Traditionally, close interval potential surveys (CIPS) and direct current voltage gradient
surveys (DCVG) have been undertaken separately and the corrosion engineer has been
saddled with the task of trying to correlate the results of these surveys, to assess the level of
cathodic protection on the pipeline and the effect of coating holidays on the effectiveness of
the cathodic protection system. This paper outlines a method of undertaking both surveys
simultaneously and the benefit to the corrosion engineer of having accurate and correlated
surveys. The paper also deals with surveying pipelines affected by stray currents.