Let's start by imagining a Pipeline
It's a relatively new pipeline segment that's isolated on both ends and is about 1.6 miles long. It starts at a facility with some aboveground equipment west of Greeley, Colorado, and ends at a road, with what appears to be a creek bed in-between. The terrain appears to be mostly flat farmland. Continue scrolling for some images of the pipeline that we generated with Survey Manager.
Scenario 1: Depolarized Potential Survey
A recent depolarized potential survey for this pipeline shows something strange. As you can see in the Survey Manager screen captures that follow, there's a significant voltage fluctuation at around 1,250 feet. This indicates that there's something not quite right, but without more information we have more questions than answers. Could there be a protected structure above or below our pipeline? Is a nearby pipeline affecting the reading?
Scenario 2: depolarized Potentials + CIS Data
To help shed some light on the potential issue, let's use Survey Manager to overlay close interval survey data taken shortly after the native survey. In the Survey Manager screen capture that follows, notice that the CIS results fluctuate in the same area, confirming that there's interference. This rules out the possibility that the fluctuation is due to an IR reading problem.