Measuring and testing – With fluid pressure – Leakage
Patent
1989-01-26
1991-09-10
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73 405R, 436 3, G01M 320
Patent
active
050463535
ABSTRACT:
An apparatus and method for detecting leaks in underground fluid pipes. Detection of a leak is achieved by introducing a liquid phase tracer into the fluid within the underground pipe, which volatilzes to a gas phase when the fluid leaks from the underground fluid pipe. A permeable tube is buried in the soil in a position above an underground fluid transfer pipe. At least one end of the permeable tube is terminated in a recess vault for access to the end of the permeable tube and sampling soil gases from the permeable tube. Should any fluid leak occur in the underground fluid transfer pipe, the escaping tracer escapes in liquid form and, upon encountering free air in the subsurface soil, vaporizes to the gas phase and diffuses through the soil surrounding the underground fluid transfer pipe and into the permeable tube for collection and analysis.
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Niaki, S., et al. Underground Tank Leak Detection Methods a State-of-the-Art Review; 1986.
Rosenbaum David G.
Tracer Research Corporation
Williams Hezron E.
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