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Assessing the corrosion degradation of aboveground tank bottom plates is a critical challenge for the industry. Internal inspections are a useful way of assessing the integrity of assets but might severely impact normal plant operation. In 2006, Chang et al. conducted a study on storage tank accidents and concluded that 74% of reported accidents occurred in petrochemical refineries, and 85% of them had caused fire and explosions.
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According to the Petroleum Safety Authority (PSA) in Norway, corrosion under insulation (CUI) caused about 50% of all hydrocarbon leaks at onshore plants. In the case of Alberta’s oil sands, CUI has also been observed in thermal operations in above ground assets carrying emulsions, steam, hot water and/or warm water that are externally insulated to ensure safe and energy efficient operations. CUI has also been observed in oil sands mining operations in various piping systems and in tanks and vessels on structural supports and insulated support rings that are frequently in contact with soil or standing groundwater.