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TECHNICAL PAPERS

Guided Wave Resonance Tuning for Pipe Inspection

[+] Author and Article Information
James Barshinger

Krautkramer, Lewistown, PA 17044

Joseph L. Rose

Engineering Science and Mechanics Department, The Pennsylvania State University, University Park, PA 16802e-mail:jlresm@engr.psu.edu

Michael J. Avioli

FBS, Inc., State College, PA 16801

J. Pressure Vessel Technol 124(3), 303-310 (Jul 26, 2002) (8 pages) doi:10.1115/1.1491580 History: Received April 27, 2002; Online July 26, 2002
Copyright © 2002 by ASME
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References

Figures

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(a) End-on view of pipe showing location of seven-hole cluster; (b) view of 15-element array
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Gated RF waveforms from hole (left) and seven-hole cluster (right); medium gray bars are peak-to-peak values in the “hole” gate and the darker bars are peak-to-peak values in the “cluster” gate (on the right and left sides of the RF waveforms, respectively)—(a) frequency range (100, 375) kHz; (b) frequency range (400, 675) kHz
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Amplitude versus frequency distribution of echoes from seven-hole cluster
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Amplitude versus frequency distribution of echoes from lone hole
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Test results for a clean and coated pipe with a transverse notch of 5% cross-sectional area using the L(0,2) mode at 190 kHz for inspection. The upper waveforms show the defect and back wall results for an equivalent instrument gain to demonstrate the attenuation difference between clean and coated test samples. The lower waveforms show the result when the instrument gain is adjusted to bring the notch to 80% of full screen height to demonstrate the difference in signal to noise of the test for clean and coated test samples. Despite the coating, excellent results are obtained.
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Test results for a clean and coated pipe with a transverse notch of 5% cross-sectional area using the L(0,3) mode at 630 kHz. The upper waveforms show the defect and back wall results for an equivalent instrument gain to demonstrate attenuation differences between clean and coated test samples. The lower waveforms show the result when the instrument gain is adjusted to bring the notch to 80% full screen height to show the difference in signal to noise of the test for clean and coated test samples. Poor results are obtained because of the coated pipe and improper mode and frequency selection.
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Test results for a clean and coated pipe with a transverse notch of 5% cross-sectional area using the L(0,3) mode at 740 kHz for inspection. The upper waveforms show the defect and back wall results for an equivalent instrument gain to demonstrate the attenuation difference between clean and coated test samples. The lower wave-forms show the result when the instrument gain is adjusted to bring the notch to 80% of full screen height to demonstrate the difference in signal to noise of the test for clean and coated test samples. Despite the coating, excellent results are obtained.
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Schematic representation of a multilayer hollow cylinder
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Phase velocity and attenuation dispersion curves for a 4-in. schedule 40 steel pipe, coated with .006 in. of bitumen, showing the first six longitudinal modes of propagation
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Schematic of experimental arrangement showing hole and cluster locations relative to the ensemble exit point of the array
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Matec™ tone-burst pulser/receiver shown with test pipe
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(a) Round bottom-hole defect (the diameter is 0.375 in. and the depth is 0.25 in.); (b) seven-hole cluster defect

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