# US 5,567,083 A · Double-containment underground piping system

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- Number: US 5,567,083 A
- Document ID: US5567083A
- Status: Granted
- Kind: A
- Application number: 08/469,651
- Filed: 1995-06-06
- Granted: 1996-10-22
- Earliest claimed: 1988-12-20
- Assignees: Intelpro Corporation
- Inventors: Keith J. Osborne
- Web page: https://patentgrep.com/patent/US5567083A

## CPC

- F16L 39/02: for hoses
- B67D 7/04: for transferring fuels, lubricants or mixed fuels and lubricants
- B67D 7/3209: {relating to spillage or leakage, e.g. spill containments, leak detection (leak detectors for underground fuel dispensing systems G01M3/2892)}
- F16L 39/005: {for concentric pipes}
- G01M 3/04: by detecting the presence of fluid at the leakage point
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- B67D: DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR (cleaning pipes or tubes or systems of pipes or tubes B08B9/02; emptying or filling of bottles, jars, cans, casks, barrels, or similar containers, not otherwise provided for B67C; water supply E03; pipe systems F17D; domestic hot-water supply systems F24D; measuring volume, volume flow, mass flow or liquid level, metering by volume G01F; coin-freed or like apparatus G07F)
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

A double piping system connected between an underground storage tank and the above ground liquid dispenser is used to provide containment of the pumped liquids from the underground piping system into the environment. The piping system can be tested or replaced from grade without excavating or breaking ground at the installed tank site. Also, disclosed is a method for detecting such leaks and for the gravity drainage of such leaks into a containment chamber.

## Claims

### Claim 1

A secondarily contained piping system comprising:
(a) a flexible inner supply pipe;
(b) an outer secondary containment pipe;
(c) two spaced access chambers designed for underground use which are interconnected in a fluid tight manner through the side wall of one chamber just above the chamber base by the secondary containment pipe;
(d) all flexible inner supply pipe couplings and associated fittings being disposed within the access chambers;
(e) a fluid source fitting at one end providing an originating interface to the flexible inner supply pipe;
(f) a fluid outlet at the other end providing a terminating interface to the flexible inner supply pipe;
(g) one access chamber being of sufficient size to permit manual or mechanical removal or replacement of the flexible inner supply pipe; and
(h) the flexible inner supply pipe having sufficient bend radius to be removed and replaced through the access chamber.

### Claim 2

The system of claim wherein said access chambers are underground access chambers.