Coatings are the primary means for imparting corrosion protection to gas and liquid pipelines. Though cathodic protection is also often applied, if no coating was present the demand for supplied current to effectively catholically protect the pipe would be cost-prohibitive. Because coatings are the main line of defense, understanding how they disbond from the pipe and lead to defects and flaws which in turn could result in subsequent corrosion is important. The objective of this project was to identify the conditions promoting coating disbondment during in-service exposure. A set of variables including coating chemistry, surface chemistry, surface roughness, anchor pattern, coating underside chemistry, and optical analysis was investigated and the critical parameters leading to disbondment evaluated. Developing a better understanding of the coating disbondment process, especially concerning the initial stages of coating degradation, gained during the project will serve as a stepping stone for developing a field-based methodology to predict long-term coating performance and to identify the onset of disbondment.
The overall objective was to determine the accuracy, resolution, and limitations of equipment typically used for modern aboveground ECDA work with res...
This report details the development and testing of a dual magnetization in-line inspection (ILI) tool for detecting mechanical damage in operating pip...
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United States Department of Transportation
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