Gordon C Potter
Engineers at Appletree, Houston, TX

4058148, Nov 15, 1977

Mar 18, 1976

5/668549

Gordon C. Potter - Houston TX

Exxon Research & Engineering Co. - Linden NJ

B65B 326

141198

In the delivery of bulk gasoline to an underground storage tank assurance that the vapor recovery hose is properly connected is provided by sensing of an excess vacuum in the delivery truck tank. Such vacuum occurs when air and/or gasoline vapor is not permitted to replace the gasoline drained from the truck tank. To prevent air from entering the truck tank when the vapor hose is not properly connected to both the truck tank and the storage tank (1) a complete dry break coupling is employed at the vapor hose connection to the underground tank so that vapor cannot be displaced from the storage tank nor can air enter the vapor hose if that connection is not made and (2) a dry break coupling is used only on the truck side of the vapor hose connection to the truck so that air cannot enter the truck tank unless that connection is made. To prevent discharge of gasoline from the truck tank when the vapor hose is not properly connected to both the truck tank and the storage tank a vacuum sensor, similar to that used for automatic service station automobile refueling nozzles, is mounted on the truck vapor line near the connection of the truck vapor line to the vapor hose. The vacuum sensor is attached to a standard air control valve on the air supply line in series with bottom dump (emergency) valves in compartments of the truck tank.

4090525, May 23, 1978

May 9, 1977

5/795057

Gordon C. Potter - Houston TX

Exxon Research & Engineering Co. - Linden NJ

B67D 504

137171

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.