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CUI Management Through Moisture Barrier System And Field Assessment

Product Number: 51321-16914-SG
Author: Ahmad Raza Khan Rana; Graham Brigham; Andrew Buchanan
Publication Date: 2021
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$20.00
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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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