A liquid storage tank includes a vessel comprising sidewalls, end walls, a floor and a roof that define a closed interior cavity within the vessel, with at least a first of the sidewalls of the vessel having a multi-walled construction comprising an interior wall and an interior wall. The tank furth
A liquid storage tank includes a vessel comprising sidewalls, end walls, a floor and a roof that define a closed interior cavity within the vessel, with at least a first of the sidewalls of the vessel having a multi-walled construction comprising an interior wall and an interior wall. The tank further comprises a manway assembly in the first sidewall. The manway assembly comprises exterior and interior openings and exterior and interior doors for closing the exterior and interior openings, respectively. The exterior and interior openings and the exterior and interior doors are arranged relative to each other and the interior door is sufficiently small so that while the exterior door is open the interior door can be opened by pivoting the interior door into the exterior opening.
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1. A liquid storage tank comprising: a vessel comprising sidewalls, end walls, a floor and a roof that define a closed interior cavity within the vessel, at least a first of the sidewalls of the vessel having a multi-walled construction comprising an interior vessel wall and an exterior vessel wall,
1. A liquid storage tank comprising: a vessel comprising sidewalls, end walls, a floor and a roof that define a closed interior cavity within the vessel, at least a first of the sidewalls of the vessel having a multi-walled construction comprising an interior vessel wall and an exterior vessel wall, the interior vessel wall defining a portion of the closed interior cavity of the tank; anda manway assembly in the first sidewall, the manway assembly comprising exterior and interior manway walls coupled to the interior and exterior vessel walls, respectively, an interstitial manway cavity between the exterior and interior manway walls, exterior and interior manway openings in the exterior and interior manway walls, respectively, and exterior and interior doors for closing the exterior and interior manway openings, respectively, to provide fluid-tight seals between, respectively, the interstitial manway cavity and an exterior of the vessel and between the interior cavity and the interstitial manway cavity, the interior manway opening being disposed in the first sidewall such that the interior door prevents a liquid within the interior cavity from leaking into the interstitial manway cavity through the interior manway opening, the exterior manway opening being disposed in the first sidewall such that the exterior door prevents a liquid within the interstitial manway cavity from leaking to the exterior of the vessel through the exterior manway opening, the manway assembly further comprising means for draining a liquid from the interstitial manway cavity to a second interstitial cavity within the floor of the vessel. 2. The liquid storage tank according to claim 1, further comprising a manway housing assembly containing the manway assembly. 3. The liquid storage tank according to claim 2, wherein the manway housing assembly comprises: an exterior wall assembly comprising the exterior manway wall in which the exterior manway opening is defined and to which the exterior door is mounted; andan interior wall assembly comprising the interior manway wall in which the interior manway opening is defined and to which the interior door is mounted. 4. The liquid storage tank according to claim 3, wherein the exterior wall assembly comprises a first insert that is mounted in the exterior manway wall and defines the exterior manway opening. 5. The liquid storage tank according to claim 4, wherein the interior wall assembly comprises a second insert that is mounted in the interior manway wall and defines the interior manway opening, and the interior manway wall of the interior wall assembly is spaced apart from the exterior manway wall of the exterior wall assembly. 6. The liquid storage tank according to claim 5, wherein the interstitial manway cavity is within the manway housing assembly. 7. The liquid storage tank according to claim 6, further comprising means outside the interstitial manway cavity for visually detecting the presence of a liquid within the interstitial manway cavity. 8. The liquid storage tank according to claim 1, wherein the draining means comprises at least one opening in the interior manway wall. 9. The liquid storage tank according to claim 8, wherein the at least one opening comprises slots formed at a lowermost extent of the interior manway wall. 10. The liquid storage tank according to claim 2, wherein the manway housing assembly defines a recess in the first sidewall. 11. The liquid storage tank according to claim 10, wherein the interior wall assembly comprises a third wall that defines a ceiling of the recess. 12. The liquid storage tank according to claim 1, wherein the exterior and interior manway openings are co-axially aligned and the exterior and interior doors are arranged relative to each other and the interior door is sufficiently small so that while the exterior door is open the interior door can be opened by pivoting the interior door into the exterior manway opening. 13. The liquid storage tank according to claim 1, wherein the first sidewall of the vessel has a double-walled construction formed by the interior and exterior vessel walls. 14. The liquid storage tank according to claim 1, wherein the interior and exterior vessel walls define a second interstitial cavity therebetween adapted to receive and contain a liquid that leaks through the interior vessel wall. 15. The liquid storage tank according to claim 14, further comprising means for draining the second interstitial cavity. 16. The liquid storage tank according to claim 1, further comprising means for transporting the liquid storage tank. 17. The liquid storage tank according to claim 16, wherein the transporting means comprises wheels and a hitch. 18. The liquid storage tank according to claim 1, further comprising a manway located in the roof of the liquid storage tank. 19. The liquid storage tank according to claim 1, wherein the closed interior cavity of the vessel has a capacity of at least 10,000 gallons.
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이 특허에 인용된 특허 (3)
Webb R. Michael, Above-ground fuel storage system.
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