Magnetic Flux Leakage (MFL)
Magnetic Flux Leakage (MFL) is a non-destructive testing method used to detect variations in the wall thickness due to corrosion, erosion, pitting, among others, most commonly in storage tanks and piping.
When ferromagnetic materials are magnetized, magnetic lines of force flow through the material and complete a magnetic path between the pole pieces. These magnetic lines increase from zero at the center of the test piece, and increase in density and strength toward the outer surface. As magnetic flux lines are contained within the piece, it is difficult to detect them in the air space surrounding the object. However, if a crack or other defect disrupts the surface of the magnetized piece, permeability is drastically changed and leakage flux will emanate from the discontinuity. By measuring the intensity of this leakage flux, it is possible to determine to some extent the defect’s severity.
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