Boiler piping of fossil-fuel combustion power generation plants are exposed to high-temperature and high-pressure environments, and failure of high-energy piping due to creep damage has been a concern. Therefore, a precise creep damage assessment method is needed. This paper proposes a nondestructive method for creep damage detection of piping in fossil-fuel combustion power generation plants by ultrasonic testing. Ultrasonic signals are transformed to signals in a frequency domain by Fourier transform, and a specific frequency band is chosen. To determine the creep damage, the spectrum intensities are calculated. Calculated intensities have a good correlation to life consumption of the weld joints, and this method is able to predict the remaining life of high-temperature piping, which has been already installed.
Ultrasonic Creep Damage Detection by Frequency Analysis for Boiler Piping
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Hatanaka, H., Ido, N., Ito, T., Uemichi, R., Tagami, M., and Nakagawa, H. (July 14, 2006). "Ultrasonic Creep Damage Detection by Frequency Analysis for Boiler Piping." ASME. J. Pressure Vessel Technol. November 2007; 129(4): 713–718. https://doi.org/10.1115/1.2767364
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