Modeling of the Cryogenic Tank to Warehouse Liquefied Natural Gas (LNG) in the Event of the Earthquake

The main objective of this article is description of modeling of a cryogenic tank which is fitted for warehousing Liquefied Natural Gas in the event of earthquake. The tank consists of two other tanks: the inner steel tank and the external reinforced prestressed concrete tank. The model of the tank is made in the FEM program—ADINA. The designed structure is a shell structure where walls of the tank are designed as single layer elements and the bottom of the inner tank is designed as multi-layered element. The emphasis in the article is put on the work of the inner tank and the interaction of the tank with the warehoused liquid. Earthquake is an accidental action that is taken into account during the analysis. In the analysis a New Zealand earthquake signal was taken as an excitation signal. The analysis is executed in the time domain. Stress graphs, pressure graphs, displacements graphs maps of reduced stresses and yield stress graphs are shown in the article.