Tank depletion flow controller

Details Tank depletion flow controller Tank depletion flow controller

1975-07-01

1976-10-26

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

73302, F16K 3100

Patent

active

039878155

ABSTRACT:
A flow control system includes two bubbler tubes installed at different levels within a tank containing such as radioactive liquid. As the tank is depleted, a differential pressure transmitter monitors pressure differences imparted by the two bubbler tubes at a remote, shielded location during uniform time intervals. At the end of each uniform interval, balance pots containing a dense liquid are valved together to equalize the pressures. The resulting sawtooth-shaped signal generated by the differential pressure transmitter is compared with a second sawtooth signal representing the desired flow rate during each time interval. Variations in the two signals are employed by a control instrument to regulate flow rate.

REFERENCES:
patent: 2012351 (1935-08-01), Riney et al.
patent: 2604778 (1952-07-01), Marquardt
patent: 2613535 (1952-10-01), Born
patent: 2899969 (1959-08-01), Kirby
patent: 3012373 (1961-12-01), Willis
patent: 3174504 (1965-03-01), Rosenbrock et al.
patent: 3200971 (1965-08-01), Trethewey
patent: 3271993 (1966-09-01), Whitson
patent: 3380463 (1968-04-01), Trethewey
patent: 3470902 (1969-10-01), Hackman
patent: 3499580 (1970-03-01), Smith
patent: 3532956 (1970-10-01), Simon
patent: 3552428 (1971-01-01), Pemberton

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