Finite Element Simulation of Inner Tank of LNG Full Capacity Storage Tank

The inner tank of LNG storage tank is an important part of LNG storage tank, and its mechanical characteristics are very important to the safety of engineering operation and maintenance. Considering the high price of the inner tank material (9% Ni steel plate), it is difficult to practically carry out large-scale or equal-scale experimental research in batches. Therefore, using finite element software to conduct research on the LNG inner tank can not only obtain reliable results, but also save a lot of cost. In this paper, the design and calculation of the wall thickness of the inner tank are first carried out, and on this basis, the numerical model of the designed 200,000 m3 full-capacity storage tank is established by using the finite element software ANSYS, and then the water pressure condition and the maximum operating conditions are simulated and calculated. Liquid level conditions, external pressure buckling conditions. The research results show that the maximum stress is located at the bottom of the inner tank and is less than the allowable stress un-der the condition of hydraulic pressure and maximum operating liquid level; buckling occurs at the bottom of the inner tank under the condition of external pressure buckling.