How do you design to prevent corrosion under insulation (CUI)?

CUI prevention design: Material selection - use corrosion-resistant alloys for susceptible temperature ranges (0-175C for carbon steel under insulation). Coating - thermal spray aluminum (TSA), epoxy-phenolic coatings under insulation. Insulation selection - closed cell (foam glass) prevents water ingress better than open cell. Weather barrier - high integrity jacketing, proper sealing at terminations and penetrations. Design details - avoid water traps, slope horizontal runs, seal penetrations. Drainage - provide weep holes at low points. Inspection accessibility - removable cladding sections at high-risk locations. Temperature screening - identify equipment in CUI temperature range for enhanced protection. Process side considerations - intermittent operation increases risk (thermal cycling). Inspection program - use thermography, neutron backscatter, or targeted insulation removal for monitoring.