Leak detection system

Measuring and testing – With fluid pressure – Leakage

Patent

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G01M 332

Patent

active

041576560

ABSTRACT:
A system is disclosed for detecting the leakage of fluid from a container by measuring the decay of an initial pressure input. The system employs an axially displaceable piston having a first surface exposed to fluid pressure within the container, and a second surface opposed to the first surface, having a first portion exposed to a reference gas pressure, and a second portion not so exposed. A gas jet has an inlet connected to a pressure sensing source and a sensing gas pressure detector with an outlet proximate to the second portion of the second surface of the piston. Changes in the relative magnitude of the fluid pressure within the container with respect to the reference gas pressure will cause the piston to alternately block and unblock the outlet of the gas jet, producing a low pressure gas signal. This device is termed the "monitor". A pneumatic signal amplifier is connected between the gas jet and the signalling device, having a compound valve mechanism which sets a threshold below which low level noise pressure fluctuations in the sensing gas pressure will be ignored, but above which valid sensing pressures will cause an abrupt output high pressure signal to be generated. The valving action also causes an abrupt discontinuation of the signal immediately below the threshold set. This device is termed the "amplifier". Several embodiments of the invention are described.

REFERENCES:
patent: 2855777 (1958-10-01), Garrett
patent: 3717037 (1973-02-01), Buddecke
patent: 4012945 (1977-03-01), Bergstrand

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