The predefined spatial distribution and strength characteristics (absolute value and gradient) of a magnetic field are shown to be reproducible with the use of local sources of the magnetic field (permanent magnets). Consideration of the problem symmetry allows derivation of some characteristics of the field in an analytic form without conducting numerical calculations. A relation has been derived for the distribution of attractive forces in the area between the blocks of a cleaning pig magnets and a pipe. The maximum of the distribution corresponds to the centers of magnetic blocks, while the minimum corresponds to the centers of the gaps between the blocks. If the dimensions of the magnetic blocks in the direction of the pipe axis diminish, the field and the attractive force diminish and the nonuniformity of the angular distribution of these quantities increases. For each ratio of the cleaned pipe radius to the field source radius, the source axial symmetry has an optimum order, which ensures its largest force effect. An expression for such an estimate has been derived. The effects of the cleaned pipe ferromagnetic material and the presence of higher harmonics in the field enhance the angular dependence of the magnetic system field.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Calculation of the magnetic systems of diagnostic and cleaning pigs for oil and gas pipelines


    Additional title:

    Berechnung des magnetischen Systems für Diagnose- und Reinigungsmolche in Öl- und Gasfernleitungen


    Contributors:

    Published in:

    Publication date :

    2006


    Size :

    9 Seiten, 6 Bilder, 3 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Calculation of the magnetic systems of diagnostic and cleaning pigs for oil and gas pipelines

    Lukhvich, A. / Lukyanov, A. / Polonevich, A. et al. | Tema Archive | 2006


    Pigs for cleaning high-contamination pipelines

    Nichols, B. / Pipes and Pipelines International | British Library Conference Proceedings | 1997



    Velocity control of pigs in gas pipelines

    Mathews, L. et al | British Library Conference Proceedings | 1997


    Corrosion inspection of small-diameter pipelines with ultrasonic pigs

    Dongsheng, L. / Changming, W. / Jie, C. | Tema Archive | 2001