Effect of Stray Currents on Underground Pipelines within the Niger Delta Region

Abstract

This study was undertaken to determine the effects of stray currents on underground pipelines within the Niger Delta area. Two gas pipelines were selected for this experiment to investigate the presence of stray currents. The Stationary data logger and the Close Interval Potential Survey tool were used in measuring dynamic stray currents and static stray currents respectively. The sections on the pipelines for survey were selected based on their proximity to possible sources of stray currents. Three sections were surveyed for the first pipeline and two sections for the second pipeline. On survey of the pipelines, significant amount of stray current were detected, sufficient enough to cause corrosion on the pipelines. Furthermore, the effects of the stray current on the pipeline due to weight loss and errors in pipe to soil potential readings were determined. Finally, the sources of the stray currents were investigated and suitable control measures proffered in a bid to protecting the pipelines.

Keywords: Niger Delta, corrosion, direct current, stray current, cathodic protection.