Method of acoustic emission testing of steel vessels or pipeline

Details Method of acoustic emission testing of steel vessels or pipeline Method of acoustic emission testing of steel vessels or pipeline

1981-09-25

1984-01-31

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

376252, G01N 2904

Patent

active

044282362

ABSTRACT:
Method of acoustic-emission testing of a steel component such as a vessel of pipeline especially of primary circulatory loops of nuclear reactor installations wherein the component, on one hand is subjected to a pressure medium, such as water, and, on the other hand, to ultrasonic pulses emitted during deformation development resulting from growth of cracks therein or from leaks and transmitted through the component, which includes detecting and amplifying the ultrasonic pulses with equipment, respectively, formed of test probes, which are disposed so as to determine respective sources of acoustic emission due to differences in transmission time of the ultrasonic pulses through the component, and of electronic amplifiers operatively associated with the test probes, and then feeding a resultant amplified defect signal from the equipment to a display, the equipment being tuned to reception of a frequency band of acoustic-emission spectrum which is above a limiting frequency f.sub.G defined by the relationship: ##EQU1## wherein d is the wall thickness of the component being tested.

REFERENCES:
patent: 4033179 (1977-07-01), Romrell
patent: 4088907 (1978-05-01), Jones et al.
J. Eisenblatter and P. Jax-"Defect Position-Finding and Leak-Testing of Large Vessels and Pipelines with the Air of Acoustic Emission Analysis", (VGB Power Plant Engineering 56, Jul. 1976, Book 7, p. 456).

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