Optimization of the Coating Anomaly Detection and Prioritization Methodology Using Voltage Gradient Surveys

摘要

The assessment of the external coating condition of underground pipelines relies mainly on the use ofindirect inspection techniques such as alternating current voltage gradient (ACVG) and direct currentvoltage gradient (DCVG). Although these techniques have been in practical uses for decades now,their efficient application for the optimal detection and prioritization of coating anomalies depend largelyon factors which have thus far been ignored. The resultant consequences have been severe, includingwasted financial resources due to unnecessary pipe bell-hole excavation, and the possibility of futurecorrosion damages to the exposed pipe sections. In this paper, we address these important factors,and incorporate them into a general model for the optimal detection and prioritization of the coatinganomalies using ACVG and DCVG techniques.