Estimation of leakage rates using voltage measurements

Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device

Reexamination Certificate

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C324S693000, C324S713000

Reexamination Certificate

active

07141982

ABSTRACT:
A current is injected in the vicinity of a liquid-containment facility of interest to create a measurable electrical potential field in the ground underlying the site. Voltage is measured at each of a plurality of electrodes and plotted as a function of time. The rate of change of the voltages measured at each electrode was found to be proportional to the flow rate of any leak from the facility. Accordingly, the monitoring system is calibrated with artificially imposed leaks flowing at various rates and the resulting information is used to estimate the flow rate of actual leaks on the basis of the slope of the potential plot recorded by any given electrode over time. In the preferred embodiment of the invention, the flow rates so calculated are averaged to produce an estimate of the rate of leakage.

REFERENCES:
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patent: 4755757 (1988-07-01), Cooper
patent: 4947470 (1990-08-01), Darilek
patent: 5168748 (1992-12-01), Flora, Jr. et al.
patent: 5184083 (1993-02-01), Groover
patent: 5357202 (1994-10-01), Henderson
patent: 5661406 (1997-08-01), Daily et al.
patent: 6331778 (2001-12-01), Daily et al.
patent: 6722207 (2004-04-01), Feller

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