World’s first AiP for Ammonia Floating Storage and Regasification Barge (A-FSRB) issued


ClassNK has issued an Approval in Principle (AiP) for an ammonia floating storage and regasification barge (A-FSRB) jointly developed by NYK Line, Nihon Shipyard Co., Ltd. (NSY), and IHI Corporation (IHI). This is the world’s first AiP for A-FSRBs handling ammonia as cargo.

The A-FSRB is an offshore floating facility that can receive and store ammonia that has been transported via ship as a liquid, warm and regasify ammonia according to demand, and then send it to a pipeline onshore. According to its developers, the design offers the advantages of shorter construction time and lower costs in comparison to the construction of onshore storage tanks and regasification plants.

ClassNK carried out the design review of the A-FSRB in line with its Part PS of Rules for the Survey and Construction of Steel Ships and Guidelines for Floating Offshore Facilities for LNG/LPG Production, Storage, Offloading and Regasification. Currently, there are no international regulations for floating storage and regasification facilities when the cargo is ammonia, and it is expected that the unique requirements of ammonia will have to be reflected in the design.

Therefore, the companies and ClassNK conducted a comprehensive risk identification of various contingencies and worked to identify technical issues from the initial study stage. The risk identification was conducted using the gap analysis method, which identified differences between conventional ships and offshore floating facilities (heavy oil, LNG, etc.) and evaluated the impact of such differences. Based on its review and the risk identification results, ClassNK issued the AiP for the A-FSRB.

Separately, ClassNK has released amendments to its Rules and Guidance for the Survey and Construction of Steel Ships, some po which are as follows:
• Amendments of requirements for strength assessment by cargo hold analysis based on feedback from impact study carried out with the cooperation of various shipyards on ClassNK’s comprehensive revision of its structural rules
• Increase of the maximum applicable plate thickness of rolled steels for low temperature service used for cargo tanks of ships carrying liquefied gases in bulk and fuel tanks of low flash point fuels such as LNG.
• Specification of requirements for ships equipped with accumulator battery systems using large-capacity lithium-ion batteries and the relevant class notations
• Amendments on the requirements for thickness measurements at Special Surveys for the ships applicable to ESP Code in accordance with the MSC Resolution and IACS UR
• Addition of measures against hydraulic lock of steering gear in accordance with the IACS UR
• Prohibition of the use of antifouling paints containing cybutryne in accordance with the MEPC Resolution
The amendments are available via “My Page > Rule Amendments for Technical Rules” on the ClassNK website