ClassNK has issued an Approval in Principle (AiP) for a groundbreaking retrofit design that converts a conventional-fueled Kamsarmax bulk carrier into a methanol dual-fuel vessel. This innovative design concept is the result of a joint development effort between TSUNEISHI SHIPBUILDING Co., Ltd. and the Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping. The AiP underscores the regulatory viability of the retrofit, marking a pivotal step toward decarbonizing the current global fleet.

Kamsarmax bulk carriers are widely used in global trade, and the ability to retrofit them with alternative fuel systems could have a significant impact on reducing emissions in the maritime sector. The newly approved concept focuses on modifying Tsuneishi’s standard Kamsarmax design to incorporate methanol as an alternative fuel source. Methanol is gaining attention as a cleaner-burning option that can support the maritime industry's transition toward low-carbon operations.

The retrofit project tackles several key technical challenges, including the strategic placement of methanol fuel tanks and the integration of a compliant fuel supply system. By addressing these aspects, the project aims to establish a scalable and practical model for other vessels of similar size and type, potentially accelerating the shift to green shipping solutions across the industry.

ClassNK conducted a thorough evaluation of the design in accordance with its "Part A Guidelines for Ships Using Methyl/Ethyl Alcohol as Fuels (Edition 3.0.0)," which form part of its broader “Guidelines for Ships Using Alternative Fuels.” The review also included a hazard identification (HAZID) risk assessment to ensure the safe implementation of the retrofit elements. Following this assessment, the classification society confirmed the concept’s feasibility from both a design and regulatory standpoint. This included verification of the methanol tank arrangement and the associated fuel handling systems.

With the issuance of this AiP, ClassNK reaffirms its commitment to supporting maritime decarbonization through rigorous safety evaluations and regulatory guidance. The retrofit model not only represents a technical milestone but also sets the stage for scalable green transformations within the mid-size bulk carrier segment. As the industry faces increasing pressure to meet environmental targets, such forward-looking projects highlight practical pathways toward sustainable shipping.

ClassNK continues to collaborate with industry partners to enable the transition to alternative fuels, ensuring that safety and compliance remain at the core of maritime innovation.