Inspection
Work Planning
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A corrosion mechanism that occurs beneath thermal insulation or fireproofing where moisture becomes trapped against equipment surfaces.
Corrosion Under Insulation (CUI) is a degradation mechanism in which external corrosion develops beneath thermal insulation, weatherproofing or fireproofing due to the presence of trapped moisture. CUI is one of the most significant external corrosion mechanisms affecting insulated piping and pressure equipment because deterioration often remains hidden until extensive damage has occurred.
CUI represents a major integrity threat because corrosion can progress undetected, increasing the likelihood of leaks, failures and costly repairs.
Managing CUI typically involves risk assessment, targeted inspections, insulation condition monitoring, moisture control, protective coatings and replacement of damaged insulation systems.
Corrosion Under Insulation is a specific corrosion mechanism and should not be confused with general atmospheric corrosion or internal process corrosion.
Mechanical Integrity; Corrosion; Inspection & NDT; Reliability Engineering.
Risk-Based Inspection.; External corrosion inspections.; Remaining life assessments.; Integrity management.; Maintenance planning.
API RP 583; API RP 581
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