The contour plot seen in Figure 5 shows the calculated potential distribution on the two pipelines with varying coating quality. The contour plot is of the results with the higher value of soil resistivity. The effect that the bent pipe has on the straight pipe in terms of potential distribution has been plotted in Figure 6 (high soil resistivity) and Figure 7 (low soil resistivity). The two plots show the results at a location adjacent to the aged coating and at a location away from the aged coating. The aged coating affects the potential distribution around the pipe, whereas in areas away from the aged coating, the potential distribution is relatively uniform around the circumference of the pipe.
Computer Simulation as an aid to CP System Design and Interference Predictions, Robert Adey and John Baynham, BEASY