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CUI Management Through Moisture Barrier System And Field Assessment

Picture for CUI Management Through Moisture Barrier System And Field Assessment
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Product Number: 51321-16914-SG
Author: Ahmad Raza Khan Rana; Graham Brigham; Andrew Buchanan
Publication Date: 2021
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CUI (Corrosion Under Insulation) is a key degradation in plant assets and contributes 40% - 60% failures
in the piping systems. CUI is known to trigger from soaked insulation that are held in-contact with the
metal(s). This article presents a case study of moisture management where a hydrocarbon operator faced
challenge of frequent soaking of thermal insulations that caused the operator to replace the entire
insulation on a multi-kilometer pipeline twice within an operating period of 10 years. The newer insulation
was installed with and without various combinations of moisture barrier devices. The various moisture
barrier devices included low point drains, ventilation windows, as well as standoffs between insulation
and jacketing. The assessment was made via monitoring of moisture content (Vol.%) in the insulation for
which moisture readings were taken at the pipe's surface as well as alongside the thickness of insulation
on a bi-weekly basis over a period of 7 months. The standoffs between jacketing and insulation
significantly reduced the moisture content of the entire insulated system. This article also addresses the
modular management via termination gaskets for compartmentalization and assessment of trapped
moisture within any insulated system.

CUI (Corrosion Under Insulation) is a key degradation in plant assets and contributes 40% - 60% failures
in the piping systems. CUI is known to trigger from soaked insulation that are held in-contact with the
metal(s). This article presents a case study of moisture management where a hydrocarbon operator faced
challenge of frequent soaking of thermal insulations that caused the operator to replace the entire
insulation on a multi-kilometer pipeline twice within an operating period of 10 years. The newer insulation
was installed with and without various combinations of moisture barrier devices. The various moisture
barrier devices included low point drains, ventilation windows, as well as standoffs between insulation
and jacketing. The assessment was made via monitoring of moisture content (Vol.%) in the insulation for
which moisture readings were taken at the pipe's surface as well as alongside the thickness of insulation
on a bi-weekly basis over a period of 7 months. The standoffs between jacketing and insulation
significantly reduced the moisture content of the entire insulated system. This article also addresses the
modular management via termination gaskets for compartmentalization and assessment of trapped
moisture within any insulated system.

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Picture for Corrosion Scale And Moisture Assessments – An Improvement To On-Stream Inspections For CUI Management
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Corrosion Scale And Moisture Assessments – An Improvement To On-Stream Inspections For CUI Management

Product Number: 51323-19167-SG
Author: Ahmad Raza Khan Rana, Graham Brigham, Omar Chaar, Syed Umair Niaz Bukhari
Publication Date: 2023
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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.
Picture for CUI Mechanism and Prevention
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51315-5757-CUI Mechanism and Prevention

Product Number: 51315-5757-SG
ISBN: 5757 2015 CP
Author: Hiroyasu Matsuda
Publication Date: 2015
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Picture for Lessons Learned from Development of a CUI Coating
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51316-7831-Lessons Learned from Development of a CUI Coating

Product Number: 51316-7831-SG
ISBN: 7831 2016 CP
Author: James McDonald
Publication Date: 2016
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