NDT - Phils., Inspection Services Corporation

• 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.

Advantages

• 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.