The External Corrosion Direct Assessment Methodology was developed to assist pipeline operators in assessing the integrity of pipelines that could not be assessed using In Line Inspection (ILI or sometimes referred to as Intelligent Pigging).
The External Corrosion Direct Assessment (ECDA) Methodology was developed as an alternative method to determine, and prove, pipeline integrity for pipelines that could not be inspected using intelligent pigs.
It integrates all available pipeline data and allows the condition of the pipeline to be determined and the risk of failure due to external corrosion to be determined and addressed. ECDA is not intended for internal corrosion, nor for pipeline sections that cannot be inspected using traditional overline techniques (such as DCVG, PCM, CIS etc).
The ECDA Methodology has been incorporated into a NACE Recommended Practice RP0502. It is an iterative process designed to identify areas where external corrosion may be expected.