Measuring and testing – Vibration – By mechanical waves
Patent
1992-06-01
1994-11-01
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73622, 73634, 73643, G01N 2908, G01N 2926
Patent
active
053598989
ABSTRACT:
A method and apparatus for use in confirming hydrogen damage in a boiler tube comprises a pair of electromagnetic acoustic transducer coils which are mounted for movement toward and away from each other. An electromagnet produces pulses that generate acoustic beams across a chord and within the wall thickness of the boiler tube. For adapting to boiler tubes of different outside diameters, the transducers coils are mounted on a resilient member so that the coils can be pressed against the outer surface of coils having a variety of outside diameters. The angle of the acoustic beam between the coils must also be adjusted, however, and this is done by changing the frequency of energy applied to the coils.
REFERENCES:
patent: 3850028 (1974-11-01), Thompson et al.
patent: 4127035 (1978-11-01), Vasile
patent: 4289030 (1981-09-01), Alers et al.
patent: 4307612 (1981-12-01), Eisley et al.
patent: 4320661 (1982-03-01), Peterson et al.
patent: 4593568 (1986-04-01), Telford et al.
patent: 4685334 (1987-08-01), Latimer
patent: 4890496 (1990-01-01), Birring et al.
patent: 5085082 (1992-02-01), Cantor et al.
Latimer, P. J., D. M. Stevens, and T. P. Sherlock," A NDE 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-Ultrasonics, Jul. 12-15, 1987, Virginia Polytechnic and State University, Blacksburg, 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.
The Babcock & Wilcox Company
Williams Hezron E.
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