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Vaulted underground storage tank
| Details |
Inventors: Elliott, Jr., Thomas P.;
Assignee: Dalworth Concrete Products, Inc. (Katy, TX)
Primary Examiner: Friedman; Carl D.
Assistant Examiner: Canfield; Robert J.
Attorney, Agent or Firm: Knobbe, Martens, Olson & Bear
An underground storage system for hazardous liquids having an inner fluid storage tank surrounded by a larger outer containment vault with sufficient space between to allow for visual inspection of the tank. The inner tank has a rectangular parallelepiped shape and is positioned within an outer rectangular parallelepiped vault in a manner leaving a larger clearance space between two adjacent tank sides and facing vault walls than between the opposite adjacent two sides and walls. Additionally, a vertical clearance exists between the tank and vault. The vault is reinforced concrete precast in sections for ease of transport and assembly on-site. The vault has a bottom pan-shaped unit with one or more square tubular collar units on top and terminates in an upper cover. The cover includes one or more man-way apertures enabling a technician to enter the vault and inspect the tank for leaks. The increased use of excavated space for fluid storage reduces costs associated with transport and installation. |
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DETAILED DESCRIPTION The present invention provides an improved underground vaulted storage tank for hazardous liquids.
A rectangular parallelepiped shaped internal hazardous liquid storage tank is installed within an external rectangular parallelepiped concrete vault with a sufficient amount of space left on two of the four sides for visual inspection of the internal tank and a sufficient amount of space left on the other two sides for physical access to the internal tank.
The internal tank may be constructed of steel or other materials and, desirably, has openings as required for piping connections to fill, vent, or pump from the tank.
The external vault provides a structure which serves as a means to hold back the soil, keep the internal tank free from contact with water and corrosive elements, and provide an accessible space to readily inspect and/or repair the internal tank.
Advantageously, land area used to install the vault for the underground storage tank is minimized because of the overall size of the vault compared with a vault used to store a comparably sized tank of the prior art.
In addition, the excavation size is reduced, therefore reducing digging costs.
Another benefit is the reduction in the volume of materials required to construct the vault due to the reduced overall size.
Finally, transportation costs are reduced due to the size reduction of the underground storage vault components.
In a preferred embodiment, the external vault is precast in four main sections.
A bottom section comprises a flat bottom with four upstanding walls around the periphery.
The bottom is approximately one- to two-thirds the total height of the vault and may have a square horizontal cross section or a cross section longer in one dimension than the other, preferably in a ratio of approximately 1.
25:1.
Preferably, the bottom is between 3 and 6 feet in height and, more preferably, has a height of 4'-9".
The horizontal cross section is between 10-22 feet long (advantageously 10-17 feet long) and between 8-14 feet wide and, desirably is 16'-4"
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