BUCKLING PRESSURE IN DOUBLE WALL CRYOGENIC STORAGE TANK BY FEM

It is desired to calculate the critical buckling pressure in double wall cryogenic storage tank. These storage tanks are usually composed of two separated walls in which the inner wall is responsible to store the cryogenic liquid. The space between two walls should be filled by loose perlite to minimize heat transfer from ambient. So, it is expected to expose an external pressure more than vapor pressure on inner tank wall. The results show that the accuracy of analytical equations is not acceptable and should be revised. So, in this study, new correlations were proposed based on numerical results obtained by Ansys.