Application of Ultrasonic Guided Wave Method for Flaw Detection in Coal-Fired Power Plants

Abstract:

Ultrasonic guided wave method used for detection of cracks in the desuperheater header and main steam pipes of boiler in power plants has been reported. The dispersion curves of the guided wave for the main steam pipe were calculated and the wave modes used for the detection of notches were verified experimentally. One defect was found at the welded joint of the low temperature pipe on the furnace side. The time of flight diffraction (TOFD) was also carried out to verify the experimental results. The length, depth and height of the defect are 1200 mm, 18.9 mm and 5.5 mm, respectively. And one circular crack was found inside of the desuperheater header.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 2590-2593
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.2590
• Online since: February 2012
• Authors: Shi Tao Li, Hong Sheng Cai, Jing Yang
• Keywords: Dispersion Curves, Flexural Mode, Longitudinal Mode, Torsional Mode, Ultrasonic Guided Wave

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