Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1997-01-03
1998-07-07
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
138108, 141 86, 405 52, 405128, F16L 100, E02D 300
Patent
active
057758425
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.
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Catalog for Concrete Professionals.-4 sheets 7823 Lorsdale Rd., Springfield, VA 22150.
PISCES by OPW, Inc.
Taylor Dennis L.
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