| 摘要 |
A triple-walled underground storage tank (100) is provided with primary (102), secondary (106), and tertiary walls (108). Between each two adjacent walls, an annular space (104, 114) is provided. The annular space (104, 114) 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 (108) is a smooth cylinder formed about the circumferential ribs (110) of the secondary wall (106). In the alternative embodiment, the rib-bearing wall is the tertiary wall, and the walls are formed within a female mold. In either case, a tank (100) is provided with triple containment.
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