FIELD: measurement equipment.
SUBSTANCE: invention relates to non-contact diagnostics of metal tubes during operation. The inventive method comprises determining the location and depth of the pipeline at the test site, installation along the pipeline of at least two identical sensors for measuring tension (tangential component) of the magnetic field, synchronous recording of changes in the magnetic field caused by stray currents, comparative information processing from all sensors and diagnostic conclusion. The apparatus comprises at least two identical sensors for installation along a pipeline axis, determining the magnetic field, means for linkage at the location, means for determining the depth of the pipeline, a facility of synchronisation of switching and sensor means for recording the magnetic field change caused by stray currents and data processing.
EFFECT: simplification of searching for locations of pipeline corrosion, improving accuracy of fault location.
13 cl, 8 dwg
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