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Interpretation and Selection of Direct Examination Locations with Respect to ECDA Methodology

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This paper presents advances in the interpretation of indirect inspection data and selection of ECDA direct examination locations and how the accurate selection of locations most susceptible to external corrosion would improve pipeline integrity.

Product Number: 51317--9304-SG
ISBN: 9304 2017 CP
Author: Chukwuma Onuoha
Publication Date: 2017
Industries: Pipelines, Tanks, and Underground Systems , Corrosion Monitoring and Control
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Interpretation of indirect inspection data and selection of direct examination locations are crucial steps in conducting successful external corrosion direct assessment (ECDA) process. This paper will show advances in interpretation of indirect inspection data and selection of ECDA direct examination location and how accurate selection of locations most susceptible to external corrosion would improve pipeline integrity. Comprehensive case studies from several ECDA digs practical experience and lesson learnt from these case studies would be fully presented.Failure in oil and gas pipelines due to leaks has led regulators to require operators to implement ever more rigorous inspections. ANSI/NACE Standard Practice 0502 – Pipeline External Corrosion Direct Assessment Methodology has been developed to ensure safe operation of pipelines and prevention of external corrosion in non-piggable pipelines as well as piggable pipelines where it can be used as a supplement to ILI. This standard requires a minimum of two indirect inspections to confirm the most susceptible locations on a pipeline for external corrosion to occur.Direct examination step of ECDA involves prioritizing the findings of indirect inspections and excavation (for underground pipelines) of locations where coating flaws and corrosion are most likely measurement of coating damage and corrosion defects evaluation of damage severity and root cause analysis.The precise selection of direct examination location would ensure that pipeline operators can reduce unnecessary and costly excavations while making sure that most susceptible external corrosion locations are addressed to prevent future wall loss from corrosion.

Key words: ECDA digs, DC voltage gradient, AC voltage gradient, AC current attenuation, close interval survey, cathodic protection, coating anomaly, data interpretation

Interpretation of indirect inspection data and selection of direct examination locations are crucial steps in conducting successful external corrosion direct assessment (ECDA) process. This paper will show advances in interpretation of indirect inspection data and selection of ECDA direct examination location and how accurate selection of locations most susceptible to external corrosion would improve pipeline integrity. Comprehensive case studies from several ECDA digs practical experience and lesson learnt from these case studies would be fully presented.Failure in oil and gas pipelines due to leaks has led regulators to require operators to implement ever more rigorous inspections. ANSI/NACE Standard Practice 0502 – Pipeline External Corrosion Direct Assessment Methodology has been developed to ensure safe operation of pipelines and prevention of external corrosion in non-piggable pipelines as well as piggable pipelines where it can be used as a supplement to ILI. This standard requires a minimum of two indirect inspections to confirm the most susceptible locations on a pipeline for external corrosion to occur.Direct examination step of ECDA involves prioritizing the findings of indirect inspections and excavation (for underground pipelines) of locations where coating flaws and corrosion are most likely measurement of coating damage and corrosion defects evaluation of damage severity and root cause analysis.The precise selection of direct examination location would ensure that pipeline operators can reduce unnecessary and costly excavations while making sure that most susceptible external corrosion locations are addressed to prevent future wall loss from corrosion.

Key words: ECDA digs, DC voltage gradient, AC voltage gradient, AC current attenuation, close interval survey, cathodic protection, coating anomaly, data interpretation

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