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 piping system for conveying fluid from the outlet port of an underground pump to the inlet port of an above-ground fluid dispenser which comprises: (a) a containment chamber installed below grade level containing the pump, said chamber comprising a body capable of containing leaked fluid, a remova

A piping system for conveying fluid from the outlet port of an underground pump to the inlet port of an above-ground fluid dispenser which comprises: (a) a containment chamber installed below grade level containing the pump, said chamber comprising a body capable of containing leaked fluid, a removable cover at about grade level, and a sleeve in communication with the body extending outwardly therefrom, (b) a primary pipe of flexible material for conveying the fluid from the pump, the primary pipe having an inlet end and an outlet end, (c) means for removably securing the inlet end of the primary pipe in sealed communication with the outlet port of the pump, (d) means for removably securing the outlet end of the primary pipe in sealed communication with the inlet port of the fluid dispenser, (e) a secondary pipe of flexible material generally surrounding the primary pipe, said secondary pipe having a lower end and an upper end, the lower end of the secondary pipe being in sealed communication with the containment chamber sleeve, said inner surface of the secondary pipe and said outer surface of the primary pipe defining an annular space, (f) a dispenser pan installed below the fluid dispenser and the fluid dispenser inlet port so as to contain leakage therefrom, said dispenser pan comprising a body and a pan sleeve in communication with the pan in a gravity draining relationship therefrom, the upper end of the secondary pipe being in sealed communication with the pan sleeve, and (g) a repeater chamber installed below grade level and comprising a body capable of containing leaked fluid, a removable cover at about grade level and a pair of sleeves in communication with the body extending outwardly therefrom, the primary pipe passing through said repeater chamber sleeves and the secondary pipe comprising a plurality of secondary pipe segments, wherein respective ends of secondary pipe segments are in sealed communication with each of said repeater chamber sleeves, the dispenser pan sleeve, and the containment chamber sleeve, wherein the primary pipe comprises a plurality of primary pipe segments, and a coupling joining in sealed communication each contiguous pair of said primary pipe segments, each of said couplings being generally surrounded by a repeater chamber as recited above in paragraph (g), whereby fluid leaked into the dispenser pan or the annular space between the primary pipe and the secondary pipe may travel within the annular space and is contained within the system, and whereby the primary pipe may be replaced by removing the cover from the containment chamber and uncovering the dispenser pan, unsecuring each end of said primary pipe, and pulling said primary pipe out through said sleeves.