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

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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
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$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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Picture for 03029 STRATEGIES TO PREVENT CORROSION UNDER
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03029 STRATEGIES TO PREVENT CORROSION UNDER INSULATION IN PETROCHEMICAL INDUSTRY PIPING

Product Number: 51300-03029-SG
ISBN: 03029 2003 CP
Author: Brian J. Fitzgerald, Peter Lazar III, Robert M Kay, Stefan Winnik
Publication Date: 2003
$20.00

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.
Picture for Factors for Selecting Thermal Insulation Materials to Prevent Corrosion Under Insulation
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Factors for Selecting Thermal Insulation Materials to Prevent Corrosion Under Insulation

Product Number: 51319-12952-SG
Author: Kentaro Mizushima
Publication Date: 2019
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Many types of thermal insulation materials are used in oil and gas plant facilities. Recently new materials have been developed to prevent corrosion under insulation (CUI) and even the conventional materials have been improved their properties to provide better protection.When designing a plant measures to prevent CUI are studied when verifying the materials of construction determining the protective coatings systems and selecting thermal insulation and jacketing materials. Measures to prevent CUI should not be considered separately for these but rather together as a total system. Recently though while protective coatings have been studied by users coating manufacturers and independent organizations such as testing laboratories engineering firms and consultants there has been little investigation of the ability of thermal insulation materials themselves to prevent CUI.In this study the ability of various thermal insulation materials to prevent CUI in a simulated severely corrosive environment were examined. The factors influencing CUI prevention or aggravation were identified based on which it was recommended that these factors be considered when selecting thermal insulation materials during the design of a plant. As a summary of this study experiences of design of plants and related other CUI studies effective ideas relating to protective coatings thermal insulation and jacketing materials for preventing CUI will be shared.
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THE INFLUENCE OF INSULATION MATERIALS ON CORROSION UNDER INSULATION

Product Number: MPWT19-15362
Author: John Williams, Owen Evans
Publication Date: 2019
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The designer of industrial equipment and piping has three weapons in the fight against corrosion
under insulation (CUI). The first and primary defense against CUI is a high quality, immersion
grade coating. The second is a properly designed and installed weather barrier jacketing. The third
and, arguably, least understood element is the choice of insulation material. This paper will explore
the ways in which insulation materials influence CUI behavior, presenting results from both
laboratory and field-testing on seven industrial insulation materials and one composite system.
The materials tested were calcium silicate, expanded perlite, cellular glass, mineral wool (both
regular and water-repellent grade), and two types of flexible aerogel blanket material -Pyrogel
XT and Cryogel Z
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