Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Patent
1977-05-09
1978-05-23
Cohan, Alan
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
141 52, 137587, 220 85VR, 220 85VS, 62 54, 62 55, B67D 504
Patent
active
040905250
ABSTRACT:
An automatic pump-out for an underground vapor line drop-out tank used at gasoline service stations and related locations. Condensed gasoline vapors and gasoline (liquid) which collect in gasoline service station vapor recovery systems flow by gravity through a vapor line to an underground drop-out tank. An underground storage is located adjacent the drop-out tank. A fill pipe extends from the surface into the storage tank and a discharge pipe connects the storage tank to the surface gasoline pumps. The drop-out tank and storage tank are provided with vent lines. The storage tank contains a vertically positioned pipe, having an open lower end and a closed upper end, extending from the top to adjacent the bottom thereof. A tube connects the bottom of the drop-out tank to the top of the vertically positioned pipe. The tanks are arranged such that when the storage tank is filled the difference in the level of liquid in the vertical pipe and the level of the liquid in the storage tank is equal to the height of the liquid in the drop-out tank. As liquid is withdrawn from the storage tank the dropping liquid column in the vertical pipe lowers the pressure in the vapor space in the vertical pipe thereby drawing liquid up the tube between the drop-out tank and the storage tank. When the level of liquid in the storage tank has dropped sufficiently to create a vacuum higher than the lift required in the tube, flow of liquid will commence from the drop-out tank and continue into the vertical pipe in the storage tank until the drop-out tank is empty without additional lowering of the liquid level in the storage tank.
REFERENCES:
patent: 3672180 (1972-06-01), Davis
patent: 3815327 (1974-06-01), Viland
Cohan Alan
Exxon Research & Engineering Co.
Schneider John S.
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