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Coating Anomaly Detection with Integrated Indirect Inspection Tools

Assessment of the external coating condition of underground pipelines depend on the use of approved external corrosion direct assessment (ECDA) indirect inspection techniques such as alternating current voltage gradient (ACVG) alternating current attenuation (ACCA) and direct current voltage gradient (DCVG). Efficient application of these techniques (especially ACVG and DCVG) to ensure optimal detection and prioritization of coating anomalies largely depend on a myriad of factors including: depth of cover probe spacing current level and soil resistivity.Research and industry experience have shown that normalization of key factors such as current level probe spacing and depth of cover led to accurate detection and prioritization of coating anomalies for ECDA and coating assessment projects. However there have been scenarios where known coating faults have not been detected with DCVG and ACVG even when key factors were considered during the indirect inspection.This paper will present case studies that showcase instances where the optimization of coating anomaly detection and prioritization methodologies led to a successful execution on ECDA projects and prevented unnecessary pipe bell-hole excavations. In addition lessons learned from scenarios where known coating faults were not detected with voltage gradient surveys will be presented.Key Words: Pipeline Integrity ACVG DCVG ACCA Cathodic Protection Indirect Inspection ECDA Pipeline Integrity Management Program.

Product Number: 51319-12810-SG
Author: Chukwuma Onuoha
Publication Date: 2019
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$20.00
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