MONITORING OF A BURED CANALIZATION SUBJECT TO CATHODIC PROTECTION

摘要

The invention relates in particular to a method for monitoring a cathodic protection buried metallic pipe (2), comprising the steps of: measuring a first electric current discharged in a connection between the pipe and a first buried coupon (11) next to the pipe, measuring a first voltage between the first coupon (11) and a first reference electrode (15) buried next to the first coupon (11). This method is remarkable in that it comprises the steps of determining a mean DC voltage as a function of the first voltage, biasing a second coupon (21) to said average DC voltage, relative to a second reference electrode (25). using a bias circuit and an auxiliary electrode (5), the second reference electrode and the auxiliary electrode being buried next to the second coupon (21), measuring a second current flowing in a connecting branch towards the electrode auxiliary circuit (5), and memorize, for a plurality of instants, a first current surface density corresponding to the first current and a second current surface density corresponding to the second current.