in principle (AiP) to the Planning and Design Center for Greener Ships (GSC) for their design of a prismatic ammonia fuel tank (IMO Type B independent tank) intended for container ships.
Ammonia is expected to be used as a marine fuel for shipping decarbonization since it does not emit CO2 when combusted. However, its utilization presents challenges, such as the risk of leakage and relatively low volumetric efficiency.
While Type B tanks require a refined fatigue analysis, it is possible to use ordinary steel as the material for the structure of fuel storage hold space, except for the bottom part which is intended to be a partial secondary barrier, resulting in a reduction in the amount of steel for low-temperature service. Additionally, prismatic tanks offer superior volume efficiency compared to cylindrical tanks as they can be designed to fit the ship’s hold.
Optimizing Ammonia Tank Design
The Type B tank developed by GSC has been designed to ensure safe storage of ammonia and to minimize the reduction in the number of cargo containers due to the placement of fuel tanks in consideration of operational needs. Furthermore, the shape of the storage space for the tank has been simplified from the typical bench corners for container carriers, improving constructability and increasing the fuel volume.
ClassNK carried out the design review of the tank based on Part GF of its “Rules and Guidance for the Survey and Construction of Steel Ships” incorporating the Code and “Guidelines for Ships Using Alternative Fuels (Edition 2.1)”. Upon confirming it complies with the prescribed requirements, ClassNK awarded the AiP.
ClassNK will continue to make contributions to advanced initiatives toward decarbonization, including safety assessments.
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Source: classnk
