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Aboveground Storage Tanks (AST) degradation is mainly caused by bottoms corrosion. The paper includes a case study, where historical inspection records of more than sixty (60) AST with different hydrocarbon fluid services and bottoms corrosion control systems were reviewed and analyzed.
Aboveground Storage Tanks (AST) degradation is mainly caused by bottoms corrosion which occurs on bottoms product-side and soil-side as a result from the interaction between the steel and the surrounding environments . Different corrosion control and mitigation measures have been deployed to minimize the corrosion damage and subsequently increase tanks reliability and integrity. This paper evaluated the effectiveness of different applied AST bottoms corrosion control systems. The paper includes a case study where historical inspection records of more than fifty (50) AST with different hydrocarbon fluid services and bottoms corrosion control systems are reviewed and analyzed. The study reveals that applied product-side corrosion control systems were effective whereas examined solid-side corrosion control systems shared similar shortcomings. In addition the analysis results were discussed against inspection requirements of two internationally adopted AST inspection codes namely American Petroleum Institute API standards 653 and Equipment Engineering Material Users Association EEMUA Publication No. 159.
Key words: AST Bottom Integrity, Cathodic Protection (CP), AST Coating, AST Bottom Corrosion Control
The above ground storage tanks in the refinery are experiencing bottom plate underside (soil) corrosion at a high rate of 1mm/year. Results: Failure of 4 tanks within a period of 9 years. Observations, details of the CP survey, tests, results and forward path taken up.
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Case study for anode grid systems. used for Cathodic Protection of above ground storage tank bottom plates. Technical solutions for arranging the anode grid on large (90 m diameter) tanks are studied and compared in respect to the CP major objective.