Case 2: Effect of a holiday in the coating of the straight pipe

The aim of the second case analysis was to determine the effect of a holiday in the coating of the straight pipe. The effect of the holiday on the potential distribution on the bent pipe can be seen in Figure 8. The contour plots of potential and current density on the bent pipe are shown in Figure 9 and Figure 10 respectively. The results in the plots were observed at the location on the bent pipe most affected by the holiday on the straight pipe. It can be seen in Figure 10 that over a small area, the current density reaches a positive value, indicating that this area is behaving anodically. This stray current from the bent pipe does not appear when the value of soil resistivity is decreased.

On the object of stray current corrosion see also: DC traction, Cathodic protection, Coating, Contour plots, Definition, Detection, Examples, External currents, Historical perspective, Impressed current, Interference, Mechanisms, Modeling. Pipeline, Potential distribution, Prevention, Stray fields and leakage, Transit systems

Computer Simulation as an aid to CP System Design and Interference Predictions, Robert Adey and John Baynham, BEASY