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US 4,890,983 AGranted
Above-ground storage system
AssigneePacific Environmental Industries
InventorsStuart G. Solomon, David C. Whitman
Life of this patent
Estimating the term…
Abstract
An above-ground storage system, especially for use with hazardous materials is disclosed. The system includes a first inner tank and a second outer tank. An air-operated diaphragm pump is used to fill the tank. In order to preent overfilling of the tank and, therefore environmental contamination, a valve is installed in the air supply line to the air pump. The valve is operated by a float within the tank. When the float becomes submerged in liquid the valve is closed by an arm connected to the float.
Claims10
An above-ground waste oil storage system comprising:
- (a) an outer tank, said outer tank having an open top;
- (b) a substantially closed inner tank, said inner tank placed within said outer tank, said inner tank further comprising a tank oil inlet port, a tank oil discharge port, a vent port, and a level detection port, all of said ports in a top surface of said inner tank, said inner tank and said outer tank forming an annulus between said inner and said outer tanks;
- (c) an air-operated diaphragm pump having a system oil inlet, a pump oil outlet, and a pump air inlet, said oil outlet connected to said tank oil inlet port;
- (d) a disposal pipe extending upwards from said tank oil discharge port and downwards into said inner tank;
- (e) a float valve assembly, said float valve assembly comprising:
- (i) a float in said inner tank, said float having an arm extending through said level detection port;
- and
- (ii) an air shut-off valve in said pump air inlet, said air shut-off valve positioned in an open position by said arm when said float is not immersed in oil, said valve in a closed position when said float is immersed in oil;
- and
- (f) a substantially frustroconical cover over said annulus.
7 more elements
Apparatus for preventing entry of a liquid into the environment comprising:
- (a) a first inner tank;
- (b) a second outer tank, said inner tank contained within said outer tank, said outer tank having a volume greater than a volume of said inner tank, said inner tank and said outer tank forming an annulus therebetween;
- (c) an air-operated pump having a liquid inlet, a liquid outlet, and an air supply line, said liquid outlet discharging into said inner tank through a tank liquid inlet;
- (d) a float valve in said air supply line, said float valve in a closed position when a float connected thereto and contained within said inner tank is in contact with a liquid and said inner tank contains a first volume, and said valve moving to an open position when said tank contains a second volume of liquid, said second volume less than said first volume;
- (e) a float arm, said float arm connecting said float to said float valve in said supply line, said arm extending into said tank through a float arm aperture;
- and
- (f) an inner tank discharge aperture, said float arm aperture, said inner tank liquid inlet, and said discharge aperture on said inner tank above said float.
4 more elements
Apparatus for preventing entry of a liquid into the environment comprising:
- (a) a first inner tank;
- (b) a second outer tank, said inner tank contained within said outer tank, said outer tank having a volume greater than a volume of said inner tank, said inner and said outer tank forming an annulus therebetween;
- (c) an air-operated pump having a liquid inlet, a liquid outlet, and an air supply line, said liquid outlet discharging into said inner tank through a tank liquid inlet;
- (d) a float valve in said air supply line, said float valve in a closed position when a float connected thereto and contained within said inner tank is in contact with a liquid and said inner tank contains a first volume, and said valve moving to an open position when said tank contains a second volume of liquid, said second volume less than said first volume;
- and
- (e) said float valve further comprising a first and a second disc, said first and said second disc containing at least a first and a second aperture, respectively, said first and said second disc rotatable from a first position in which said first aperture is in alignment with said second aperture and permits air to flow to said pump, to a second position in which said first and said second aperture are not in alignment and do not permit air to flow to said pump, said discs rotated by said float and in said first position when said float is not in contact with a liquid and in said second position when said float is in contact with a liquid.
3 more elements
Apparatus for preventing entry of a liquid into the environment comprising:
- (a) a first inner tank;
- (b) a second outer tank, said inner tank contained within said outer tank, said outer tank having a volume greater than a volume of said inner tank, said inner and said outer tank forming an annulus therebetween;
- (c) an air-operated pump having a liquid inlet, a liquid outlet, and an air supply line, said liquid outlet discharging into said inner tank through a tank liquid inlet;
- (d) a float valve in said air supply line, said float valve in a closed position when a float connected thereto and contained within said inner tank is in contact with a liquid and said inner tank contains a first volume, and said valve moving to an open position when said tank contains a second volume of liquid, said second volume less than said first volume;
- and
- (e) a cover, said cover mounted to said outer tank and substantially in the shape of a truncated cone, said cover covering at least said annulus.
3 more elements
Dependencies are inferred from the claim text.