Measuring and testing – With fluid pressure – Leakage
Patent
1989-04-19
1991-02-19
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
340605, G01M 332
Patent
active
049932560
ABSTRACT:
In order to accurately conduct a leakage test in a short time, an initial pressure higher than a test pressure is first supplied into a hollow object to be tested. Then, part of the pressure within the object is relieved to decrease the temperature within the object to the ambient temperature so that the pressure within the object can be stabilized at the test pressure. Then, a variation in the pressure within the object is detected to determine whether there is any leakage in the object. In the case where a negative pressure is utilized, an initial pressure lower than the test pressure is first supplied into the object, and then part of the pressure within the object is relieved by introducing the ambient air into the object, to increase the temperature within the object to the ambient temperature so that the pressure within the object can be stabilized at the test pressure. Then, a variation in the pressure within the object is detected to determine whether there is any leakage in the object.
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patent: 3504528 (1970-04-01), Weinberg et al.
patent: 3546923 (1970-12-01), Fletcher et al.
patent: 3839900 (1974-10-01), Fukuda
patent: 3931731 (1976-01-01), Fukuda
patent: 4078421 (1978-03-01), Gastaldo et al.
patent: 4126034 (1978-11-01), Conrad
patent: 4670847 (1978-06-01), Furuse
Kabushiki Kaisha Fukuda
Williams Hezron E.
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