NFT technology uses two coils, a transmitter and a receiver. Typically, the receiver coil is close to the transmitter coil, taking advantage of the transmitter’s near-field zone - that is, the zone where the magnetic field from the transmitter coil induces strong eddy currents, axially and radially, in the tube wall.

NFT probes operate within the same frequency range as remote-field testing (RFT) probes.

NFT is specifically suited to detecting corrosion, erosion, and pitting inside diameter of carbon steel tubing. NFT is perfect for fin-fan tube heat exchangers because eddy currents do not go through the wall of the tube. NFT is also much more sensitive to defects close to structures such as support plates and tube sheets.

Related Service

Internal Rotary Inspection System for Ferrous and Non-Ferrous Tubes (IRIS)

IRIS – Internal Rotary Inspection System: This is an ultrasonic technique for condition assessment of tubing of all materials....

Learn More
Magnetic Flux Leakage Testing for Ferrous Tubes (MFL)

MFL - Magnetic Flux Leakage tube testing technique utilizes strong permanent magnets to magnetize conductive tubes, e.g. Carbon steel tubes.

Learn More
Remote Field Testing for Ferrous Tubes (RFT)

Remote Field Testing (RFT): This is a fast reliable screening tool for the condition assessment of ferrous tubing (carbon steel, ferritic stainless steel and Duplex).

Learn More