Method and apparatus for estimating the condition of a...

G - Physics – 01 – N

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G01N 17/02 (2006.01)

Patent

CA 2740379

Methods are provided for reducing interference from stray currents in buried pipelines/metal structures during MEIS testing or other current-sensing applications in the pipeline. Methods are provided for measuring bulk complex electrical impedance between a buried pipe and the soil, thereby rendering an indication of the quality of anticorrosive coating. Methods are provided for measuring the complex propagation constant of AC voltages propagating along an attenuative pipeline. This information assesses the general condition of the anti-corrosive coating involved, or enhance MEIS inspection of the pipeline. Methods are provided for enhancements to MEIS testing, including (a) canceling magnetometer offset effects associated with the Earth's magnetic field after the magnetometer is positioned for measurement, (b) implementing a separate sensing connection to the pipe so as to avoid interference from voltage loss in the pipe feed-line connection, (c) providing a power amplifier to excite the pipe with large amplitude signals.

L'invention concerne des procédés visant à réduire le brouillage provenant de courants vagabonds dans des pipelines/structures métalliques enfoui(e)s pendant un test MEIS ou d'autres applications de détection de courant dans le pipeline. L'invention concerne des procédés de mesure de l'impédance électrique complexe de volume entre une conduite enfouie et le sol, ce qui permet d'obtenir une indication de la qualité du revêtement anticorrosion; des procédés de mesure de la constante de propagation complexe de tensions en courant alternatif propagées le long d'un pipeline atténuant. Ces informations permettent d'évaluer l'état général du revêtement anticorrosion ou d'améliorer l'inspection MEIS du pipeline; des procédés permettant d'améliorer les tests MEIS, qui comprennent: (a) la suppression des effets de décalage de magnétomètre associés au champ magnétique terrestre après le positionnement du magnétomètre en vue de la mesure, (b) l'installation d'un connexion de détection séparée avec la conduite afin d'éviter le brouillage dû à la perte de tension dans la connexion de ligne d'alimentation de la conduite, (c) un amplificateur de puissance prévu pour exciter la conduite à l'aide de signaux de grande amplitude.

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