Gas leakage testing method

Details Gas leakage testing method Gas leakage testing method

1993-09-08

1995-02-07

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

G01M 320

Patent

active

053867173

ABSTRACT:
A gas leakage testing method to be applied to a gas leakage testing system is provided to effectively detect whether or not any leakage points exist in a testing specimen. In a gas leakage test, the testing specimen is stored in a testing container in an air tight manner, and then, a leakage detector searches the leakage point in the testing specimen by use of probe gas (i.e., helium gas). However, due to the existence of the probe gas component in the atmospheric air, a background noise occurs, and it deteriorates the detection precision of the leakage detector. In order to avoid such drawback, a vacuum evacuation is carried out so as to reduce an internal pressure of the testing container to a predetermined low pressure (preferably, ranging from 500 hPa to 1 hPa), and then, the testing container is purged with substitute gas (e.g., nitrogen gas). The above-mentioned vacuum evacuation process and gas substitution process are repeatedly carried out by a predetermined number of times which depends on the above predetermined low pressure. Thereafter, density of the probe gas existing in the testing container is detected so as to obtain a background value representing the background noise. Then, the probe gas is introduced into the testing specimen, and the density of the probe gas in the testing container is detected again so as to determine whether or not the probe gas has leaked from the testing specimen on the basis of the background value.

REFERENCES:
patent: 3186214 (1965-06-01), Roberts
patent: 3762212 (1973-10-01), Morley et al.
patent: 4257439 (1981-03-01), Mayeaux
patent: 4754638 (1988-07-01), Brayman et al.
patent: 5214412 (1993-05-01), Gavlak et al.

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