Estimation of permeability for magnetic flux leakage modelling

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    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
    Country/TerritoryRussian Federation


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