Disclosed is an assembly including a dump tank disposed near the fill pipe for an underground gasoline storage tank at an automobile service station. The tank is normally isolated by a hand valve and a check valve from communication with the storage tank fill pipe, however, when the storage tank has been filled from a transport vehicle, the gasoline in the fill pipe and the flexible delivery hose may be dumped into the dump tank by opening a manually operated valve. The check valve permits gasoline thus dumped to flow from the dump tank back to the storage tank as gasoline is pumped from the storage tank during normal pump operation of the service station.
This patent specification discloses a system for reducing pollution of soil, water and air due to spillage of liquid hydrocarbons. Such liquids are transferred by gravity flow from a tank truck compartment to a bulk storage tank through a flexible loading hole. The hose is connected to the bulk storage tank pumping system by a ground level connector which is enclosed within an open top box. The bottom plate of a box is tilted to horizontal and forms a cover for an unloading chamber or pot serving as a pump reservoir between the hose connector and the storage tank pump system. The sidewalls of the box extend above and around the hose connector to catch spills or leaks from the gravity fed loading hose when it is connected to, or disconnected from, the pumping system. A sump pot is arranged at the low end of the tilted bottom plate for recovery of any spilled liquid. The box may accommodate from one to several unloading headers with a single sump pot. Liquid in the sump pot is drained to a slop tank for recovery or disposal. A vapor recovery system is connected to the sump pot drain line and through a gas vent valve to the vapor space at the top of each unloading chamber to prevent air pollution also.
An assembly for controlling overfill of liquid to an underground storage tank during a filling operation comprises a dump tank, a fill tube positioned within the dump tank, piping with valve and a cover. The fill tube within the dump tank is encased with a shrink-fitting covering which extends from the bottom portion of the dump tank to ensure a liquid tight overfill assembly.
An overfill assembly for use with storage tanks, especially underground gasoline storage tanks. The overfill assembly comprises a dump tank with a fill pipe mounted therein. The fill pipe extends through the dump tank's bottom and is in communication with the storage tank. A removable center-point compression sealing lid member for the dump tank allows for ready access to the fill pipe. A valve mechanism in the dump tank allows for controlled emptying of spilled liquid in the dump tank to the storage tank.
An overfill and spillage protection device for capturing fuel spilled from a tank touch supply hose or the fill pipe of an underground fuel storage tank takes the form of a tubular reservoir having an axially flexible bellows shaped side wall. Forces induced by freezing or thawing of the ground in which the reservoir is embedded which would apply strain to the coupling between the reservoir and fill pipe are absorbed by the flexing action of the bellows shaped reservoir. A rigid tubular skirt slidably encloses the bellows portion to prevent concrete or dirt from packing into the concave regions of the bellows.
