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11128 Interpretation of Indirect Inspections Data in the ECDA Process

Picture for 11128 Interpretation of Indirect Inspections Data in the ECDA Process
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Product Number: 51300-11128-SG
ISBN: 2011 11128 CP
Author: Sorin M. Segall, R. A. Gummow and John Shore
Publication Date: 2011
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The interpretation of the indirect inspection data is a critical factor in conducting a successful ECDA process. The data must be validated, discrepancies must be resolved, and indications must be identified, classified and prioritized, in order to select the sites for direct examinations.

This paper analyzes the various types of data provided by the indirect inspection tools and especially their interrelation. Additional types of indications related to AC and DC interference are also discussed. “Threat related” classification and prioritization criteria, as successfully applied on more than 50 gas pipelines in Ontario, are presented and rationalized. Possible error scenarios resulting from neglecting the interaction between various types of indications are developed from existing sets of data.

Keywords: External corrosion direct assessment, ECDA, close-interval potential survey, CIPS, closeinterval survey, CIS, DC voltage gradient, DCVG, AC voltage gradient, ACVG, AC interference, ACenhanced corrosion, ACEC, DC interference, DCI.
The interpretation of the indirect inspection data is a critical factor in conducting a successful ECDA process. The data must be validated, discrepancies must be resolved, and indications must be identified, classified and prioritized, in order to select the sites for direct examinations.

This paper analyzes the various types of data provided by the indirect inspection tools and especially their interrelation. Additional types of indications related to AC and DC interference are also discussed. “Threat related” classification and prioritization criteria, as successfully applied on more than 50 gas pipelines in Ontario, are presented and rationalized. Possible error scenarios resulting from neglecting the interaction between various types of indications are developed from existing sets of data.

Keywords: External corrosion direct assessment, ECDA, close-interval potential survey, CIPS, closeinterval survey, CIS, DC voltage gradient, DCVG, AC voltage gradient, ACVG, AC interference, ACenhanced corrosion, ACEC, DC interference, DCI.
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