Measuring and testing – With fluid pressure – Leakage
Patent
1983-11-29
1987-12-01
Richman, Barry S.
Measuring and testing
With fluid pressure
Leakage
73 492, 422 83, 436 3, 436 56, G01M 320
Patent
active
047095776
ABSTRACT:
An apparatus and method for detecting leaks from underground gasoline storage tanks and the like by routine or periodic soil samples tested for a particular tracer. A fluorinated halocarbon compound tracer having a boiling point less than that of gasoline is slowly dispensed within the gasoline, natural gas, or the like in the tank. A sampling pipe having a plurality of apertures therein is also buried in selected locations in the vicinity of the tank, and samples of the soil gas are pumped from the pipe and supplied to a Nafion water separator prior to analysis by gas chromatographic techniques. If a leak in the tank should occur, the tracer will exit with the leaking gasoline, quickly vaporize, and travel rapidly by molecular diffusion in all directions. Elements of the tracer will therefore be detected in the soil gas pumped from the sample pipe using standard gas chromatography techniques, indicating that a leak exists in the tank.
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Randall et al.; Suitability of Fluorocarbons as Tracers in Ground Water Resources Evaluation; Selected Water Resources Abstracts; PB277488; 11/77.
Ferger et al.; Demonstration of a Long-Range Tracer System Using Perfluorocarbons; National Technical Information Services; 1/81.
Gzybowski Michael S.
Richman Barry S.
Tracer Research Corporation
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