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DOI:

2014. . No. 3(65) - Sep 2014, pp. 51-55

Pulse Reflectometry for Tube Inspection. Recent Developments

N. Amir

Pulse Reflectometry is a noninvasive technique for probing the properties of cavities and materials. In recent years the acoustic version of pulse reflectometry has been applied successfully to inspection of condensers, boilers, preheaters and other heat exchangers, by sending acoustic pulses into the air enclosed within the tubes and analyzing the reflections created by defects on the internal diameter (ID). This method enables detection of defects such as blockages, holes and ID wall loss. Recent developments extending this technique further enable detection of a wider range of defects with higher accuracy. These developments will be presented here, along with tests demonstrating the performance of this technique.
 
Keywords: inspection of heat exchanger, pulse reflectometry, guided waves
References
  1. Krzywosz, K., Cagle L. Flaw detection and characterization in heat exchanger tubing. MTI Project 123, 1999.
  2. Amir N., Barzelay O., Yefet A., Pechter T. Condenser Tube Examination Using Acoustic Pulse Reflectometry. J. Eng. Gas Turbines Power, 2010, vol. 132, no. 1.
  3. Amir N., Shimony U., Rosenhouse G. A Discrete Model for Tubular Acoustic Systems With Varying Cross Section. The Direct and Inverse Problems. Part 1: Theory. Acta Acustica, 1995, vol. 81, pp. 450–462.
  4. Park I., Kim Y., Park S., Ahn Y., Gil D. Application of ultrasonic guided wave to heat exchanger tubes inspection. In: 17th WCNDT, Shanghai, 2008.
 
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