Line leak test apparatus measuring rate of pressure change in a

Details Line leak test apparatus measuring rate of pressure change in a Line leak test apparatus measuring rate of pressure change in a

1993-12-07

1995-04-18

Voeltz, Emanuel T.

Boots, shoes, and leggings

364510, 364550, 73 1H, 73 405R, 73708, 73756, 222 52, G01M 308, G06F 1900

Patent

active

054084202

ABSTRACT:
A line leak test probe for use on a liquid conduit. A pressure transducer is mounted in mechanical contact with the liquid in the conduit and a temperature transducer is mounted in thermal contact with the liquid. The transducers provide signals to a microprocessor-based circuit which includes a timer. Software stored in the microprocessor analyzes the time rate of change of the pressure to determine if there is a leak. Normally a sequence of three tests are performed: a catastrophic test, a gross test, and a precision test. The catastrophic test exits to the gross test if the rate of change of the pressure is less than a first rate, and the gross test exits to the precision test if the rate of change is less than a second rate which is less than the first rate. The precision test normally cycles until the pressure drops below 4 psi, and then outputs a leak signal if the pressure drops to below 3 psi in 12 minutes or less. If the temperature change during the test is sufficient to account for the pressure change, or the temperature is out of a range where it can be measured, the test aborts without outputting a leak signal.

REFERENCES:
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patent: 4658986 (1987-04-01), Freed et al.
patent: 4675834 (1987-06-01), Furuse
patent: 4752897 (1988-06-01), Zoeller et al.
patent: 4835717 (1989-05-01), Michel et al.
patent: 4841456 (1989-06-01), Hogan, Jr. et al.
patent: 4949290 (1990-08-01), Pike et al.

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