초록 ▼

A coaxial piping system connected between an underground pump and an above-ground liquid dispenser is used to provide containment of the pumped liquid from the underground piping system, preventing unintended release into the environment. A pair of coaxial pipes are removably connected to the underg

A coaxial piping system connected between an underground pump and an above-ground liquid dispenser is used to provide containment of the pumped liquid from the underground piping system, preventing unintended release into the environment. A pair of coaxial pipes are removably connected to the underground pump at one end and to the dispenser at the other end using quick-disconnect fittings to allow for the replacement of the piping. A primary pipe for conveying gasoline or the like is surrounded by a secondary pipe, which provides containment in the event of leakage from the primary pipe. The piping system can be tested for leaks or replaced from grade without excavating at the installed tank site. A sensor in the annular space between the primary and secondary pipes may be used to detect leakage. A path may be provided for the gravity drainage of such leaks from the secondary pipe into a containment chamber, where the liquid may be detected and removed.

대표청구항 ▼

A secondarily contained piping system comprising: (a) a flexible inner supply pipe; (b) an outer secondary containment pipe; (c) a first underground access chamber; (d) a second underground access chamber spaced from the first underground access chamber; (e) said flexible inner supply pipe positione

A secondarily contained piping system comprising: (a) a flexible inner supply pipe; (b) an outer secondary containment pipe; (c) a first underground access chamber; (d) a second underground access chamber spaced from the first underground access chamber; (e) said flexible inner supply pipe positioned to provide a path of fluid communication between said first underground access chamber and said second underground access chamber; (f) said flexible inner supply pipe having an exterior surface; (g) said flexible inner supply pipe further having a first end and a second end; (h) said secondary containment pipe surrounding at least a portion of the exterior surface of said inner supply pipe; (i) a fluid source connected at the first end of the flexible inner supply pipe; (j) a fluid outlet connected at the second end of the flexible inner supply pipe; (k) a first coupling connecting the flexible inner supply pipe to the fluid source, the first coupling being disposed within the first underground access chamber; and (l) a second coupling connecting the flexible inner supply pipe to the fluid outlet, the second coupling being disposed within the second underground access chamber.