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Soil-side corrosion of the bottom plates of aboveground storage tanks is the main cause of tank failure. A case study is discussed in this paper, in which failures of three storage tanks were investigated. Soil analysis revealed high salt content and low resistivity.
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Oil storage tanks experienced accelerated corrosion from the soil side. The short term strategy adopted was to drill under the tanks and inject vapor phase corrosion inhibitors to extend the tank floor life in a risk-rated phased effort for the 48 tanks.
Soil-side corrosion of the bottom plates of aboveground storage tanks is one of the main reasons for the tank bottom failures. Literature data and experimental work have shown that soil-side corrosion rates could reach as high as 50-100 mpy, indicating that soil-side corrosion could cause the tank-bottom failure in relative short periods, i.e., less than five years after initial installation or repairs. In addition, a recent study has shown that cathodic protection (CP) systems’ effectiveness could be questionable in up to 40 percent of the tanks.
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.