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Detection And Location Of Coating Defects And Disbondments On Buried Pipelines With Differential Reflectometry Mapping

Detection and Location of Coating Delamination and Anomalies on Buried Pipelines with Electromagnetic Reflectometry
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Corrosion control of buried assets usually involves a double shield: a coating system as a physical insulation barrier, and a cathodic protection system as an additional ad hoc defense. Detection of a corrosion spot at the coating defect stage is the only way to identify the threat before significant metal loss occurs. Furthermore, detection of defects in the coatings of such assets is especially important, since large defects, if left unrepaired, will not only leave the asset locally prone to corrosion, but also drain and weaken the cathodic protection effectiveness for the entire structure. Therefore, identification and characterization of coating anomalies is critical for the integrity of buried assets. 

Product Number: 51322-18065-SG
Author: Tristan Petit de Servins d’Héricourt, Homero Castaneda
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00

This paper covers a case study performed on 10-inch diameter steel pipelines in an urban environment to detect and locate coating anomalies (such as holidays and disbondment) with a novel technique and methodology. A survey tool and theoretical framework have been introduced, and the practical feasibility of wielding reflectometry of electromagnetic waves in buried steel pipelines to assess coating condition was trialed. The authors were able to model different reflectometry signatures obtained from different coating conditions. Differential Reflectometry Mapping (DRM) methods were found to be able to detect coating defects, including coating delaminations; and to accurately locate those defects at a distance of 1500 ft. This presents a clear progress for current state of the art capabilities in terms of remote coating assessment in buried pipelines while detecting disbondment conditions. DRM permits a unique improvement regarding integrity management for transmission and distribution of liquid assets. 

This paper covers a case study performed on 10-inch diameter steel pipelines in an urban environment to detect and locate coating anomalies (such as holidays and disbondment) with a novel technique and methodology. A survey tool and theoretical framework have been introduced, and the practical feasibility of wielding reflectometry of electromagnetic waves in buried steel pipelines to assess coating condition was trialed. The authors were able to model different reflectometry signatures obtained from different coating conditions. Differential Reflectometry Mapping (DRM) methods were found to be able to detect coating defects, including coating delaminations; and to accurately locate those defects at a distance of 1500 ft. This presents a clear progress for current state of the art capabilities in terms of remote coating assessment in buried pipelines while detecting disbondment conditions. DRM permits a unique improvement regarding integrity management for transmission and distribution of liquid assets. 

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