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Corrosion Under Insulation Behavior of Out-Of-Service Carbon Steel Pipes With And Without Non-Metallic Stand-Off Membranes

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.

Product Number: 51323-19355-SG
Author: Ahmad Raza Khan Rana, George Jarjoura, Graham Brigham, Omar Chaar
Publication Date: 2023
$20.00
$20.00
$20.00

CUI (corrosion under insulation) refers to the external corrosion on thermally insulated metals which mainly manifests as localized corrosion. The key driver behind the CUI is the soaked thermal insulation which results in both uniform and localized corrosion. There are many instances where the facility piping, and pipelines undergo flooding and submerging conditions which result in the soaking of insulation. The issue gets aggravated (i.e., prolonged soaking) for the pipes/ pipelines which are either mothballed or operate at or near the ambient temperatures. This study addresses the long-term CUI behavior of pipe assemblies applied with and without non-metallic stand-off membranes. The assemblies were submerged in water for 2 days followed by outdoor exposure for 01 year. The assemblies were tested for CUI behaviors via weight loss method and various characterization methods namely confocal laser topography and scanning electron microscopy.

CUI (corrosion under insulation) refers to the external corrosion on thermally insulated metals which mainly manifests as localized corrosion. The key driver behind the CUI is the soaked thermal insulation which results in both uniform and localized corrosion. There are many instances where the facility piping, and pipelines undergo flooding and submerging conditions which result in the soaking of insulation. The issue gets aggravated (i.e., prolonged soaking) for the pipes/ pipelines which are either mothballed or operate at or near the ambient temperatures. This study addresses the long-term CUI behavior of pipe assemblies applied with and without non-metallic stand-off membranes. The assemblies were submerged in water for 2 days followed by outdoor exposure for 01 year. The assemblies were tested for CUI behaviors via weight loss method and various characterization methods namely confocal laser topography and scanning electron microscopy.

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