Abstract: Leakage occurred at the bottom of a vacuum residue tank in Tank Farm No.17 of a large refining and chemical company in central China. To clarify the causes of corrosion perforation at the tank bottom and adopt effective protection measures to reduce the risk of corrosion-induced leakage, this paper takes the bottom corrosion of vacuum residue tanks as the research object and elaborates on the mechanism and various causes for pitting corrosion and perforation at the tank bottom. Then it puts forward targeted protective countermeasures so as to improve the safe operation of storage tanks.

Key words: vacuum residue tank, tank bottom, corrosion, leakage, countermeasures