System for continuously monitoring for leaks in underground stor

Details System for continuously monitoring for leaks in underground stor System for continuously monitoring for leaks in underground stor

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.

REFERENCES:
patent: 3468796 (1969-09-01), Noll et al.
patent: 3598536 (1971-08-01), Christensen
patent: 3749646 (1973-07-01), Pirt
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patent: 4181702 (1980-01-01), Watson
patent: 4189938 (1980-02-01), Heim
patent: 4446329 (1984-05-01), Waller
patent: 4501324 (1985-02-01), Sandiford et al.
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.

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