In recent years, pipeline leaks in the energy and infrastructure sectors have mandated asset owners to implement more regulated inspection regimes. NACE SP05021  – Pipeline External Corrosion Direct Assessment (ECDA) Methodology was created as a guide to apply the ECDA process and mitigate external corrosion on typical pipeline systems. The collection of reliable and practicable field data is crucial in the success of an ECDA process. Techniques and guidelines to obtain quality data in the field across the indirect inspection processes are presented. Some of the datasets discussed include Close Interval Potential Survey (CIPS) data, Direct Current Voltage Gradient (DCVG) data, soil resistivity data, AC induced corrosion data and pipeline interference data. Continued diligence of the surveying field personnel, as well as adherence to guidelines, will eventually save pipeline owners unnecessary excavation costs while also ensuring locations at the highest risk of external corrosion are rehabilitated and repaired as part of the direct examination.

Subject
Electric current, Indirect inspection, External corrosion direct assessment, Voltage, Reference electrodes, Pipelines, Soil resistivity, Coating surveys, Personnel, Corrosion data, Cathodic protection survey, Coating defects, Surveys
Keywords:
Corrosion Monitoring, Corrosion Potential, Cathodic Protection, Indirect Inspection, Direct Assessment, ECDA, Coating Defect, Condition Assessment
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2022
Association for Materials Protection and Performance (AMPP)
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