METHOD FOR INTEGRATED CONTACTLESS GROUND TECHNICAL DIAGNOSTICS OF UNDERGROUND PIPELINES Russian patent published in 2017 - IPC F17D5/06 

FIELD: machine engineering.

SUBSTANCE: first, the exact location of the pipeline axis is determined via the line location complex, and then the location of the pipeline insulation coating violations is determined by placing pairwise four copper-sulphate comparison electrodes on the ground. Approaching the insulation coating defect, the pulsing gradient values of the direct current voltage and the potentials "pipe-ground", synchronous with the DC breaker tact, are observed on the metre, by which the location of the insulation coating defect epicenter is determined, in which the longitudinal stress gradient is zero, and the transverse voltage gradient reaches its maximum value, then the measurements of soil resistivity along the underground pipeline are performed, the study of the underground pipeline is performed by magnetic imaging, and finally the control pit sampling is performed according to the land survey in the most dangerous areas, and the complex index of the technical p pipeline state is determined according to the obtained results, on the basis of which the decision is made on the conditions for the further pipeline operation.

EFFECT: increasing the accuracy of determining the location and size of the insulation coating damage, assessing the pipe metal state of the underground pipeline.

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