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. Analytical model can express MFL signal by an equation but it is difficult to deal with realistic defect shapes and the influence of test parameters. Compared with analytical method, numerical model can process different defects shapes, materials, magnetizing situation but it has a more complicated procedure and higher computational cost. Experiment results can validate the simulation of analytical and numerical models, while it difficult to do many experiment due to the high costs and time consuming.
Three modeling methods in MFL testing
Drei Modellmethoden in der magnetischen Streuflussprüfung
2008
6 Seiten, 5 Bilder, 7 Quellen
Conference paper
Storage medium
English
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