ClassNK has awarded dual Approval in Principle for a bulk carrier with OCCS and an 83,000 m³ ammonia carrier, promoting shipping decarbonization.
The Tokyo-based classification organization ClassNK has granted Approval in Principle (AiP) for two significant concept designs aimed at achieving decarbonization targets in maritime shipping. The approvals cover a bulk carrier equipped with a membrane-based Onboard Carbon Capture and Storage System (OCCS) and an ammonia carrier with a capacity of 83,000 cubic meters featuring an IMO Type B independent tank.
Both of the developed projects are signed by the Japanese shipyard Oshima Shipbuilding Co., Ltd. The carbon capture system on the bulk carrier was designed in collaboration with Fuji Electric Co., Ltd.
World's First Comprehensive Framework for Membrane-Based OCCS
In October 2025, ClassNK defined the world's first technical requirements for OCCS systems using membrane separation methods in its 'Guidelines for Onboard CO2 Capture and Storage Systems (Version 2.0).'
Membrane-based systems are expected to require lower energy consumption and less installation space compared to traditional amine absorption. This provides a significant advantage, particularly in terms of integration with existing vessels.
The concept design of the bulk carrier was examined in accordance with the aforementioned guidelines and was found to comply with regulations and safety requirements.
AiP for 83,000 m³ Ammonia Carrier
The second project that received AiP is an ammonia carrier with a capacity of 83,000 m³, equipped with an IMO Type B independent tank system.
Type B tanks, as defined under the IGC Code, offer advantages in terms of cargo capacity and equipment efficiency, despite requiring high engineering precision. ClassNK conducted the evaluation in accordance with the relevant sections of the 'Rules and Guidance for the Survey and Construction of Steel Ships' and the IGC Code.
As a result of the technical reviews conducted, it was confirmed that both concept designs comply with the anticipated regulations, and the AiPs were officially granted.
Emphasis on Decarbonization
ClassNK announced that it will continue to contribute to advanced decarbonization projects in the maritime sector through safety assessments and technical guidance.
These two AiPs signify a new direction for the industry, particularly in the fields of carbon capture technologies and alternative fuel transportation. Maritime shipping is now carrying not only cargo but also the energy equation of the future.
Source: SeaNews Türkiye
