Monitoring of a pipeline under cathodic protection

摘要

The method involves measuring electrical current charged in a connection between a buried metal drain (2) and a coupon (11), and determining an average direct current (DC) voltage. Another coupon (21) is polarized with the average DC voltage with respect to a reference electrode (25) using a polarization circuit and an auxiliary electrode (5). Another electrical current circulating in a branch of the connection toward the auxiliary electrode of the polarization circuit is measured. Two surface current densities corresponding to the measured currents are stored for multiple times. Independent claims are also included for the following: (1) a device for monitoring a buried metal drain subjected to cathodic protection (2) a system for monitoring a buried metal drain subjected to cathodic protection.