Defining Cathodic Protection Potential Distribution of Long Distance Pipeline with Numerical Simulation

The physical model of cathodic protection distribution of the long distance pipeline was established, and the mathematics model of the potential distribution was deduced by the tube element method of boundary element algorithm. Using the cathodic polarization curve as boundary conditions, piecewise linear fitting was dealt with. Based on the mathematical model and boundary conditions above, using Matlab programming tools, the cathodic protection potential distribution of long distance pipeline was calculated and its comparson with that of the experimental designed pipeline showed similar results. The influence of the number of units on the calculation results was concluded that the right choice for the size of the unit number is very meaningful to calculation efficiency and error control.