Author(s)

A. Mujezinović & A. Muharemović

Abstract

This paper analyzes the phenomenon of potentials deviation (ON/OFF potentials) as a result of changes in the soil resistivity, when applying cathodic protection systems with galvanic anodes on PCCP (pre-stressed concrete cylinder pipes) in ambient desert conditions. Measurement of ON and OFF potentials on a long section with different values of the soil resistivity have shown that there are great deviations in parts of sections which are proportional to the measured values of the soil resistivity. Analyzing the changes in a value of IR drop show that the ON potential changes very little in the case of high values of the soil resistivity, as well as that on these sections, a high value of IR drop appear, i.e. great change OFF potential. Over time, this difference between the ON and OFF potentials in these sections decreases and this is a case of a full polarization of PCCPs. If the value of the electrical soil resistivity is relatively low, it can be concluded that the IR drop is negligible. Keywords: cathodic protection (CP), protection current, measurements, desert conditions, ON/OFF potentials, pre-stressed concreted cylinder pipe (PCCP).

Keywords

cathodic protection (CP), protection current, measurements, desert conditions, ON/OFF potentials, pre-stressed concreted cylinder pipe (PCCP).