Three modeling methods in MFL testing

Magnetic flux leakage (MFL) measurement is one of the most widely used non-destructive testing techniques for in-service inspection of oil and gas pipelines. Three methods, Numerical computation, theory analytical and experiment, have been used to model the MFL testing and have been investigated separately before. In this article, we introduced a MFL analytical model based on dipole magnetic charge method, a MFL Numerical model base on three dimensional FEM. Test equipment and samples were designed and produced to make a MFL experiment model, the results by three models were analysis. We summarized the advantages and disadvantages of three different methods and discussed.