Advanced NDTNon Destructive Testing (NDT)

Magnetic Flux Leakage for Tube Inspection


mful1_0      mful3




  • Suitable for ferromagnetic tube such as those found in air cooler and heat exchangers
  • Very good sensitivity to pitting, circumferential cracks and localized wall loss
  • Inspection speed can goes up to 1 m/s
  • The signal output is sensitive to speed variation
  • The sizing of defect is limited because there is no phase component on the signal
  • The fill factor is similar to eddy-current technique : approximately 80% is required.


  • Magnetic Flux Leakage is pre-dominantly applied for inspection

        Air Fin Coolers.

  • Not affected by the presence of  Aluminum Fins in air- finned coolers.
    • Relatively high speed inspection, 0.5 m/s to 1.0m/s.
    • Very good sensitivity to Pitting and circumferential  grooves.
    • Identify the ID pitting from the Trail coil.