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Remote field testing

Remote field testing (RFT) is a method of nondestructive testing using low-frequency AC. whose main application is finding defects in steel pipes and tubes. RFT is also referred to as remote field eddy current testing. RFET is sometimes expanded as remote field electromagnetic technique, although a magnetic, rather than electromagnetic field is used. An RFT probe is moved down the inside of a pipe and is able to detect inside and outside defects with approximately equal sensitivity. Although RFT works in nonferromagnetic materials such as copper and brass, its sister technology eddy-current testing is preferred.

Main features
• commonly applied to examination of boilers, heat exchangers, cast iron pipes, and pipelines. • no need for direct contact with the pipe wall • probe travel speed around 30 cm/s (1 foot per second), usually slower in pipes greater than 3 inch diameter. • less sensitive to probe wobble than conventional eddy current testing (its sister technology for nonferromagnetic materials) • because the field travels on the outside of the pipe, RFT shows reduced accuracy and sensitivity at conductive and magnetic objects on or near the outside of the pipe, such as attachments or tube support plates. • two coils generally create two signals from one small defect The main differences between RFT and conventional eddy-current testing (ECT) is in the coil-to-coil spacing. The RFT probe has widely spaced coils to pick up the through-transmission field. The typical ECT probe has coils or coil sets that create a field and measure the response within a small area, close to the object being tested. ==See also==
References and sources
• ASTM E 2096 – 00 Standard Practice for In Situ Examination of Ferromagnetic Heat-Exchanger Tubes Using Remote Field Testing • Outline of RFT ;Specific
Source: Wikipedia ↗
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