Estimation of permeability for magnetic flux leakage modelling

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    3 Downloads (Pure)


    Non-destructive testing techniques are gen-erally used for the evaluation of material properties and the detection of defects in pipelines. Especially, the measure-ment of magnetic flux leakage (MFL) is one of the most used methods for in-service monitoring of corrosion in buried oil and gas pipelines. However, for the geometrical reconstruction of defects in a pipeline from measured signals (the inverse problem), the magnetic properties of the mate-rial need to be known accurately. Due to the pipe geometry and wall thickness measurement of the bulk properties is complicated. In particular, the permeability of ferromagnetic steels shows a non-linear and hysteretic behaviour.
    Current research is focussed on the measurement and simulation of the permeability of pipeline material. The magnetic properties of a small ferromagnetic test sample is first investigated using a transformer set up in order to find a correct fitting equation for the non-linear permeability as a function of the magnetic flux density. This equation is then used for model simulations of a MFL test set up. Refitting the parameters of the permeability equation to the perme-ability of the pipeline material in the MFL set up proved that flux leakage signals could be predicted accurately for sev-eral defects by model simulation.
    Original languageEnglish
    Title of host publication10th International IMEKO TC7 Symposium
    Place of PublicationTomsk
    PublisherTomsk Polytechnic University
    ISBN (Print)5-93629-167-7
    Publication statusPublished - 30 Jun 2004
    Event10th IMEKO TC7 International Symposium on Advances of Measurement Science 2004 - Saint-Petersburg, Russian Federation
    Duration: 30 Jun 20042 Jul 2004
    Conference number: 10


    Conference10th IMEKO TC7 International Symposium on Advances of Measurement Science 2004
    Abbreviated titleIMEKO TC7
    CountryRussian Federation

    Fingerprint Dive into the research topics of 'Estimation of permeability for magnetic flux leakage modelling'. Together they form a unique fingerprint.

    Cite this