Improvements to the External Corrosion Direct Assessment (ECDA) Process Cased Pipes

Technologies that are currently used to assess cased pipes include in-line inspection, guided wave ultrasonic, electromagnetic wave, pulsed eddy current, conformable array, bore scope, pressure testing and visual inspection. Several other technologies are under development, some of which have the potential to be better for inspecting cased pipe than these three tools. While these technologies are recognized as the best minimally invasive technology presently available for identifying and quantifying corrosion and other metal-loss defects, they can not easily or economically be used on many pipelines. Conventional aboveground indirect inspection tools used in ECDA are not effective for cased pipes if there is no electrical path in the annulus between the casing and the pipeline. Even when an electrolyte is introduced into the annulus, the casing may still act as a shield such that the results from most indirect inspection tools regarding the cathodic protection (CP) level or coating condition may not be particularly meaningful. The primary goal of this project is to develop a new ECDA methodology that can be used to assess cased pipes which can not be assessed by standard methods. This new ECDA methodology will fill the assessment gap, enhance safety and protect the environment. The appendix includes "Draft Recommended Guidelines for External Corrosion Direct Assessment (ECDA) Of Cased Pipeline Segments".


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 79p

Subject/Index Terms

Filing Info

  • Accession Number: 01640934
  • Record Type: Publication
  • Contract Numbers: DTPH56-08-T-000012; project #241
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jul 13 2017 9:11AM