Abstract: LNG tank is important equipment in receiving station. With the accumulation of running time and the change of operating state, the cooling effect of LNG tank will be reduced to varying degrees. This paper introduces the working principles, equipment selection, testing steps and evaluation criteria of infrared thermal imaging on-line detection. Combining with the example of infrared imaging inspection of LNG tank surface, it makes an overall assessment on the cooling effect of the storage tank and confirms the cooling state, which provides technical guarantee for the safe and stable operation of storage tank. Meanwhile, the paper provides scientific reference basis for the cold storage recovery operation of storage tank. It also provides better management ideas for the construction and integrity management of LNG storage tanks at other receiving stations.

Key words: LNG storage tank, Insulation, infrared thermal imaging, pearlite