Liquid seal vent

Details Liquid seal vent Liquid seal vent

1986-08-29

1988-09-27

Rivell, John

Fluid handling

With liquid valves or liquid trap seals

Liquid seal in liquid flow line; flow liquid forms seal

13724733, 1372511, 137253, F16K 1310

Patent

active

047734418

ABSTRACT:
The subject of this invention is a liquid seal vent, identified further in this specification as a "device", for use on a gas-blanketed liquid storage tank in safety-related applications where, due to safety reasons, the "device" must be functional even after it is hit by an external missile. The external missle is understood to be an airborne object; such as a telephone pole, piece of a ruptured pipe, or other objects which are routinely considered in the design of safety-related installations such as nuclear power plants.
The "device" contains sealing liquid, which is same or similar as the liquid in the tank. Besides providing a liquid seal, which is automatically maintained by a level control valve, the "device" automatically maintains the liquid in the tank's overflow pipe liquid seal.
The "device" automatically relieves the overpressure or vacuum in the tank and is specially designed to minimize the magnitude of vacuum that can develop inside the tank.
The weight of the "device" can be supported by an external hanger to reduce the load on the tank's roof.

REFERENCES:
patent: 266485 (1882-10-01), Lightbody
patent: 270034 (1883-01-01), Edwards
patent: 1371866 (1921-03-01), Crompton
patent: 1651051 (1927-11-01), Wiggins
patent: 2747601 (1956-05-01), Quist
patent: 3721429 (1973-03-01), Young
patent: 3833014 (1974-09-01), Scheetz

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