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
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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