초록 ▼

A triple-walled underground storage tank is provided with primary, secondary and tertiary walls. Between each two adjacent walls, an annular space is provided. The annular space is continuous throughout, and permits the flow of liquid therein. Monitors may be provided separately for each annulus, to

A triple-walled underground storage tank is provided with primary, secondary and tertiary walls. Between each two adjacent walls, an annular space is provided. The annular space is continuous throughout, and permits the flow of liquid therein. Monitors may be provided separately for each annulus, to detect the formation of leaks, or a lack of containment, in either wall defining the annular space. In one embodiment, the tertiary wall is a smooth cylinder formed about the circumferential ribs of the secondary wall. In the alternative embodiment, the rib-bearing wall is the tertiary wall, and the walls and annular materials of the tank are formed within a female mold. In either case, a tank prepared from integral ribs, with superior robustness and strength, is provided with triple containment.

대표청구항 ▼

1. A triple-walled underground storage tank (UST) comprising: (a) a generally cylindrical primary wall adapted for the containment of liquid materials, terminating in two dome-shaped ends; (b) a secondary wall encircling substantially the entirety of said primary wall and providing secondary con

1. A triple-walled underground storage tank (UST) comprising: (a) a generally cylindrical primary wall adapted for the containment of liquid materials, terminating in two dome-shaped ends; (b) a secondary wall encircling substantially the entirety of said primary wall and providing secondary containment for said liquid material, wherein a first annulus is provided between substantially the entirety of said primary and secondary wall through which liquid may flow; and (c) a tertiary wall encircling substantially the entirety of said secondary wall and providing tertiary containment for said liquid materials, wherein a second annulus is provided between substantially the entirety of said tertiary and secondary walls through which liquid may flow; (d) wherein said first annulus and said second annulus are not in fluid communication with each other and a space interior to the primary wall wherein said liquid materials are contained; and (e) wherein the relationship between the primary wall and the secondary wall is such that fluid flow is permitted through substantially the entire first annulus, and the relationship between the secondary wall and the tertiary wall is such that fluid flow is permitted through substantially the entire second annulus and wherein at least one of said first annulus and said second annulus is substantially filled with monitoring liquid. 2. The UST of claim 1, wherein said primary, secondary and tertiary walls are comprised principally of fiber reinforced plastic (FRP). 3. The UST of claim 1, wherein said first annulus and said second annulus are provided with separate monitors for determining the formation of leaks in said walls. 4. The UST of claim 3, wherein said monitors comprise reservoirs formed of FRP and adhered to said tertiary and secondary walls. 5. The UST of claim 1, wherein said tank is built wholly within a female mold, and said tertiary wall is comprised of ribs formed integrally with said tertiary wall. 6. The UST of claim 1, wherein said first and second annulus are comprised of materials adhered to said walls on either side of said annulus, and through which fluid may flow. 7. The UST of claim 6, wherein said annular material of at least one of said first and second annulus is comprised of a three-dimensional fiberglass fabric impregnated with resin. 8. The UST of claim 7, wherein both said first and second annular materials are comprised of three-dimensional fabric comprised of fiberglass impregnated with resin.