Analysis of Temperature Distribution and Variation in Inground LNG Storage Tank under Long Term Operation

In-ground type LNG storage tank is constructed below the ground level except its roof, and has a slurry wall bearing soil and water pressure to store LNG in safe condition. During the long term operation, soil freezing occurs around the in-ground storage tank despite the insulation provided inside of the concrete tank due to the cryogenic temperature of LNG. This study compares the result of FE analysis and measured data to investigate the temperature distribution and variation in and outside the LNG tank. In order to validate the design documents, boundary conditions and material properties for FE analysis have been taken from the design documents for tank construction. The comparative observation between analyses and measurements has revealed that the temperature variation of concrete structure and soil is predictable and the results are applicable to designing the in-ground storage tank.