scope:

This document specifies general inspection and test requirements for liquid hydrogen cargo tanks on board a hydrogen carrier ship. In case of liquefied hydrogen containment system, the testing activity depends strictly on the type of storage technology identified by the IGC code. This document is applicable to Type C independent metallic double wall type tanks with vacuum insulation having a capacity not more than 1 000 ㎥. It is also applicable to liquid hydrogen cargo tanks which are designed to transport pure para-hydrogen (not less than 95 % content).

Note 1 Annex A gives a general considerations for the liquid hydrogen storage system since liquefied hydrogen has danger characteristics such as low ignition energy, a wide range of flammability limits, low visibility of flames in case of fire, and high flame velocity, which may lead to detonation with shockwave, low temperature and liquefaction or solidification of inert gas and constituents of air which may result in an oxygen-enriched atmosphere, high permeability, low viscosity, hydrogen embrittlement including weld metals.