ABSTRACT
Type C storage tanks are typical double wall cryogenic pressure vessels consisting of an inner and an outer shell with void annular space between the shells. The purpose of the void between internal and external shell is to provide the required insulation, reducing the thermal flux from the environment to the LNG stored within the inner tank. In addition, the external shell acts as a second barrier in case of leakage thus limiting the possibility of an accidental release to the environment. Common type ‘C’ tanks consist of a cylindrical shell closed at its ends with semi-ellipsoidal, torispherical or hemispherical unstayed heads, dished from plates.
