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10061 Ensuring the Accuracy of Indirect Inspections Data in the ECDA Process

Picture for 10061 Ensuring the Accuracy of Indirect Inspections Data in the ECDA Process
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Product Number: 51300-10061-SG
ISBN: 10061 2010 CP
Author: S.M. Segall, P. Eng. and John Shore, P. Eng.
Publication Date: 2010
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The quality of the indirect inspection data is a critical factor in conducting a successful ECDA program. New NACE standards (SP0207-20071 and TM 0109-092), improved instrumentation, experience sharing, and extensive training during the last several years, has resulted in a significant improvement in the accuracy of the survey data.

This paper covers a number of lessons learned by dealing with less-known sources of measurement error, during six years of ECDA application on more than 50 gas pipelines in Ontario.

Topics addressed include a discussion of errors:

• generated by rectifying elements in current interrupters,

• caused by the influence of remote rectifiers,

• introduced by local changes in soil resistivity during the DC Voltage Gradient Survey, and

• produced by transient currents during the Close Interval Potential Survey.

Keywords: ECDA, CIPS, DCVG, HVAC powerlines, influence survey, transient currents
The quality of the indirect inspection data is a critical factor in conducting a successful ECDA program. New NACE standards (SP0207-20071 and TM 0109-092), improved instrumentation, experience sharing, and extensive training during the last several years, has resulted in a significant improvement in the accuracy of the survey data.

This paper covers a number of lessons learned by dealing with less-known sources of measurement error, during six years of ECDA application on more than 50 gas pipelines in Ontario.

Topics addressed include a discussion of errors:

• generated by rectifying elements in current interrupters,

• caused by the influence of remote rectifiers,

• introduced by local changes in soil resistivity during the DC Voltage Gradient Survey, and

• produced by transient currents during the Close Interval Potential Survey.

Keywords: ECDA, CIPS, DCVG, HVAC powerlines, influence survey, transient currents
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11128 Interpretation of Indirect Inspections Data in the ECDA Process

Product Number: 51300-11128-SG
ISBN: 2011 11128 CP
Author: Sorin M. Segall, R. A. Gummow and John Shore
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51314-3815-Challenges in Analyzing ECDA Indirect Inspections Data

Product Number: 51314-3815-SG
ISBN: 3815 2014 CP
Author: Sorin Segall
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Improving the Quality of ECDA Indirect Inspection Data

Product Number: 51317--9038-SG
ISBN: 9038 2017 CP
Author: Sorin Segall
Publication Date: 2017
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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.
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