Tubular inspection
Magnetic Flux Leakage (MFL)

MFL is a tube testing technique primarily designed for rapid testing of ferromagnetic tubes with nonferromagnetic fins wrapped around them, as in Air Fin Coolers. Two strong magnets generate a static magnetic field that saturate the tube wall (Fig.). When a flaw (Pitting, Wall Loss, etc.,) is located between the two magnets, the magnetic flux in the tube wall is disturbed and a small amount of flux will leak in the inner tube. This leak of flux is detected by the coils placed between the magnets. The variation of the flux leakage induces the current in the coils, thereby causing a signal output. This signal output can be used to provide information on wall thickness reduction, if any, in the tube. Magnetic Flux Leakage (MFL) is mainly applied for the inspection Air Fin Coolers. However it can be used for inspecting bare tubes with diameters one inch and above.

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