 Corrosion under insulation

Corrosion under insulation (CUI) is a type of corrosion that occurs on the surface of metal components that are insulated, typically in industrial settings. This phenomenon is particularly common in process plants, refineries, and chemical processing facilities where piping, valves, and other equipment are insulated to maintain temperature, save energy, or protect personnel from hot surfaces. ### Key Points about CUI: 1. **Causes**: CUI generally occurs due to moisture trapped under the insulation material.