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Remote Field Eddy Current (RFET)

Remote Field is a technique used for the inspection of tubes made of ferrous materials, like Carbon steel and Chrome-Molybdenum. RFT is only one of the techniques available for inspection of carbon steel tubes. Since al inspection techniques that are available for carbon steel have limitations compared to conventional eddy current, it is even more important to select the most suitable technique for each different situation.

For the inspection of carbon steel tubes it is often recommended to use a combination of one or more techniques. Overall wall-loss can be easily detected and accurately quantified. Local defect scan be detected and quantified provided that they have some volume (diameter pit >5 mm).

RFT can detect both in- and external defects but it is not possible to distinguish between them. Widely used in Steel, Automotive and Aerospace industries, the eddy current method is one of many electromagnetic testing methods used in Non-Destructive Testing (NDT). It makes use of electromagnetic induction to detect and characterize surface and sub-surface flaws in conductive materials.

FAQs:

A low-frequency alternating current induces an electromagnetic field that travels through the tube wall, with sensors detecting field variations caused by defects. Unlike conventional eddy current testing, RFEC is highly sensitive to flaws on both the inner and outer surfaces.

RFET is specifically used for ferromagnetic materials like carbon steel, where traditional eddy current techniques have limited penetration.

RFET is widely used in heat exchanger tubes, boiler tubes, and pipelines for corrosion monitoring, erosion detection, and structural integrity assessment.