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Improvements in the Use of Indirect Inspection Tools and Data Interpretation

Published: 20180416 by NACE Corrsion
Author(s): Sorin Segall
Co-Author(s): R. A. Gummow. P.Eng - Corrosion Service; Daniel Fingas, P.Eng - Corrosion Service; Cory Bradshaw, P.Eng - TransCanada Pipelines

This paper covers various methods for dealing with sources of errors affecting the accuracy of the Direct Current Voltage Gradient (DCVG) coating defect identification and sizing tool. Topics reviewed in detail include: eliminating the influence of local soil resistivity and varying pipe depth on the calculation of the %IR severity ranking index and using the DCVG in conjunction with an AC Current Attenuation (ACCA) survey.