External Corrosion Direct Assessment
Definition - What does External Corrosion Direct Assessment mean?
- Locating and addressing corrosion activity
- Fixing corrosion defects
- Removing the causes of corrosion
ECDA cannot be successfully assessed on all pipelines. Therefore, other assessment methods precautions should be taken when selecting ECDA techniques.
Corrosionpedia explains External Corrosion Direct Assessment
ECDA is a continuous process to improve pipeline safety and monitor external corrosion. Through using ECDAs, pipeline operators or owners can identify and address locations where corrosion has occurred or has the potential to occur.
Since buried pipelines are out of sight, it is a key concern for monitoring the integrity of this pipeline to many manufacturers and process engineers. So a comprehensive system needs to develop to the continuous evaluation of the buried structure’s condition. This system is known as ECDA. ECDA involves the following four steps:
- Pre-assessment: In this step, the following is done:
- Collect historic and current data to determine whether ECDA is feasible
- Define ECDA regions
- Select indirect inspection tools
- Indirect inspection: In this step, above-ground inspections are done to identify and define the severity of coating faults, other anomalies and areas where corrosion activity may have occurred or may be occurring.
- Direct examination: includes analyses of indirect inspection data to select sites for excavations and pipe surface evaluations. The following is also done:
- Evaluation of pipeline coating performance
- Corrosion defect repairs
- Mitigation of corrosion protection faults
- Post-assessment: In this step, analyses of data are collected from the previous three steps to assess the effectiveness of the ECDA process and determine reassessment intervals.
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