Double-containment underground piping system

Details Double-containment underground piping system Double-containment underground piping system

1995-06-06

1997-01-07

Taylor, Dennis L.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

405 52, 405128, 588259, 138114, 138111, F16L 100

Patent

active

055909817

ABSTRACT:
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.

REFERENCES:
patent: 3974862 (1976-08-01), Fuhrmann
patent: 4932257 (1990-06-01), Webb

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