Method of assessing faults in metal tubes having internal helica

Details Method of assessing faults in metal tubes having internal helica Method of assessing faults in metal tubes having internal helica

1991-05-24

1993-07-27

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73602, 73900, 73622, G01N 2924, G01N 2910

Patent

active

052302474

ABSTRACT:
A method for the detection and evaluation of faults existing on the walls of metal tubes having internal helical ribs includes for each fault signal received by an ultrasonic emitter-receiver ER, the length of the to-and-fro travel completed by the ultrasonic beam corresponding to the signal is determined and after the amplitude of the signal has been compared with a specific threshold, a correction is applied to one of the terms of the comparison, taking into account the length of travel completed by the signal.

REFERENCES:
patent: 4016750 (1977-04-01), Green
patent: 4056971 (1977-11-01), van Valkenburg et al.
patent: 4098130 (1978-07-01), Coffey et al.
patent: 4145741 (1979-03-01), Nappin
patent: 4487072 (1984-12-01), Livingston
patent: 4599900 (1986-07-01), Friedman
Patent Abstracts of Japan, vol. 8, No. 1 (P-246) [1438], Jan. 6, 1984; & JP-A-58 165 073 (Mitsubishi) Sep. 30, 1983.

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