Corrosion under insulation (CUI) is a form of external corrosion that can be widespread or localized, caused by trapped water/moisture on surfaces covered with insulation. Because these surfaces are not generally available/accessible for visual examination, the onset of corrosion cannot be easily identified, and in extreme cases, severe corrosion with consequential impairment of system integrity can occur. Furthermore, CUI is a prevalent industry problem affecting thermally insulated equipment in the onshore and offshore oil and gas industries, as well as the petrochemical, specialty chemical, fertilizer, and related industries.
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