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A radiographic calibration method for eddy current testing of heat exchanger tubes

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The most technically available NDT method for in-service inspection of heat exchanger tubes is eddy current testing. Using a differential ID bobbin probe, tubes can be tested with high speed, but for accurate estimation of tube condition, precisely machined calibration blocks from the same material are necessary. The purpose of this work was to calibrate the eddy current system by radiography without the use of expensive calibration blocks. Wall thickness measurement and deterioration determination due to corrosion/erosion/pitting was evaluated in this study by using radiograph ie film density measurements. It was found that this method can determine the remaining wall thickness as well as pitting corrosion in the tubes using differential and absolute film density measurements. Results show that good precision can be obtained with this method of eddy current system calibration.

Document Type: Research Article


Affiliations: 1: PhD candidate, School of Mechanical Engineering, Sharif University of Technology, Tehran. NDT level-3 Certificate Holder. 2: PhD in Mechanical Engineering, Center of Excellence in Design, Robotic and Automation, School of Mechanical Engineering, Sharif University of Technology, Azadi Ave., Tehran 11365-9567, Iran. 3: PhD in electrical engineering, Radiology Research Lab, Henry Ford Health System, Michigan, USA also Faculty of Electrical and Computer Engineering, University of Tehran, Tehran, Iran. 4: MSc in Metallurgical Engineering, NDT level-2 Certificate Holder. 5: MSc in Nuclear Engineering, signal analysis and simulation expert. 6: MSc in Nuclear Engineering, NDT level-2 Certificate Holder. 7: Production Technician, expert in fabrication of test pieces.

Publication date: October 1, 2004

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