Address damage caused by galvanic corrosion.

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Authors: A. Anwer and N. Qureshi
Date: Jan. 2021
Publisher: Gulf Publishing Co.
Document Type: Article
Length: 859 words
Lexile Measure: 1400L

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At petrochemical and refining facilities, it is common for U-clamps over piping runs to become corroded, sometimes to the extent where they are completely thinned out. Localized thinning of supports can also happen, which may remain unnoticed. Fasteners lose their coating and a thin layer of rust appears that can potentially turn into something more significant that requires action.

These forms of galvanic corrosion can be observed externally with visual aids only. Slowly, these damages lead to the implementation of refurbishment projects to eliminate this form of corrosion. While notable cases exist where galvanic corrosion happens within process equipment, the focus here is the monitoring and elimination of those areas where galvanic corrosion happens externally and is often noticeable with visual aids only.

Galvanic corrosion can start where dissimilar metals are in contact without any precautions taken. One of the metals must be a noble-type; the other must be an active metal. While this contact can sometimes be avoided during the design stage, it is not always possible and designers may have many places onsite where a noble metal is in contact with an active metal. Another required element for galvanic corrosion is the presence of an electrolyte. Because this article is focused on the external areas that are vulnerable to galvanic corrosion, atmospheric...

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Gale Document Number: GALE|A674852861