Near Field Testing (NFT)

Near Field Testing (NFT)

Near Field Testing (NFT)

Near Field Testing (NFT)

Near Field Testing (NFT) technology is a rapid and cost-effective solution intended specifically for fin-fan carbon-steel tubing inspection. This technology relies on a simple driver-pickup eddy current probe design providing very simple signal analysis. NFT is specifically suited to the detection of internal corrosion, erosion or pitting in carbon steel tubing. The NFT probes measure lift-off or ‘fill factor’ and convert it to amplitude-based signals. Because eddy-current penetration is limited to the inner surface of the tube, NFT probes are not affected by the fin geometry on the outside of the tube.

Merits of NFT Inspection

  • NFT is faster than electromagnetic testing techniques.
  • External reference coil is not required during NFT.
  • The results of NFT are unaffected by support plates and Tube sheets.