ELECTRODYNAMIC CRITERION FOR EVALUATING THE QUALITY OF UNDERGROUND PIPELINE INSULATION
Keywords:electromagnetic field, underground pipeline, dispersion equation, insulating coating, substitute circuits, current attenuation, noncontact measurements, quality criterion, detection method
A three-unit mathematical model is presented to describe the electromagnetic field of an underground pipeline. This model is based on the solutions of boundary value problems in electrodynamics for cylindrical structures, the theory of electric circuits with distributed parameters, and the theory of the distribution of electric currents and magnetic fields. Using this model, the dependence of field characteristics on the parameters of the pipe and the surrounding environment was investigated. Diagnostic methods and tools for examining the anti-corrosion protection of main pipelines and pipeline networks were developed. By comparing the field attenuation coefficient along the pipeline with the electromagnetic wave attenuation in the soil, an electrodynamic criterion for evaluating the quality of the protective coating in different areas can be proposed. Examples illustrating the prompt detection of areas with unsatisfactory insulation of underground main pipelines through non-contact current measurements are provided.
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