Measuring and testing – Vibration – By mechanical waves
Patent
1981-10-19
1984-08-28
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73644, G01N 2904
Patent
active
044676549
ABSTRACT:
A method of ultrasonic flaw detection of a pipe, worth particularly for instance for a heater pipe as is used for catalytic gas reforming with steam. A transmitter probe and a receiver probe are disposed on the pipe outer surface with suitable spacing one from the other both in axial or longitudinal direction and in peripheral direction of the pipe. The transmitter probe launches ultrasonic radiation under proper angle of incidence upon the pipe outer surface at the point of entering material of the pipe, to be refracted under a particular angle of refraction so that it may then pass through the material of the pipe straight to another point upon the pipe outer surface. The receiver probe receives the ultrasonic radiation transmission echo. Flaw in the material of the pipe is detected from fluctuation of the echo, as seen upon scanning the pipe surface by moving the transmitter and receiver probes.
REFERENCES:
patent: 3248933 (1966-05-01), Stebbins
patent: 3302453 (1967-02-01), Wood et al.
patent: 3930404 (1976-01-01), Ryden, Jr.
patent: 4041773 (1977-08-01), Hauldren et al.
N. P. Aleshin et al., "Signal-to-Noise Enhancement in the Ultrasonic Inspection of Pipe Welds", Soviet Journal of Nondestructive Testing, vol. 11, No. 1, pp. 99-102, Jan.-Feb. 1975.
Murakami Shinichi
Sugitani Junichi
Yoshimoto Teruo
Greigg Edwin E.
Kreitman Stephen A.
Kubota Ltd.
Osaka Gas Kabushiki Kaisha
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