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Remote Field Eddy Current Technique(RFET) . is based on the transmission of an electromagnetic field through the tube material. The exciter coil generates eddy currents at a low frequency in the circumferential direction. The Electromagnetic field transmits through the thickness and travels on the outer diameter. A receiver coil that is placed in the remote field zone of the exciter picks up this field. In this Zone, the wall current source dominates the primary field directly from the exciter. The RFET is generally used for the detection of wall loss in Carbon Steel Tubes.
Advantages
Advantages
Inspect ferromagnetic materials (carbon steel and stainless steel).
Detect localised corrosion/erosion.
RFT can detect defects away from tube support plate and tube sheet.
Ideal for ferrous tubes.
Detection of wall loss.
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