Measuring and testing – With fluid pressure – Leakage
Patent
1993-03-12
1994-12-27
Noland, Thomas P.
Measuring and testing
With fluid pressure
Leakage
222 52, 364558, G01M 316
Patent
active
053754549
ABSTRACT:
A microprocessor controlled timer is installed in a petroleum service station product dispensing system that includes a pump relay, a pump, a dispenser, and a leak detection monitor. The timer activates pump relays to pressurize a liquid product line that runs from a tank to the dispenser at predetermined intervals to compensate for thermal contraction during product line leakage testing. Prior to activating pump relays, the timer has circuitry to determines if product is currently being dispensed. If product is being dispensed, the timer waits until dispensing has halted before activating pump relays to pressurize the product line. Also prior to activating pump relays, the timer has circuitry to determine if pump operation should be inhibited and if so halts before activating pump relays. Optical isolation is used between the timer and pump relays and a dispenser switch.
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Installation And Operation Instructions Pollulert Control Box FD406. May 18, 1992.
E.P.A. Regulation AO C.F.R. 280.40-280.45.
Andrejasich Raymond J.
Kidd Roy E.
Emerson Electric Co.
Meyer Robert F.
Noland Thomas P.
Roskos Joseph W.
Waldkoetter Eric R.
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