Remote Field Testing (RFT) is a nondestructive examination (NDE) method that involves electromagnetism. This method is often associated with Eddy Current Testing (ECT) and the term “Remote Field Eddy Current Testing” is sometimes used to describe the process, although there are some differences between RFT and ECT.
The primary use of RFT is to inspect ferromagnetic tubing, including some ferritic stainless steels. The process can detect and size wall loss at baffle locations, isolated pitting, corrosion, cracks, and mechanical damage. It can also be used in boiler tube inspection and can inspect tubing that has a non-conductive coating.
RFT works by using a probe, which consists of an exciter coil and detectors that is pulled through a tube. The coil is driven with a low frequency current so that it produces a magnetic field. This magnetic field induces circumferential eddy currents which extend both axially and radially through the tube wall. The eddy currents then cause the wall to produce it’s own magnetic field which opposes the field produced by the probe. The detectors, which are located a distance away from the exciter coil, are able to measure the voltage produced by the tube wall’s magnetic field for consistency. Any inconsistencies in the field are signs of flaws in the tube wall, such as corrosion, cracks, or pitting.
Hi-Tech Testing has a dedicated staff of experts, as well as the necessary equipment, to provide remote field testing in a way that meets all code, standard and specification requirements. We strive to obtain production while ensuring quality is our primary focus. Contact us to get in touch with one of our remote field testing experts.