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RESEARCH PAPERS

Ultrasonic Creep Damage Detection by Frequency Analysis for Boiler Piping

[+] Author and Article Information
Hiroaki Hatanaka

Production Engineering Center, IHI Corporation, 1 Shin-Nakaharacho, Isogo-ku, Yokohama 235-8501, Japanhiroaki̱hatanaka@ihi.co.jp

Nobukazu Ido, Minoru Tagami

Production Engineering Center, IHI Corporation, 1 Shin-Nakaharacho, Isogo-ku, Yokohama 235-8501, Japan

Takuya Ito, Hirokatsu Nakagawa

Power Plant Division, IHI Corporation, 3-1-1 Toyosu, Koto-ku, Tokyo 135-8710, Japan

Ryota Uemichi

Power Plant Division, IHI Corporation, 5292 Aioi, Aioi-shi, Hyogo 678-0041, Japan

J. Pressure Vessel Technol 129(4), 713-718 (Jul 14, 2006) (6 pages) doi:10.1115/1.2767364 History: Received February 14, 2006; Revised July 14, 2006

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.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic image of the scattering inside materials

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Figure 2

(a) The used probe characteristic and (b) the frequency spectrum

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Figure 3

(a) Schematic illustration of the probe scanning and (b) an example of the image data

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Figure 4

The result for the aborted specimen (650°C, 58.8MPa, 3449h, 60.1%): (a) a cross sectional picture, (b) an ultrasonic test result, and (c) a magnified picture of the circled region

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Figure 5

The result of the B-scan method for the continuous creep test specimen (650°C, 66MPa)

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Figure 6

(a) A cross sectional picture of the ruptured specimen, (b) an ultrasonic test result after rupturing, and (c) a magnified picture at region A

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Figure 7

Correlation between averaged scattered ultrasound parameters and life consumption

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Figure 8

Measurement under field conditions

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