METHOD TO PROVIDE ANODE PROTECTION Russian patent published in 2021 - IPC C23F13/00 

FIELD: electrochemical protection of underground structures.

SUBSTANCE: invention relates to electrochemical protection of underground structures against ground corrosion. A well is drilled that is parallel to the structure protected at the groundbed location and is below the groundwater level and the soil-freezing level. The structure – earth potential value is measured in relation to the copper-copper sulfate electrode. The anode grounding site is divided into intervals described as having different protection potentials. Intervals of safety and lightning-protection earths’ impact on the parameters of cathodic current emergence at the structure protected are determined. The structure – earth potential value in these intervals is reduced in absolute terms because cathodic protection current is shielded by the protection earth elements, electrically connected with the cathode-protected structure. At this interval, pipes are installed in the well drilled, resembling two connected half-shells made of materials featuring different electrical resistance values. While the pipes are being installed a pipe is placed so that the half-shell made of a material with higher electrical resistance value is turned to the protection earth. The construction comprising two half-shells welded together is connected with pipes made of a conductive material and protective electrodes are pulled inside with the subsequent filling of a conductive solution.

EFFECT: longer service life of the anode grounding given the detrimental effect of the elements of the safety and lightning-protection earths on current distribution parameters in the cathode protection system.

1 cl, 1 dwg, 1 ex