The Invention is an underground storage tank apparatus and method. A buried underground storage tank has a tank sump and a manway defined by a manhole skirt side wall communicating from the surface of the ground to the tank sump. A sediment trap is disposed annularly within the manway and intercepts
The Invention is an underground storage tank apparatus and method. A buried underground storage tank has a tank sump and a manway defined by a manhole skirt side wall communicating from the surface of the ground to the tank sump. A sediment trap is disposed annularly within the manway and intercepts water and sediment flowing down the manhole skirt wall. An inside wall of the sediment trap is in an annular spaced-apart relation with a tank sump perimeter watt, which together define an annular space interior volume that receives water that overtops the sediment trap inside wall and which receives liquid that overtops the tank sump perimeter wall.
대표청구항▼
1. An underground storage tank system apparatus, the apparatus comprising: a. an underground storage tank for containing a liquid, said underground storage tank having a top side;b. a tank sump attached to said top side of said underground storage tank, said tank sump having a sump perimeter wall, s
1. An underground storage tank system apparatus, the apparatus comprising: a. an underground storage tank for containing a liquid, said underground storage tank having a top side;b. a tank sump attached to said top side of said underground storage tank, said tank sump having a sump perimeter wall, said tank sump being located below a surface of a ground;c. a manhole skirt side wall, said manhole skirt side wall having a manhole skirt side wall interior surface, said manhole skirt side wall defining a manway, said manway communicating between said surface of said ground and said tank sump;d. an annular sediment trap, said annular sediment trap defining a trap outside wall, a trap inside wall, a trap bottom, and a trap open top wherein said trap outside wall, said trap bottom and said trap inside wall together define a trap interior volume, said trap interior volume being water-tight, said trap interior volume being in fluid communication with said manway, said manhole skirt side wall interior surface extending into said trap interior volume, whereby a water entering said manway from said surface of said ground enters said trap interior volume through said trap open top;e. said trap inside wall and said sump perimeter wall being in an spaced-apart relation and together defining an annular space, said annular space having an annular space open top and an annular space interior volume, whereby when said water entering said trap interior volume accumulates and overtops said trap interior wall, said water enters said annular space through said annular space open top. 2. An underground storage tank system apparatus, the apparatus comprising: a. an underground storage tank for containing a liquid, said underground storage tank having a top side;b. a sump attached to said top side of said underground storage tank, said sump having a sump perimeter wall, said sump being located below a surface of a ground;c. a manhole skirt side wall, said manhole skirt side wall having a manhole skirt side wall interior surface, said manhole skirt side wall defining a manway, said manway communicating between said surface of said ground and said sump;d. an annular sediment trap, said annular sediment trap defining a trap outside wall, a trap inside wall, a trap bottom, and a trap open top wherein said trap outside wall, said trap bottom and said trap inside wall together define a trap interior volume, said trap interior volume being water-tight, said trap interior volume being in fluid communication with said manway, said manhole skirt side wall interior surface extending into said trap interior volume, said trap inside wall and said sump perimeter wall being in an spaced-apart relation, whereby a water entering said manway from said surface of said ground enters said trap interior volume through said trap open top and a sediment entrained in said water settles from said water and is deposited on said trap bottom;e. said trap inside wall and said sump perimeter wall together define an annular space having an annular space open top and an annular space interior volume, whereby when said water entering said trap interior volume accumulates and overtops said trap interior wall, said water enters said annular space through said annular space open top;f. a drainage medium proximal to said sump and outside of said underground storage tank wherein said sump perimeter wall and said trap inside wall in combination define an opening, said annular space interior volume and said drainage medium being in fluid communication through said opening, whereby when said water in said sediment trap overtops said trap interior wall and enters said annular space interior volume, said water passes through said opening and enters said drainage medium. 3. The underground tank system apparatus of claim 1 wherein said annular space interior volume is water tight and said annular space interior volume defines a second sediment trap, whereby said sediment entrained in said water overtopping said trap interior wall is retained within said second sediment trap. 4. An underground storage tank system apparatus, the apparatus comprising: a. an underground storage tank for containing a liquid, said underground storage tank having a top side;b. a sump attached to said top side of said underground storage tank, said sump having a sump perimeter wall, said sump being located below a surface of a ground;c. a manhole skirt side wall, said manhole skirt side wall having a manhole skirt side wall interior surface, said manhole skirt side wall defining a manway, said manway communicating between said surface of said ground and said sump;d. an annular sediment trap, said annular sediment trap defining a trap outside wall, a trap inside wall, a trap bottom, and a trap open top wherein said trap outside wall, said trap bottom and said trap inside wall together define a trap interior volume, said trap interior volume being water-tight, said trap interior volume being in fluid communication with said manway, said manhole skirt side wall interior surface extending into said trap interior volume, said trap inside wall and said sump perimeter wall being in an spaced-apart relation, whereby a water entering said manway from said surface of said ground enters said trap interior volume through said trap open top and a sediment entrained in said water settles from said water and is deposited on said trap bottom;e. said trap inside wall and said sump perimeter wall together define an annular space having an annular space open top and an annular space interior volume, whereby when said water entering said trap interior volume accumulates and overtops said trap interior wall, said water enters said annular space through said annular space open top;f. a trap drainage pipe, said trap drainage pipe having a first end, said first end of said trap drainage pipe being in fluid communication with said trap interior volume, said trap drainage pipe first end defining a bottom inside surface of said trap drainage pipe, said bottom inside surface being at an elevation greater than said trap bottom, said elevation of said bottom inside surface of said trap drainage pipe being less than said elevation of said trap inside wall, whereby water accumulating in said trap interior volume will overtop said bottom inside surface of said trap drainage pipe and enter said trap drainage pipe prior to overtopping said trap inside wall. 5. The underground tank storage system apparatus of claim 4, the apparatus further comprising a drainage medium outside of said underground storage tank wherein said trap drainage pipe has a perforated portion, said perforated portion being in fluid communication with said drainage medium. 6. The underground tank storage system apparatus of claim 3, the apparatus further comprising: an annular space drainage pipe, said annular space drainage pipe having a first end, said first end of said annular space drainage pipe being in fluid communication with said annular space interior volume, said annular space drainage pipe first end defining a bottom inside surface of said annular space drainage pipe, said bottom inside surface being at an elevation greater than a bottom of said annular space, said elevation of said bottom inside surface of said annular space drainage pipe being less than said elevation of said sump perimeter wall, whereby water accumulating in said annular space interior volume will overtop said bottom surface of said annular space drainage pipe and enter said annular space drainage pipe prior to overtopping said sump perimeter wall. 7. The underground storage tank apparatus of claim 6 wherein said annular space interior volume is liquid tight, said bottom surface of said annular space drainage pipe being at said elevation that is less than said elevation of said trap inside wall, said annular space drainage pipe being unperforated, said annular space interior volume being in fluid communication with an oil-water separator through said annular space drainage pipe, whereby said annular space interior volume defines a secondary containment for a release of said liquid from said tank sump. 8. The underground storage tank apparatus of claim 1 wherein said sediment trap outside wall is defined by said manhole skirt side wall, whereby said sediment trap is integral to said manhole skirt side wall. 9. The underground storage tank apparatus of claim 1 wherein a bottom portion of said manhole skirt side wall is disposed within said trap interior volume, whereby said sediment trap is not integral with said manhole skirt side wall. 10. The underground storage tank apparatus of claim 1 wherein said annular sediment trap is generally circular in horizontal cross section, said trap interior volume and said annular space interior volume being annularly located within said manway. 11. A method for providing an underground storage tank system, the method comprising the steps of: a. providing an underground storage tank for containing a liquid, said underground storage tank having a top side and a tank sump attached to said top side of said underground storage tank, said tank sump having a sump perimeter wall, said tank sump being located below a surface of a ground;b. providing a manhole skirt side wall, said manhole skirt side wall having a manhole skirt side wall interior surface, said manhole skirt side wall defining a manway, said manway communicating between said surface of said ground and said tank sump;c. providing an annular sediment trap, said annular sediment trap defining a trap outside wall, a trap inside wall, a trap bottom, and a trap open top wherein said trap outside wall, said trap bottom and said trap inside wall together define a trap interior volume, said trap interior volume being water-tight, said trap interior volume being in fluid communication with said manway, said manhole skirt side wall interior surface extending into said trap interior volume, whereby a water entering said manway from said surface of said ground enters said trap interior volume through said trap open top, said trap inside wall and said sump perimeter wall being in an spaced-apart relation and together defining an annular space, said annular space having an annular space open top and an annular space interior volume, whereby when said water entering said trap interior volume accumulates and overtops said trap interior wall, said water enters said annular space through said annular space open top. 12. The method of claim 11 wherein said annular space defining an annular space bottom, said annular space bottom being in fluid communication with a drainage medium, said drainage medium being disposed in proximity to said underground storage tank outside of said sump, whereby water overtopping said trap inside wall will enter said annular space and be discharged from said annular space bottom through said drainage medium. 13. The method of claim 12, the method further comprising: providing a trap drainage pipe having a first end and a first end bottom surface, said first end of said trap drainage pipe being in fluid communication with said trap interior volume, an elevation of said first end bottom surface of said trap drainage pipe being less than said elevation of said trap inside wall and greater than said elevation of said trap bottom, whereby water accumulating in said trap interior volume will drain through said drainage pipe and will not overtop said trap inside wall. 14. The method of claim 13 wherein said drainage pipe is perforated and is located within said drainage medium. 15. The method of claim 11 wherein said annular space defines an annular space bottom, said annular space bottom, said sump perimeter wall and said trap inside wall in combination defining a water-tight annular space interior volume, whereby water overtopping said sediment trap inner wall is collected in said second sediment trap and said sediment entrained in said water is collected on said annular space bottom. 16. The method of claim 15, the method further comprising: providing an annular space drainage pipe having a first end and a first end bottom surface, said first end of said annular space drainage pipe being in fluid communication with said annular space interior volume, an elevation of said first end bottom surface of said annular space drainage pipe being less than said elevation of said sump perimeter wall, less than said elevation of said trap inside wall and greater than said elevation of said annular space bottom, whereby water accumulating in said annular space interior volume will drain through said annular space drainage pipe and will not overtop said sump perimeter wall. 17. The method of claim 16 wherein said drainage pipe is perforated and is located within said drainage medium. 18. The method of claim 16 wherein said drainage pipe is unperforated and drains to an oil-water separator, whereby said annular space interior volume defines a secondary containment for a spill of said liquid within said tank sump. 19. The underground storage tank system apparatus of claim 1 wherein said annular sediment trap is generally rectangular in horizontal cross section, said trap interior volume and said annular space interior volume being annularly located within said manway.
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