Measuring and testing – Vibration – By mechanical waves
Patent
1991-06-04
1993-09-14
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73622, 73634, G01N 2908, G01N 2920
Patent
active
052438627
ABSTRACT:
A method and apparatus for distinguishing between hydrogen damage in the wall of a boiler tube, and surface damage on the inside surface of the tube, comprises a pair of transducers which are spaced on the outer surface of the tube and which apply a refracted shear ultrasonic wave through a chord of the tube with a beam angle that is calculated from the outside radius and wall thickness of the tube. The transducers are first applied to an undamaged tube and an instrument connected to the transducers is adjusted to 80% of full screen height. The same transducers are then, applied to a suspected boiler tube. Any attenuation of the initially high amplitude below 12 dB indicates hydrogen damage as opposed to inner surface damage which has been found to produce a far lower attenuation.
REFERENCES:
patent: 4127035 (1978-01-01), Vasile
patent: 4289030 (1981-09-01), Alers et al.
patent: 4307612 (1981-01-01), Eisley et al.
patent: 4320661 (1982-01-01), Peterson et al.
patent: 4593568 (1986-01-01), Telford et al.
patent: 4685334 (1987-08-01), Latimer
patent: 4890496 (1990-01-01), Birring et al.
Latimer, P. J., D. M. Stevens, and T. P. Sherlock, "ANDE Method for Hydrogen Damage Detection in Boiler Tubes," Proceedings of the EPRI Conference on Life Extension and Assessment of Fossil Plants, Washington, D.C., Jun. 2-4, 1986, EPRI C5-5208, pp. 1061-1076.
Latimer, P. J. and H. L. Whaley, "Electromagnetic Transducers for Generation and Detection of Ultrasonic Waves," Acousto-Ultrasonics, Edited by John C. Duke Jr., Plenum Publishing Corporation, 1988, (Presented at the Symposium on Acousto-Ultronics), Jul. 12-15, 1987, Virginia Polytechnic and State University, Blackburg, Va.
Birring, A. S., D. G. Alcazar, J. J. Hanley and S. M. Gehl, "Ultrasonic Assessment of Creep and Hydrogen Damage in Fossil Plant Components", Proceedings of the Second EPRI Fossil Plant Inspection Conference, Nov. 29-Dec. 1, 1988 San Antonio, Tex.
Birring, A. S., D. G. Alcazar, J. J. Hanley, and S. Gehl, "Ultrasonic Detection of Hydrogen Damage", Materials Evaluation 47 Mar. 1989, pp. 345-350.
Sloat, Kim A., and Doug Jacks, "Inspection for Hydrogen Damage in Waterwall Tubes Using Ultrasonic Techniques," Proceedings of the EPRI Conference on Failures and Inspections of Fossil-Fired Boiler Tubes, EPRI CS-3272, Bal Harbor, Florida, Apr. 1983.
B. W. Maxfield, A. Kuramoto, and J. K. Hulbert, "Evaluating EMAT Designs for Selected Applications", Materials Evaluation, 45 Oct. 1987 pp. 1166-1183.
Edwards Robert J.
Finley Rose M.
Kalka Daniel S.
Matas Vytas R.
The Babcock & Wilcox Company
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