Damage Approximation Methodology in Metal Pipelines Based on Variation of Magnetic Field Direction and Surface Methods

Abstract

Electromagnetic methods are used for the accurate integrity assessment of buried pipelines. A non-invasive electromagnetic inspection method for metallic pipelines is described which uses magnetic field line variations (MFLV) to determine the position and thickness of faults in metal pipes. The skin effect is applied to solve the framework problem and establish the measurements for identifying the vector angle variations. A simulation case of the mathematical assumptions was performed to verify the presence of damage in a pipeline by comparing magnetic field measurements at different transmitted signal frequencies. Finally, the technical specifications of the required electronic equipment were defined to implement the technology.