ClassNK issues Approval in Principle (AiP) for Spray form insulation system of IMO Type B tank for LNG and Ammonia Fuel

ClassNK has issued an Approval in Principle (AiP) for Spray form insulation system of IMO Type B tank for LNG and Ammonia Fuel developed by Nihon Shipyard Co., Ltd. and Hankuk Carbon Co., Ltd. The certification demonstrates its feasibility from regulatory and safety perspectives.



For the large-capacity fuel tanks required on large container ships and ammonia-fuelled vessels, IMO Type B tanks are gaining recognition as an alternative to Type C tanks, offering superior cargo efficiency and outfitting flexibility.



For the design concept and result of demonstration mock-up test for the Spray form insulation system of IMO Type B tank, ClassNK conducted its safety review based on the part N of its 'Rules and Guidance for the Survey and Construction of Steel Ships', which incorporates the IGC Code, and also the part GF, which incorporates the IGF Code. Upon confirming its compliance with the prescribed requirements, ClassNK issued the AiP.