Corrosion Under Insulation (CUI)

What this topic covers

Why insulated equipment can hide external corrosion and complicate inspection.

Core ideas

Moisture can enter insulation systems through weathering, damaged cladding or penetrations.

External surfaces may remain hidden until insulation is removed or suitable screening methods are used.

Inspection planning considers environment, temperature range, insulation condition and consequence.

Program tradeoffs

Localized damage can make simple averages misleading, so engineering decisions need representative evidence and applicable acceptance criteria.

What good evidence looks like

Repairs, pressure testing, entry and live process work are specialized activities outside this site's procedural scope.

Lifecycle perspective

Trend tools here illustrate data behaviour only and never establish safe remaining life or retirement limits.