Apparatus for controlling level of cryogenic liquid

Details Apparatus for controlling level of cryogenic liquid Apparatus for controlling level of cryogenic liquid

1995-12-08

1997-09-30

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

With measuring

73295, 137392, F17C 1302

Patent

active

056716036

ABSTRACT:
An apparatus for controlling level of cryogenic liquid in a vessel includes a transfer duct to a pressure supply tank. Pressure pulses are applied to the tank at one rate when the level is below a primary sensor in the vessel, and at a lower rate when the level is above the sensor, so as to compensate for intrinsic declination of the level. At startup a constant pressure is applied to the tank until the level reaches a lower sensor, and a relief valve over the tank is opened when the level overshoots to an upper sensor. Turbulence in the vessel is reduced by a pair of coaxial baffles at the liquid inlet to the vessel, and by a housing with tubular extensions enveloping the sensors.

REFERENCES:
patent: 4135548 (1979-01-01), Sears
patent: 4744222 (1988-05-01), Murai
patent: 5293750 (1994-03-01), Tamura et al.

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