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WO2010117613A1 - Réservoir de stockage souterrain avec piège à sédiments - Google Patents

Réservoir de stockage souterrain avec piège à sédiments Download PDF

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Publication number
WO2010117613A1
WO2010117613A1 PCT/US2010/028264 US2010028264W WO2010117613A1 WO 2010117613 A1 WO2010117613 A1 WO 2010117613A1 US 2010028264 W US2010028264 W US 2010028264W WO 2010117613 A1 WO2010117613 A1 WO 2010117613A1
Authority
WO
WIPO (PCT)
Prior art keywords
trap
annular space
water
interior volume
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2010/028264
Other languages
English (en)
Inventor
David E. Stein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/420,594 external-priority patent/US8156969B2/en
Application filed by Individual filed Critical Individual
Publication of WO2010117613A1 publication Critical patent/WO2010117613A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/10—Manholes; Inspection openings; Covers therefor
    • B65D90/105—Manholes; Inspection openings; Covers therefor for underground containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/76—Large containers for use underground
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use

Definitions

  • the invention is an apparatus for the capture of sediment in water entering a manhole for an underground storage tank.
  • the invention also is an apparatus providing secondary containment for spills of liquid from within a sump of an underground storage tank.
  • the problem addressed by the Invention is the flooding of electrical pumps and other subterranean systems serving underground storage tanks due to the blinding of underground water drainage systems by sediment and debris.
  • Underground storage tanks are tanks designed to contain liquids such as petroleum products and are buried below the surface of the ground.
  • a typical UST used in a gasoline filling station may contain 2,000 gallons or more of fuel.
  • the top of the tank is located thirty inches or more below a concrete driving surface.
  • the UST is surrounded by sand, gravel or crushed stone, which provides even support to the tank and acts as a drainage medium to allow water to drain away from the area of the tank.
  • the term 'drainage medium' includes crushed stone, sand, gravel and any equivalent material.
  • a manway communicates between the surface of the ground and a tank sump at the top of the UST.
  • the tank sump generally is cylindrical in shape and is attached to the top of the tank.
  • a typical tank sump is defined by an open-top, cylindrical perimeter wall that forms a water-tight and liquid-tight connection with the top of the UST.
  • the interior of the tank sump provides access to the tank for adding or removing liquid from the tank, to allow makeup air to enter the tank, or for other access to the interior of the tank.
  • the tank sump may include an electrically operated pump, associated piping and sensors. The pump and piping are configured to withdraw liquid from the bottom of the tank and to discharge the liquid through piping to liquid dispensers.
  • a single UST may incorporate more than one tank sump and be served by more than one manway.
  • the tank sump perimeter wall serves to contain liquid, such as a petroleum product, that may be spilled or that may leak from the systems serving the UST and that are located within the tank sump. Prevention of release of the liquid into the environment is important for environmental protection and for regulatory compliance. If the liquid escapes from the tank sump, as by overflowing the tank sump perimeter wall, the liquid is released into the environment, causing environmental damage and causing the owner of the UST to incur remediation costs.
  • liquid such as a petroleum product
  • a circular manhole skirt having a diameter greater than the tank sump defines a manhole, which is the entrance to the manway.
  • a manhole cover is supported by the manhole skirt and covers the manway.
  • the top of the manhole skirt and manhole cover generally are located at grade so that the manhole skirt and manhole cover do not present obstacles to travel; for example, so that the manhole skirt and cover do not prevent movement of vehicles on pavement located above the UST.
  • 'grade' means the elevation of the surface of the ground, concrete driving surface or other material below which the underground storage tank is buried.
  • the tank sump and lower portion of the manhole skirt are annularly arrayed, with the outer diameter of the tank sump perimeter wall being less than the inner diameter of the manhole skirt side wall.
  • the area between the manhole skirt side wall and the tank sump perimeter wall defines an annular space communicating between the manway and the drainage medium surrounding the UST.
  • water from surface runoff can and does enter the manhole past the manhole cover.
  • the source of the water may be rain, snow, or any other source of water.
  • the water enters the manway at the periphery of the manhole skirt and runs down the manhole skirt side wall.
  • the water encounters the crushed stone surrounding the tank when the water reaches the bottom of the manway.
  • the water drains through the drainage medium and away from the tank.
  • the invention is a sediment trap system used in conjunction with an underground storage tank.
  • a generally torroidal (donut-shaped) sediment trap has a trap inside wall, a trap outside wall and a trap bottom.
  • the sediment trap defines a water-tight trap interior volume.
  • the top of the sediment trap is open.
  • the trap inside wall is located within a manway serving the underground storage tank and between the tank sump perimeter wall and the manhole skirt side wall.
  • the trap inside wall and the tank sump perimeter wall are in spaced-apart relation, which may be annular.
  • a annular space is defined by the trap inside wall and the sump perimeter wall.
  • a drainage medium as defined above, is disposed within the annular space and is in fluid communication with the drainage medium surrounding the underground storage tank. The voids between the individual pieces of the drainage medium allow water to flow readily through the drainage medium and away from the underground storage tank.
  • the shape of the annular space defined by the spaced-apart relation between the sump perimeter wall and the trap inside wall depends upon the horizontal cross-sectional shapes of the tank sump and the sediment trap inside wall. Where the sump and trap inside wall are circular in horizontal cross section, the annular space will be a circular annular space. Where the sump perimeter wall and trap inside wall are rectangular in horizontal cross section, the annular space will be a rectangular angular space. As used in this application, the term 'annular' means 'ring shaped, ' regardless of whether the ring shape is circular, rectangular, or any other shape. In a first embodiment, the sediment trap and the manhole skirt side wall are formed separately.
  • the inside diameter of the outer wall of the sediment trap of 95 the first embodiment is greater than the outside diameter of the manhole skirt side wall, and the lower portion of the manhole skirt side wall is disposed within the trap interior volume.
  • the sediment trap and the manhole skirt side wall are unitary and the manhole skirt side wall defines the outer wall of the sediment trap.
  • An operator maintains the sediment trap and water drainage system by removing accumulated sediment from the bottom of the interior volume of the trap. Because the sediment and debris in the water entering the drainage medium 115 is substantially reduced, blinding of the drainage medium by sediment and debris is slowed and the life of the drainage medium is extended. Because the top of the trap interior volume is open and due to the shape of the sediment trap, the sediment may be readily removed by the operator, as by use of a familiar shop vacuum cleaner.
  • the useful life of the drainage medium may be extended further by providing one or more trap drainage pipes.
  • a first end of the trap drainage pipe is in fluid communication with the interior volume of the sediment trap at an elevation higher than the bottom of the sediment trap. Water entering the interior volume of the sediment trap slows and is stored temporarily in the
  • the trap drainage pipe may be perforated and may extend into the drainage 130 medium surrounding the tank.
  • the trap drainage pipe may be perforated and may extend into the drainage 130 medium surrounding the tank.
  • the water exits from the perforations in the trap drainage pipe and into the drainage medium.
  • the drainage medium along a portion of the perforated pipe become locally blinded by sediment, the water will flow to other perforations along the length of the trap drainage pipe.
  • the drainage medium along the 135 entire length of the trap drainage pipe become blinded, the water will accumulate in the sediment trap and will overflow the trap inside wall and flow into the annular space between the sediment trap inside wall and the tank sump perimeter wall, encountering the drainage medium in the annular space and draining away from the tank through the drainage medium.
  • perforated trap drainage pipes may be used to carry away the water from the sediment trap, provided the bottom of each pipe is above the elevation of the bottom of the sediment trap. While the trap or annular space drainage pipes may be perforated and drain to the drainage medium surrounding the UST as described above, those drainage pipes may be un-perforated and may
  • 145 convey water to any other suitable location, such as an oil-water separator, a sediment basin, a lateral field, a holding tank, or a water treatment plant.
  • the bottom of the annular space between the trap inside wall and the tank sump perimeter wall may be sealed. If the bottom of the annular space is sealed, the annular space interior volume is water and liquid-tight.
  • interior volume then defines a second sediment trap and also defines a secondary containment for liquid, such as a petroleum product, that may be released from the tank sump.
  • a leak or spill of a petroleum product within the tank sump may fill the tank sump and overtop the sump perimeter wall and the petroleum product then would flow into the secondary containment.
  • the second sediment trap and secondary containment may be drained by an 160 annular space drainage pipe in fluid communication with the annular space interior volume at an elevation above the bottom of the annular space. Sealing the bottom of the annular space and locating the annular space drainage pipe above the elevation of the bottom of the annular space allows the second sediment trap to store water and allows additional sediment to settle from the water. Locating the 165 annular space drainage pipe above the elevation of the sealed bottom of the annular space also allows the annular space interior volume to store petroleum or other liquid that escapes from the tank sump, providing the secondary containment for the tank sump.
  • the annular 170 space drainage pipe is not perforated and drains to an oil/water separator, which serves to collect both the water entering the annular space interior volume from the tank sump and the liquid water entering the annular space interior volume from the sediment trap.
  • Fig. 1 is a cross section of a prior art underground storage tank system.
  • Fig. 2 is a detail cross section of a first embodiment of the underground storage tank system of the Invention showing the relation between the sediment trap and the manhole skirt, tank sump and manhole cover.
  • Fig. 3. is a detail of Fig. 2 and is a cross section of a portion of the first 180 embodiment showing the relation between the sediment trap, manhole skirt, tank sump and drainage medium.
  • Fig. 4. is a detail cross section of a portion of a second embodiment showing the relation between the first and second sediment traps.
  • Fig. 5 is a detail cross section of a portion of a third embodiment showing a unitary 185 manhole skirt and sediment trap.
  • Fig. 6 is a detail cross section showing the relation between the sediment trap and a trap drainage pipe.
  • Fig. 7 is a detail cross section showing the relation between the second sediment trap and the annular space drainage pipe.
  • 190 Fig. 8 is a horizontal cross section through the sediment trap, annular space and tank sump of Fig. 5.
  • the Invention is an apparatus and method for preventing failure of an underground storage tank drainage system due to blinding of the drainage system 195 by sediment.
  • the Invention is also an apparatus and method for providing secondary containment for liquid released within a tank sump.
  • Fig. 1 illustrates a prior art underground storage tank system 2.
  • An underground storage tank 4 is buried beneath the surface 12 of the ground.
  • the underground storage tank 4 is surrounded in whole or in part by a drainage medium
  • a tank sump 8 is defined by sump perimeter wall 10, which is attached to a top side 6 of tank 4. Sump perimeter wall 10 forms a water and liquid-tight seal with top 6 of tank 4.
  • Tank sump 8 contains tank 4 systems for access to the interior of the tank 4, such as a pump, vents, fill tubes, or other tank 4 systems or
  • a manhole skirt 16 has a top side 18 that supports a manhole cover 26.
  • the manhole cover 26 covers the manhole opening 20 and manway 24.
  • a manhole skirt side wall 22 defines the manway 24 and prevents collapse of drainage medium 14 and earth into manway 24. Water entering the manway 24 past the manhole cover 26 enters the drainage medium 14 at the bottom of the manhole skirt side wall 22 and drains away from the underground storage tank 4.
  • the drainage medium 14 at the bottom of the manhole skirt side wall 22 can and does become blinded by sediment entrained in the water entering the manway 24 through the manhole 20.
  • Figs. 2 and 3 illustrate a first embodiment of the Invention.
  • Fig. 3 is a detail of Fig. 2.
  • sediment trap 28 is generally torroidal; that is, shaped like a donut.
  • the sediment trap 28 has a trap outside wall 30, a trap inside wall 32 and a trap bottom 34. Trap open top 36 is open, allowing water and sediment to enter the sediment trap 28.
  • the trap outside wall 30, trap inside wall 32 and trap bottom 34 are water-tight and define trap interior volume 38.
  • the sediment trap 28 and the manhole skirt side wall 22 are formed separately and the inside diameter of the outside wall 30 of the sediment trap 28 is greater than the outside diameter of the manhole skirt side wall 22.
  • the bottom portion 74 of the manhole skirt side wall 22 is disposed within the trap interior volume 38.
  • Water entering the manway 24 flows down the manhole skirt side wall 22 and enters the trap interior volume 38 through the trap open top 36 and is retained in the water-tight trap interior volume 38.
  • the velocity of the water slows and sediment 40 entrained in the water settles from the water and is deposited on the trap bottom 34.
  • Removing sediment 40 from the trap bottom 34 is an item of regular maintenance for the underground storage tank system 2. Removing sediment 40 from the trap bottom 34 may be readily accomplished through use of a familiar shop vacuum.
  • the sump perimeter wall 10, the sediment trap 28 and skirt side wall 22 are generally circular in horizontal cross section and are arrayed annularly.
  • the trap inside wall 32 and the sump perimeter wall 10 are in an annular spaced-apart
  • annular space 42 235 relation and define an annular space 42 between the trap inside wall 32 and the sump perimeter wall 10.
  • the annular space 42 has an annular space open top 44 and defines an annular space interior volume 46.
  • the annular space 42 features an opening 48 communicating between the annular space interior volume and the drainage
  • FIG. 4 illustrates a second embodiment of the Invention.
  • annular space interior volume 46 has a bottom side 72.
  • Bottom side 72 in combination with trap inside wall 32 and sump perimeter wall 10 are watertight and together define a second sediment trap 50.
  • Second sediment trap 50 250 lacks opening 48 and prevents water entering the annular space interior volume from entering drainage medium 14 through the bottom 72 of the annular space interior volume 46.
  • Fig. 5 illustrates an additional embodiment of the Invention.
  • the trap outside wall 30 may be defined by the manhole skirt side wall 22, so that the sediment trap 28 and the skirt side wall 22 are formed as a single unit.
  • the sediment trap of the embodiment of Fig. 5 in all other respects operates in the same manner as the sediment trap 28 illustrated by Figs. 2 and 3.
  • Fig. 6 illustrates an apparatus to further extending the life of the drainage 265 system of an underground storage tank 4.
  • a trap drainage pipe 52 penetrates the trap outside wall 30.
  • a first end 54 of the trap drainage pipe 52 intersects the trap interior volume 38.
  • the trap drainage pipe 52 has a bottom inside surface 56 at the first end 54.
  • the elevation of the bottom inside surface 56 of the trap drainage pipe 52 is greater than the elevation of the trap bottom 34 and is less 270 than the elevation of the top of the trap inside wall. The trap drainage pipe 52 therefore will not drain all of the water from the sediment trap 28.
  • the sediment trap 28 will receive water entering the manway 24 and sediment 40 will collect on the trap bottom 34. Water accumulating in the sediment trap interior volume 38 will rise until the 275 water encounters the bottom inside surface 56 of the trap drainage pipe 52. The water will enter the trap drainage pipe 52, which is sloped to drain the water away from the manway 24.
  • the trap drainage pipe 52 may direct the water to any suitable location, such as an oil-water separator, a lateral drainage field, a pond, a waste treatment
  • the trap drainage pipe 52 may include perforations along a portion of its length and be laid in the drainage medium 14, in which event the water will drain through the perforations and into the drainage medium and away from the tank 4. Should sediment entrained in the water blind the drainage medium proximal to a
  • the water will flow to other perforations. Should the drainage medium proximal to all of the perforations in the trap drainage pipe be blinded, then the water will not flow through the trap drainage pipe and will rise in the sediment trap until the water overtops the trap inside wall. The water then will enter the annular space interior volume and will discharge through the opening in
  • Fig. 7 illustrates an additional apparatus for extending the life of the underground storage tank drainage system and for preventing release into the environment of a liquid, such as a petroleum product, that my leak or otherwise be released from the tank sump 8.
  • Annular space bottom 72 is sealed so that the 295 annular space interior volume 46 is water and liquid-tight.
  • the water-tight annular space interior volume 46 defines a second sediment trap 50. Water and sediment that overtop trap interior wall 32 flow into the second sediment trap 50, slowing the water and allowing sediment 40 to settle out of the water and onto the bottom 72 of the second sediment trap 50.
  • annular space interior volume 46 also is liquid-tight and defines secondary containment 70 for the tank sump 8. If liquid, such as a petroleum product, is released or spilled within the tank sump 8 and overtops sump perimeter wall 10, the liquid will flow into the secondary containment 70 and be contained within the secondary containment 70.
  • An annular space drainage pipe 62 penetrates both the trap outside wall 30 and the trap inside wall 32.
  • the first end 64 of the annular space drainage pipe 62 communicates with the annular space interior volume 46.
  • the annular space drainage pipe 62 has a bottom inside surface 66 at the first end 64.
  • the bottom inside surface 66 of the annular space drainage pipe is located at an elevation
  • space drainage pipe 62 which is sloped to drain the water or liquid away from the manway 24.
  • the water is prevented from overtopping the sump perimeter wall 10 and entering the tank sump 8. Liquid is prevented from overtopping the trap inside wall 32.
  • the water and liquid from the annular space drainage pipe 62 preferably are discharged to an oil-water separator through a pipe 62 having no
  • the oil-water separator is known in the art and stores and separates the liquid and the water for proper disposal.
  • Fig. 8 is a horizontal cross section of the apparatus of Fig. 5 through the tank sump 8 and sediment trap 28 where the trap outer wall 30 and the skirt side wall 22 are unitary and formed as a single piece.
  • Figure 8 illustrates the annular 325 nature of the sediment trap 28 and the annular space 42 in a circular embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sewage (AREA)

Abstract

L'invention porte sur un appareil et sur un procédé de réservoir de stockage souterrain. Le réservoir de stockage souterrain enterré comporte une cuve de réservoir et un trou d'homme défini par une paroi latérale de jupe de trou d'homme faisant communiquer la surface du sol avec la cuve de réservoir. Un piège à sédiments est disposé de façon annulaire à l'intérieur du trou d'homme, et intercepte l'eau et les sédiments s'écoulant vers le bas de la paroi de la jupe de trou d'homme. Une paroi intérieure du piège à sédiment est en relation d'espacement mutuel annulaire avec une paroi périphérique de la cuve de réservoir, toutes deux définissant en association un volume intérieur d'espace annulaire recevant l'eau qui passe par-dessus la paroi intérieure de piège à sédiments, et recevant tout liquide passant par-dessus la paroi périphérique de la cuve de réservoir.
PCT/US2010/028264 2009-04-08 2010-03-23 Réservoir de stockage souterrain avec piège à sédiments Ceased WO2010117613A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/420,594 US8156969B2 (en) 2008-11-06 2009-04-08 Underground storage tank with sediment trap
US12/420,594 2009-04-08

Publications (1)

Publication Number Publication Date
WO2010117613A1 true WO2010117613A1 (fr) 2010-10-14

Family

ID=42130170

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2010/028264 Ceased WO2010117613A1 (fr) 2009-04-08 2010-03-23 Réservoir de stockage souterrain avec piège à sédiments

Country Status (1)

Country Link
WO (1) WO2010117613A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491147A (en) * 1982-09-01 1985-01-01 Toby Argandona Fillbox for storage tank inlet
US4655361A (en) * 1986-01-03 1987-04-07 Clover Norvin Q Containment tank
US5244307A (en) * 1990-08-13 1993-09-14 Wokas Albert L Anti-pollution piping and dispensing system
US20020090267A1 (en) * 2001-01-08 2002-07-11 Wimberger Brian J. Erosion control drain
US20050077248A1 (en) * 2003-10-13 2005-04-14 Royal Environmental Systems, Inc. Stormwater treatment system for eliminating solid debris
US20050184007A1 (en) * 2004-02-20 2005-08-25 Allard Douglas P. Storm water treatment apparatus employing dual vortex separators
US20080099490A1 (en) * 2006-10-31 2008-05-01 John Burwell Flat-sided single-wall attached sump collar

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491147A (en) * 1982-09-01 1985-01-01 Toby Argandona Fillbox for storage tank inlet
US4655361A (en) * 1986-01-03 1987-04-07 Clover Norvin Q Containment tank
US5244307A (en) * 1990-08-13 1993-09-14 Wokas Albert L Anti-pollution piping and dispensing system
US20020090267A1 (en) * 2001-01-08 2002-07-11 Wimberger Brian J. Erosion control drain
US20050077248A1 (en) * 2003-10-13 2005-04-14 Royal Environmental Systems, Inc. Stormwater treatment system for eliminating solid debris
US20050184007A1 (en) * 2004-02-20 2005-08-25 Allard Douglas P. Storm water treatment apparatus employing dual vortex separators
US20080099490A1 (en) * 2006-10-31 2008-05-01 John Burwell Flat-sided single-wall attached sump collar

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