Nippon Kaiji Kyokai (ClassNK) has awarded SRC an Approval in Principle (AiP) for its innovative tank design, Methanol Superstorage. This concept utilizes Sandwich Plate System (SPS) technology, which significantly enhances shipboard storage capacity for methanol and ethanol, nearly doubling the volume compared to conventional fuel tanks. The ClassNK AiP indicates that Methanol Superstorage meets the Society’s guidelines for vessels using alternative fuels, specifically methyl and ethyl alcohol.
Unlike traditional tanks that require a minimum 600 mm cofferdam between internal and external walls, Methanol Superstorage employs a 25-mm-thick solid elastomer core sandwiched between steel plates. This design results in an 85% increase in storage capacity, addressing the challenge posed by methanol’s lower energy density compared to heavy fuel oil (HFO). Ryohei Sakai from ClassNK emphasized the growing interest in fuel storage solutions as more methanol-ready ships are being constructed or are already in operation.
To ensure compliance, methanol-fueled vessels must undergo an alternative design process, with final approvals resting with the flag state. Panama’s expertise was incorporated in the review, and it also granted AiP to Methanol Superstorage. Alex Vainokivi from SRC highlighted that this approval marks a significant milestone in gaining industry acceptance, noting the tank’s enhanced fire protection and minimal impact on vessel design during retrofitting.
