Abstract: According to the national and industrial standards and specifications, this paper classified, analyzed and judged the inspection results such as the problems of coating failure, local corrosion, internal floating roof seal failure, damage of anti-rotation device and liquid level gauge fixing device, and damage of tank accessories found in tank inspection. The causes for the three problems including corrosion, failure and damage found in the inspection were analyzed from three key links covering design, construction and operation management. Feasible treatment measures were formulated and repair was carried out item by item. The potential safety hazards were eliminated completely; the quality and efficiency of maintenance was improved. These ensured the timely operation of the tank and provided reference for the inspection and maintenance of other similar tanks.

Key words: refined oil storage tank, inspection and repair, case analysis, corrosion, failure