Under-dispenser containment system
a technology of containment system and under-dispenser, which is applied in the directions of transportation and packaging, packaging, liquid transfer devices, etc., can solve the problems of not all plumbing connections can be contained within this shallow container, make the installation of a multitude of primary and secondary piping plumbing connections and riser assemblies difficult, time-consuming,
Active Publication Date: 2006-08-03
ENVIRON OPW INC
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AI Technical Summary
Benefits of technology
The shallow design facilitates easier inspection and repair, reduces the number of piping joints, and provides enhanced resistance to ground pressures, minimizing leak risks and environmental hazards while simplifying installation and reducing fabrication needs.
Problems solved by technology
Dispenser sumps on the other hand are deep containers with a narrow top opening that makes access difficult for installing a multitude of primary and secondary piping plumbing connections and riser assemblies.
The limited access into such deep containers (30″ to 48″ deep) makes installation and future repair very difficult and time consuming.
The problems associated with these dispenser pans was that not all plumbing connections could be contained within this shallow container.
This primary drawback led to the virtual extinction of shallow dispenser pans by the middle of the 1990's.
There are a number of other problems associated with deep, flat, vertical sided containers like that of today's dispenser sumps, besides limited accessibility.
The combination of a deep container having large flat side walls can have problem with concaving (bowing inward or outward), collapse, or cracking due to ground pressures caused by high ground water conditions and / or being installed in fluid backfill materials like sand.
It is the significant depth of these conventional deep dispenser sumps that causes so many problems.
The concaving of the large flat sidewalls can damage pipe entry seals, cause cracks in the sump container wall or even cause damage to the fuel delivery piping contained within.
To repair any damage to these sumps is very difficult and time consuming because of the limited access.
These deep dispenser sumps can also contain a large volume of leaking fuel before the leaks are detected that could cause a significant safety and environmental risk.
Method used
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[0030] Referring to FIG. 1, a type of underground fuel storage and dispensing system that includes an underground storage tank 10 equipped with an originating chamber 12 that contains a dispensing pump 11. The dispensing pump 11 is connected by an originating plumbing assembly 13 that provides a means of product shut-off and transition. The originating plumbing assembly 13 is connected to one or more above ground dispensing units 60 by an underground pipeline 20, that has a multitude of piping segments 20a, 20b and 20c. The piping segments 20a, 20b and 20c are connected together by pipefittings 26, mostly installed outside containment sumps, in a branch routing method. This method of pipe routing is typical with rigid piping systems that terminate under each above-ground dispensing unit 60.
[0031] Also illustrated is another type of pipeline, called vapor recovery piping 22, that is used to transfer hydrocarbon vapors from the above ground dispensing units 60 to the vapor recovery f...
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A type of under-dispenser containment system that is easier to install, inspect and repair primary and secondary piping connections located underneath an above ground dispensing unit. This shallow type containment chamber has angled sidewalls that permit underground pipeline connections to be made directly to specially designed shear valves without the need for a riser pipe assembly.
Description
FIELD OF THE INVENTION [0001] The present invention relates to under-dispenser containment system for in environmentally safe underground piping systems typically installed at service stations. More particularly, the invention relates to a “dispenser sump” that secondarily contains pipe couplings and valves. BACKGROUND OF THE INVENTION [0002] In response to increasing environmental regulations of underground storage and pipe delivery systems of hazardous liquids such as, motor fuels environmental regulators have been seeking safer and more reliable tank, piping and sump containment systems. In 1988 the US Congress passed the “Clean Water Act” that contained legislation that mandated that fuel handling facilities, like service stations insure that the fuel that was stored in underground storage tanks (UST's) and supplied via underground piping to the fuel dispensers could not leak into the environment. [0003] As a result of this federal legislation and other state laws governing the ...
Claims
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IPC IPC(8): B67D5/60B67D7/78
CPCB65G5/00B67D7/3209B67D7/3218
InventorWEBB, MICHAEL C.
OwnerENVIRON OPW INC