September 2021

Maintenance and Reliability

Corrosion under insulation on stainless steel

Corrosion under insulation (CUI) is a severe form of localized external corrosion that occurs on stainless steel (SS) that has been insulated.

Rupesh, S., Independent Consultant

Corrosion under insulation (CUI) is a severe form of localized external corrosion that occurs on stainless steel (SS) that has been insulated. It is a costly problem in the process, chemical and pharmaceutical industries, with millions of dollars spent on inspection and repair of equipment over the past several years. Although CUI is common in carbon steel, it also affects SS, which is otherwise considered corrosion resistant. This corrosion manifests in the form of severe pitting. The main reasons for CUI occurrence in SS are the presence of chlorides and fluoride ions in insulation, the presence of an electrolyte (mainly water) and the presence of oxygen. Sometimes, the presence of acids

Log in to view this article.

Not Yet A Subscriber? Here are Your Options.

1) Start a FREE TRIAL SUBSCRIPTION and gain access to all articles in the current issue of Hydrocarbon Processing magazine.

2) SUBSCRIBE to Hydrocarbon Processing magazine in print or digital format and gain ACCESS to the current issue as well as to 3 articles from the HP archives per month. $409 for an annual subscription*.

3) Start a FULL ACCESS PLAN SUBSCRIPTION and regain ACCESS to this article, the current issue, all past issues in the HP Archive, the HP Process Handbooks, HP Market Data, and more. $1,995 for an annual subscription.  For information about group rates or multi-year terms, contact J'Nette Davis-Nichols at Jnette.Davis-Nichols@GulfEnergyInfo.com or +1 713.520.4426*.

*Access will be granted the next business day.

Related Articles

From the Archive

Comments

Comments

{{ error }}
{{ comment.comment.Name }} • {{ comment.timeAgo }}
{{ comment.comment.Text }}