Corrosion under insulation (CUI) is most often defined as a type of corrosion that results from moisture buildup on the external surfaces of piping and other equipment covered by insulation. CUI is most commonly classified as galvanic, chloridic, acidic, and/or alkaline in nature.
Carbon and low-alloy steels operating between –4°C (25°F) and +148°C (300°F) are most susceptible to CUI. CUI can be exacerbated in environments in which wet or damp insulation is in contact with carbon and low-alloy steel substrates at over 100°C (212°F.).
Most reports of CUI come from the chemical, refining, offshore, and marine industries. However, CUI is not exclusive to these industries, although it is often not recognized as being prevalent elsewhere.
This NACE International CorrCompliation provides the reader with a selection of papers on the subject of CUI; some are general in nature, and some discuss industry-specific issues. The papers have been divided into the following sections:
Section 1. General
The papers in Section 1 introduce the reader to the general characteristics, causes, and results of CUI.
Section 2. Inspection
The papers in Section 2 identify and discuss innovative inspection protocols and techniques that have been developed to identify and evaluate CUI.
Section 3. Chemical Processing and Petrochemical Refining
This section contains papers that focus on CUI in the refining and chemical-processing industries.
Section 4. Tanks and Vessels
This section focuses on CUI in aging petrochemical refinery pressure vessels.
Section 5. Offshore Oil and Gas Installations
The Section 5 papers discuss CUI identification and remediation at offshore oil and gas installations worldwide.
Section 6. Miscellaneous
The final section contains miscellaneous papers related to CUI.
312 pages, 8.5" x 11", spiral bound, 2017 by NACE.