FIELD: mechanical engineering. SUBSTANCE: to check pipe line for condition and for separation of protective coat provided with cathodic protection, sinusoidal excitation currents are locally passed through it; then reply reactions are measured by voltage and replies at different frequencies are compared. State of protective coat is judged from difference or coincidence of replies at different frequencies. Invention contains data on parameters of excitation currents, frequencies and range of their relationships. EFFECT: enhanced efficiency. 7 cl, 7 dwg, 1 tbl
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