The ability of an eddy-current test to detect and evaluate corrosion in heat exchanger tubing is investigated in this report. Two types of tubing are considered;a finned copper tubing used in a water-cooled Freon condenser and a straight-wall cylindrical stainless steel tubing used in a Freon-Freon heat exchanger. The resolution and sensitivity of these tests are determined and the testing techniques, instrumentation, and theory of the test are discussed. A relationship is shown between the eddy-current indications obtained from drilled through holes and indications obtained from actual corrosion pits.
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