to perform a survey and, if a discontinuity is found, the coating is removed and Magnetic Particle Inspection is used to verify the presence of the break.
Other eddy current inspection techniques are used for determining the condition of heat exchanger tubes used primarily in refineries and chemical plants. In this arrangement the Eddy Current Probe coil is most often positioned within the tube after cleaning. Using Eddy Currents, the operator can reliably determine the position of the indication, internal or external, and extent of damage.
Eddy currents are generated when a current conducts into a coil that, in turn, produces a small magnetic field around the coil. This magnetic field produces eddy currents in the metallic material, which can be measured and analyzed.
When the eddy current probe is brought into proximity to a defect, the eddy currents are disrupted causing a deflection of the currents noticed by the pick-up coil and display on the screen.
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Quickly becoming a cost effective alternative to Magnetic Particle Inspection, Surface Eddy Current Inspection allows for the operator to locate cracks and other surface and near-surface discontinuities without the need for costly removal of non-metallic coatings. Often times, surface eddy current inspection is used
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