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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.
Corrosion under Insulation (CUI) and External Corrosion continue to be a major issue for all Petrochemical facilities throughout the world. Over many years, refineries and petrochemical plants have experienced extensive damage due to these mechanisms. As a result, several of the company refineries have been investing in a CUI and External Corrosion inspection program. This paper details the methodology used by two refineries for addressing this damage and lessons learned throughout the implementation.
Keywords: Refining, Corrosion under Insulation, External Corrosion.
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.
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Since 2002, a corrosion inhibiting chemistry package has been an integral part of two specific industrial insulations. This paper explains, at a molecular level, how this package engages a two-pronged defense (physical coating and pH buffering) against CUI.