Water in the insulation, either because of improper storage before installation, improper installation, or damage after installation. This may be compounded if there is corrosive chemical contamination of water soaked into the insulation – for example, acids and other process chemicals, or chlorides such as salt from the air near salt water or from de-icing chemicals.
Water or other fluids can flow through certain types of insulation and move away from the source of the leak. CUI may occur in areas farther from the leak than expected –especially in low spots.
Pinholes or small process leaks from gaskets and fittings underneath insulation, which may remain undetected until the damage causes a larger leak.
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