Measuring and testing – With fluid pressure – Leakage
Patent
1990-04-04
1991-08-20
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73592, 73 405R, 340605, G01M 308
Patent
active
050404091
ABSTRACT:
An acoustic sensor and associated electronic circuitry are used to determine when a catastrophic leak (as e.g. may be caused by a sprinkler nozzle being broken off a pipe) occurs in a sprinkling system. When a catastrophic leak is detected, an alarm signal is generated and a shutoff valve may be actuated in order to prevent loss of fluid and possible damage that can occur due to localized high flow of the fluid that is being sprayed. The acoustic sensor responds to a frequency range of acoustic signals that encompasses the generally low frequency signals generated by the relatively unconstrained flow of fluid through a pipe, as well as the higher frequency signals generated by flow of fluid through one or more nozzles. Electronic signal processing means are employed to form a ratio of the acoustic power in two different frequency regions and to generate an alarm signal when flow generates an excess of low frequency acoustic power.
REFERENCES:
patent: 4201092 (1980-05-01), Dau
patent: 4428237 (1984-01-01), Zeger et al.
patent: 4609994 (1986-09-01), Bassim et al.
patent: 4736763 (1988-04-01), Britton et al.
patent: 4796466 (1989-01-01), Farmer
Francos William
Kiewit David A.
Williams Hezron E.
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