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Improving the Quality of ECDA Indirect Inspection Data

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The quality of indirect inspection data is critical in an External Corrosion Direct Assessment (ECDA).  The need exists to increase the accuracy of the field data collection, to improve the data processing and to effectively present the results. This paper describes several challenges.

Product Number: 51317--9038-SG
ISBN: 9038 2017 CP
Author: Sorin Segall
Publication Date: 2017
Industry: Corrosion Monitoring and Control
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The quality of the indirect inspection data is a critical factor in conducting a successful ECDA. It is therefore essential to increase the accuracy of the field data collection to improve the data processing and to effectively present the results. This paper describes several challenges faced during this continuous improvement process.Techniques for obtaining accurate field data for assessing the risk of AC corrosion are reviewed.Data processing considerations are presented in the context of a case of third-party damage. The implications for similar DCVG indications on the same line are discussed and a mechanism for these “apparent” DCVG indications is presented.A new format for displaying the data is also presented allowing a better visual co-ordination between the indications and the site features as well as allowing immediate assessment of the proposed locations for direct examinations in terms of access and other challenges.

Keywords: External Corrosion, Direct Assessment, (ECDA), Close Interval Potential Survey, (CIPS), Direct Current Voltage Gradient (DCVG), AC corrosion, DC interference, DCVG indications.

The quality of the indirect inspection data is a critical factor in conducting a successful ECDA. It is therefore essential to increase the accuracy of the field data collection to improve the data processing and to effectively present the results. This paper describes several challenges faced during this continuous improvement process.Techniques for obtaining accurate field data for assessing the risk of AC corrosion are reviewed.Data processing considerations are presented in the context of a case of third-party damage. The implications for similar DCVG indications on the same line are discussed and a mechanism for these “apparent” DCVG indications is presented.A new format for displaying the data is also presented allowing a better visual co-ordination between the indications and the site features as well as allowing immediate assessment of the proposed locations for direct examinations in terms of access and other challenges.

Keywords: External Corrosion, Direct Assessment, (ECDA), Close Interval Potential Survey, (CIPS), Direct Current Voltage Gradient (DCVG), AC corrosion, DC interference, DCVG indications.

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