METHOD OF CATHODE PROTECTION OF UNDERGROUND STEEL PIPELINE Russian patent published in 2018 - IPC C23F13/02 

FIELD: physics.

SUBSTANCE: invention relates to equipment for the electrochemical protection of underground metal structures from corrosion. Method includes the alternation of control and duty cycles, in this case, during the control cycle, the polarization curve of the protective potential of the pipeline section located in the immediate vicinity of the cathode station is removed from the logarithm of the output current of the cathode station, determine the upper and lower limits of regulation of the protective potential, choose a value between the upper and lower limits of the regulation of the potential, which is maintained throughout the subsequent operating cycle, near the lower limit of regulation, while the protective potential value corresponding to a sharp change in the slope of the polarization curve is taken as the upper limit, at the same time, in the control cycle, prior to the removal of the polarization curve, remote cathodic polarization of the most distant pipeline sections located at the boundaries of the protective zone of the cathode station is carried out, up to the normalized value (-0.85 V) in the absence of the output current of the cathode station with the help of measuring points containing a potential measuring instrument located near the distant areas mentioned, potential sensor, protector, breaker, self-contained power source and transceiver, and the value of the cathode potential (-0.85 V), to which the most distant sections of the pipeline are polarized, is taken as the lower limit of the protective potential adjustment range.

EFFECT: ensuring reliable protection of the pipeline along the entire length of the protection zone of the cathode station with reduced electricity consumption.

1 cl, 2 dwg