DEVICE FOR DETECTING ELLIPTICAL DEFORMATION OF CIRCUMFERENTIAL CROSS SECTION OF HEAT-EXCHANGER HEAT-TRANSFER TUBE

摘要

Provided is an apparatus for detecting an ovality of a circumference of a cross section of a heat exchanger tube, the apparatus including a probe body inserted in a heat exchanger tube, moveable in a lengthwise direction of the heat exchanger tube, and rotatable in a circumferential direction of an inner surface of the heat exchanger tube, a support foot disposed at both ends of the probe body to support a linear movement and a rotation of the probe body, a coil support unit provided at different locations of the probe body, and an eddy current coil mounted on the coil support unit, and including a first coil unit and a second coil unit to measure an eddy current resistance to detect an ovality of the heat exchanger tube, and the eddy current coil may use one coil unit among the first coil unit and the second coil unit as a test coil and a remaining as a reference coil, or may use both the first coil unit and the second coil unit as test coils.