Augmenting MFL Tools with Sensors that Assess Coating Condition

External coatings are routinely used to protect transmission pipelines from corrosion; however, coatings may degrade or disbond over time enabling corrosion to occur. Transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools to detect metal loss corrosion defects. Rather than finding the cause of a problem, failure of the coating within a corrosive environment, MFL corrosion surveys only find the result of the problem, corrosion defects that may permanently alter the pressure carrying capacity of the pipeline. Stress corrosion cracking (SCC) can be detected using in-line inspection technology, but the availability of tools is limited and the cost of inspection is high compared to MFL inspection. SCC almost always occurs at disbonds - direct coating assessment could indicate future problems that could degrade the serviceability of the pipeline. The objective this work is to develop new sensors to detect external coating disbondment that could work with currently available in-line inspection tools for minimal additional cost to perform the inspection. As part of this work, the capability of this sensor will be demonstrated at an in-line inspection vendor facility. The value of a successful outcome of this project would be the ability to use a single MFL in-line inspection run to detect and size corrosion locations and assess coating condition for the entire pipeline.


  • English


  • Status: Completed
  • Contract Numbers:


  • Sponsor Organizations:

    Pipeline and Hazardous Materials Safety Administration

    U.S. Department of Transportation
    East Building, 2nd Floor 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Mataich, Joseph

  • Performing Organizations:

    Battelle Memorial Institute

    Columbus Laboratories
    Columbus, OH  United States  43201
  • Principal Investigators:

    Nestleroth, Bruce

  • Start Date: 20060915
  • Expected Completion Date: 0
  • Actual Completion Date: 20090309
  • Source Data: RiP Project 35232

Subject/Index Terms

Filing Info

  • Accession Number: 01492465
  • Record Type: Research project
  • Source Agency: Department of Transportation
  • Contract Numbers: DTPH56-06-T-000019
  • Files: RiP
  • Created Date: Sep 10 2013 1:00AM