This paper describes a methodology for assessing and addressing Corrosion Under Insulation (CUI)
with respect to refinery pressure vessels. It has been of particular concern in managing the integrity of
aging refinery pressure vessels where internal corrosion is not life limiting. Inspection methods and
field experience with these methods are discussed. Options for corrosion mitigation are discussed in
detail. Review of organic coatings, and metallic sprays such as thermal spray aluminum (TSA) is
attempted. The paper provides a number of successful and unsucessful case histories of vessel CUI
mitigation by field applied coatings. Success factors for coatings applications under field conditions are
also highlighted.