Method of detecting creep swelling

Details Method of detecting creep swelling Method of detecting creep swelling

1990-04-10

1991-07-30

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73622, 73597, 364502, 367127, G01N 2900

Patent

active

050351435

ABSTRACT:
A method is disclosed for ultrasonically detecting creep swelling in tubular members such as fossil utility steam lines and headers. Ultrasonic surface waves (34) are propagated around the pipe (10) in a circumferential direction. The transit time (.DELTA.T) is measured by using the pulse overlap technique with an oscilloscope (24). Circumferential dimension is obtained by multiplying the transit time (.DELTA.T) by the known Raleigh velocity of sound in the tubular member.

REFERENCES:
patent: 4049954 (1977-09-01), Da Costa Viera et al.
patent: 4420980 (1983-12-01), Dunemann et al.
patent: 4567747 (1986-02-01), Matay
"An Integrated Circuit Pulse Echo Overlap Facility for Measurement of Velocity of Sound" by A. G. Hellier, S. B. Palmer, and D. G. Whitehead, (Journal of Physics E, vol. 8, No. 5, pp. 352-354, May 1975).

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