Study on the Cathodic Protection Test Probe for Buried Steel Pipeline

摘要

In case it is inconvenient to interrupt power supply or there exists stray current, the cathodic protection test probe can be applied to evaluate the efficiency of the cathodic protection system. The measurement accuracy of the test probe largely depends on its structure, and is studied extensively in this work, including the porous tip's porosity and aperture, the coupons' geometry and distance, as well as the type of the built-in reference electrode and electrolyte. Both laboratory experiments and field tests are carried out, showing that the designed cathodic protection test probe performs well in measuring the polarized potential and the native potential.