Thermal insulation over coating is effective...most of the time, but on occasion when the coating iscompromised, a threat to the pipelines integrity can be realized due to corrosion under insulation (CUI).After a serious incident on the coast of Santa Barbara, CA in 2015, pipeline operators are required bylaw to act and address the threat of CUI with more frequent assessment intervals, confirmations, anda more stringent repair criterion (PHMSA’s advisory bulletin ADB-2016-04). To assist in determiningthe existence and the extent of this threat, in-line inspection (ILI) is recommended, but what is thebest ILI technology, tool type, and resolution for detecting CUI? Two case studies for guidance onselecting the proper ILI tool and data integration will be presented, the findings not only are applicableto CUI, but also to other forms of localized corrosion, such as microbiologically influenced corrosion(MIC). The results will surprise you!
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