Japanese Concept Designs for OCCS and Ammonia Carrier Receive Approvals

Bulk carrier designed with Oshima’s onboard carbon capture system (source: Oshima Shipbuilding)

Advancements in Maritime Transport Technology

Japanese concept designs for an onboard carbon capture and storage system (OCCS) and an ammonia-powered gas carrier have received approvals in principle (AiPs). These approvals mark a significant step forward in the development of innovative maritime transport solutions.

The designs, developed by Oshima Shipbuilding, include a dry bulk carrier equipped with a membrane-based OCCS and an 83,000-m³ ammonia carrier featuring an IMO Type B independent tank. The AiPs were awarded by ClassNK, confirming that these novel designs meet the regulatory and safety guidelines established by the Japanese class society.

Details of the Approvals

Oshima Shipbuilding, in collaboration with Fuji Electric, received the AiP for the dry bulk carrier design fitted with the OCCS. This approval aligns with ClassNK’s Guidelines for Onboard CO2 Capture and Storage System (Edition 2.0), published in October 2025. These guidelines detail the requirements for OCCS using membrane separation technology. This technology is expected to have a lower power demand and require less installation space compared to traditional amine absorption systems.

In a separate development, Oshima Shipbuilding was granted an AiP for its ammonia carrier, which boasts an IMO Type B independent tank. This type of tank is defined in the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, commonly known as the IGC Code. The Type B independent tank offers advantages in cargo capacity and outfitting efficiency. However, it also demands a higher level of engineering sophistication than other cargo tank types.

ClassNK conducted its review of this concept design based on Part N of its Rules and Guidance for the Survey and Construction of Steel Ships. This review incorporated the IGC Code along with relevant guidelines, ensuring that the designs meet the necessary safety and operational standards.

The Importance of Innovation in Maritime Transport

The maritime transport sector is undergoing significant changes, driven by the need for more sustainable practices. The development of technologies such as OCCS and ammonia-powered carriers is crucial in addressing the challenges posed by climate change. These innovations not only enhance the efficiency of maritime operations but also contribute to reducing greenhouse gas emissions.

By integrating advanced technologies, the industry can move towards a more sustainable future. The approval of these designs is a testament to the commitment of companies like Oshima Shipbuilding to innovate and lead in the field of maritime transport.

Future Prospects

As the maritime industry continues to evolve, the focus on carbon capture, utilization, and storage (CCUS) will become increasingly important. The advancements represented by the AiPs for the OCCS and ammonia carrier designs are just the beginning. Further research and development will be necessary to refine these technologies and ensure their successful implementation in the market.

The ongoing collaboration between shipbuilders, technology providers, and regulatory bodies will play a vital role in shaping the future of maritime transport. It is essential for all stakeholders to work together to promote sustainable practices and drive innovation in this sector.

In conclusion, the recent approvals for the Japanese concept designs highlight a significant milestone in the maritime transport industry. These developments pave the way for a more sustainable future, where advanced technologies can help mitigate the environmental impact of shipping.

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