MAGNETIC FLUX LEAKAGE (MFL)

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How MFL works? 
The basic principle behind MFL involves magnetizing a ferrous metal object to saturation level with a powerful magnetic field. Where the object has no flaws, the magnetic flux will remain undisturbed. MFL uses a powerful magnet to magnetize the conductive material under test (usually steel). Where there are defects like corrosion or material loss, the magnetic field “leaks” from the steel. MFL probes incorporate a magnetic detector placed between the poles of the magnet where it can detect the leakage field. During inspection, a magnetic circuit of sorts forms between the part and the probe. The magnetic field induced in the part saturates it until it can no longer hold any more flux. The flux overflows and leaks out of the pipe wall and strategically placed sensors can accurately measure the three-dimensional vector of the leakage field. Because magnetic flux leakage is a vector and that a sensor can only measure one direction, any given probe must have three sensors to accurately measure the axial, radial, and circumferential components of an MFL signal.

 

How Masterscan uses MFL? 

  • Detection of corrosion and pitting in steel structures.

  • Integrity assessment of pipelines and storage tanks

  • To detect corrosion in applications where large areas are to be inspected in short time scales. 

  • Tank Floors.

  • Employs fast and reliable inspection programs. 

  • MFL is widely used in the context because of its inherent speed.

  • Determines geometry of the defects accurately and formulates optimum repair strategy.