ECDA (External Corrosion Direct Assessment)

￭ Inspection CP system and coating

￭ Structure Failure Direct Exam.

￭ Analysis of corrosion root cause



Underground Pipeline Integrity Inspection 1

CP management and routine surveys

￭ On/OFF potential measurement

￭ Soil resistivity measurement

￭ Pipeline locating survey

￭ Isolation test

￭ Soundness of CP facilities (TB and rectifier, etc)




Underground Pipeline Integrity Inspection 2

CP in-depth surveys

￭ CIPS (Close Interval Potential Survey)t

￭ Coating Defect Survey (DCVG)t

￭ Static (dynamic) interference survey t

￭ Temporary ICCP tests for CP retrofit

Damaged Coating Detection




Underground Pipeline Integrity Inspection 3

ECDA (External Corrosion Direct Assessment)

￭ Based on NACE RP0502-2002

￭ Inspect the soundness of CP system and coating quality, basically.

￭ Direct (excavation) inspection of points having a high probability of corrosion

￭ Provision of root cause for corrosion

 
 

ECDA