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Corrosion under insulation (CUI) is among the key damage mechanisms in the hydrocarbon industry which mainly manifests localized corrosion on thermally insulated equipment, tanks, piping, and pipelines. CUI is a highly frequent degradation in the oil refining facilities where reportedly 40-60% of failures in the piping result from CUI. In addition, small bore piping (i.e., nominal pipe size, NPS < 4 inch. or 100 mm) are even more prone to CUI and reportedly up to 81% of failures in these piping caused by CUI.
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Corrosion Under Insulation (CUI) is the corrosion of piping or equipment under insulation that occurs when moisture ingresses the interface between insulation and piping or equipment, helping to form corrosion cells. CUI is one of the costliest problems shared by the oil and gas industries. One reason this problem has been a perennial challenge is that CUI is difficult to detect because it occurs under the insulation. And since it occurs regardless of the type of fluid in the pipe, every part of the plant would be included in the monitoring scope.
Corrosion under insulation (CUI) is a widespread corrosion phenomenon in many industries since it was first described in 1965. CUI generally occurs when moisture is retained within thermal insulation and metal interface and when the protective coating breaks down. Improper installation and eventual damage to metal jacketing act as an entry point for water. The rate of CUI can be further accelerated depending on the amount of leached corrosive species and the operating parameters.
Corrosion under insulation (CUI) is corrosion that results from moisture buildup on equipment covered by insulation. CUI is commonly classified as galvanic, chloridic, acidic, and/or alkaline in nature. CUI is widespread. 2017 NACE E-book
CUI (Corrosion under insulation) is among the key damage mechanisms in the process and hydrocarbon industries which results in the localized corrosion (mainly) thereby reducing the service life of the assets (pipes, equipment, etc.) CUI is reportedly known as the reason behind 40-60% of failures in the facility piping whereas small bore piping (i.e., NPS< 4”) are even more sensitive to CUI failures, where up to 81% of reported failures in small-sized piping are known to be from CUI. Monetary spending to inspect and fix CUI-related failures cost 10% of overall maintenance budget in a typical medium-sized oil refinery. CUI risk is influenced by numerous operational and environmental factors which impedes its management in a typical AIM (Asset integrity management) program.
External corrosion in uninsulated pipelines is normally able to be prevented by cathodic protection (CP). Generally, external corrosion on buried pipelines cannot occur if CP current is getting onto the pipe. CP is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode (pipe) in the same cell. For instance, to make a pipeline a cathode, an anode is attached to it.
CUI (Corrosion under insulation) is among the key damage mechanisms affecting the integrity of equipment, piping, and pipelines in the hydrocarbon industry. CUI manifests (mostly) localized corrosion. CUI is a highly frequent degradation in the oil refining facilities where reportedly 40-60% of failures in the piping result from CUI.
CUI (Corrosion under insulation) refers to localized corrosion under thermal insulations, which pose integrity risks to the hydrocarbon facilities. 1 CUI is reportedly a driver behind 40-60% of failures in the facility piping. Smaller-sized piping (i.e., diameter < 4”) are even more prone to CUI, whereas reportedly 81% of failures in small-sized piping are due to CUI. 2 CUI-related failures and associated efforts comprise 10% of a facility’s maintenance budget. Management of CUI risks has always been challenging as it involves maneuvering numerous governing factors. The key driving factor behind CUI is the aerated moisture that comes from soaked thermal insulations.
Corrosion under thermal insulations namely CUI (Corrosion under insulation) is among the key damage mechanisms which poses integrity risk to the hydrocarbon facilities. CUI is reportedly known as the reason behind 40-60% of failures in the facility piping whereas small bore piping (i.e., NPS < 4”) are even more sensitive to CUI failures, where up to 81% of reported failures in small-sized piping are known to be from CUI. Monetary spending to inspect and fix CUI-related failures cost 10% of overall maintenance budget in a typical medium-sized oil refinery. CUI risk is influenced by numerous operational and environmental factors which impedes its management in a typical AIM (Asset integrity management) program.