Corrosion Under Insulation (CUI) is a notorious, costly, and insidious problem in the oil, gas, chemical, and petrochemical industries. It occurs when water infiltrates the insulation on piping and equipment, causing severe corrosion, often unseen, until a failure occurs. The (now often managed under AMPP) standard, Control of Corrosion Under Thermal Insulation and Fireproofing Materials , is the premier industry guidance for tackling this challenge.
The standard identifies three mandatory conditions required for CUI to occur: nace sp0198 pdf
CUI is a pervasive issue where moisture becomes trapped between insulation and the metal surface, leading to severe localized corrosion that is often hidden from view. NACE SP0198 addresses this by adopting a , integrating five critical areas of control: Corrosion Under Insulation (CUI) is a notorious, costly,
Refineries use coatings like Mascoat 450EN and AkzoNobel 1202 UPC, which meet SP0198 requirements for high‑temperature CUI protection. It is dangerous because insulation hides the corrosion,
CUI is a leading cause of maintenance expense and equipment failure. It is dangerous because insulation hides the corrosion, making it impossible to see until leaks happen.
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