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Recent close-interval potential surveys have raised concerns about the accuracy of potential measurements on older, poorly-coated pipelines. Two sources of error were identified: metallic IR-drops and equalization currents.
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It was proposed to apply a modified external corrosion direct assessment process to a small station. This paper describes the technical approach which was developed in order to overcome the expected challenges.
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.
Assessment of a 70-year old pipeline is carried out. This paper discusses the assessment challenges, inspection findings and recommendations given to keep this old offshore/onshore unpigable giant in service.
This paper summarizes the results of ten years of External Corrosion Direct Assessment (ECDA) application on more than 100 projects and includes a number of important lessons learned during the process.
NACE external corrosion direct assessment (ECDA) process — assessing and reducing the impact of external corrosion on pipeline integrity.