Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.
Corrosion under Insulation (CUI) and External Corrosion continue to be a major issue for Petrochemical facilities. Refineries have been investing in a CUI and External Corrosion inspection program. This paper details the methodology for addressing this damage and lessons learned throughout the implementation.
Investigation and comparison of effects of mineral wool and a water repellent insulation on CUI. Drain holes and their ability to reduce CUI was evaluated. The susceptibility to CUI of carbon steel was investigated at 80 °C using a newly developed test rig in a controlled environment (25 °C and 50 %RH).