ClassNK donates AiP for liquid hydrogen cargo containment system – ShipInsight
The classification society ClassNK has issued an approval in principle (AiP) to Kawasaki Heavy Industries, for the design of a cargo containment system (CCS) of the largest capacity in the world (class of 40,000 m3 per tank) developed for use on a large liquefied hydrogen transporter.
Hydrogen should be used as a clean energy source to achieve a carbon-free society because its combustion does not emit CO2. To contribute to the maritime transport of hydrogen, which is expected to expand its use around the world, ClassNK published in 2017 the “Guidelines for Liquefied Hydrogen Carriers” describing the safety requirements for carriers of liquefied hydrogen based on the IMO Interim Recommendations for the Carriage of Liquefied Hydrogen in Bulk. ClassNK also participated in the classification survey when building a liquefied hydrogen pioneer, Suiso border, with a load capacity of 1,250 m3 built by Kawasaki according to its rules and guidelines
Having received a request from Kawasaki, ClassNK proceeded to the review of the design of the new CSC for a hydrogen liquefied transporter based on its rules for the control and construction of steel ships incorporating the IGC code and its rules. guidelines incorporating IMO interim recommendations. In addition, a comprehensive safety assessment of CCS was conducted based on the results of the HAZID risk assessment, which led to the issuance of AiP.
The main CCS features announced by Kawasaki are as follows:
- Enables the transport of cryogenic liquefied hydrogen in large quantities thanks to a tank capacity comparable to that of tanks used on large LNG carriers
- Uses an independent, self-supporting design with a structure capable of responding flexibly to the thermal contraction that occurs when loading cryogenic liquefied hydrogen
- Features a new high performance thermal insulation system that dampens Evaporative Gases (BOGs) that occur in response to heat input
- Designed to efficiently use BOG as fuel to power the vessel, thereby helping to reduce CO2 emissions from liquefied hydrogen transport operations