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US 4,932,257 AGranted
Double wall piping system
OwnerMichael C. Webbinventor
Life of this patent
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OwnerMichael C. Webbinventor
Estimating the term…
A double wall pipeline is provided for a pumping system for fluid products, such as gasoline, diesel fuel and chemicals, and including a pump for pumping such products from a storage tank through the pipeline to a product dispenser. The double wall pipeline comprises a double wall, an inner primary pipe, an outer secondary pipe spaced from and surrounding the primary pipe, and integral spokes or spacers for supporting the secondary pipe in spaced relation to the primary pipe so as to create an annular space therebetween. The ends of some of the secondary pipe sections are stripped or cut back so as to terminate short of the corresponding end of the primary pipe and thereby permit testing and inspection of the primary pipe prior to completion of a secondary piping system in which the secondary pipe is incorporated. Unique primary and secondary fittings are provided as well as an air test clamp assembly for testing the integrity of the primary pipe and a collection sump fitting incorprated in the pipeline to permit the location of a leak to be visually determined.
In a pumping system for fluid products, such as gasoline, diesel fuel and chemicals, and including a pump for pumping such products from a storage tank through a pipeline connection to a product dispenser, the improvement wherein said pipeline connection comprises a double wall piping system comprising an inner primary pipe, an outer secondary pipe spaced from and surrounding said primary pipe, means for supporting the secondary pipe in spaced relation to the primary pipe so as to create an annular space therebetween, and an air test clamp assembly clamped to said double wall piping system for enabling air pressure testing of a secondary piping system incorporating said secondary pipe, said air test clamp assembly being disposed at a location at which the primary pipe extends beyond the secondary pipe and said air test clamp assembly comprising a fitting member, clamping means for releasably clamping one end of the fitting member to the exterior of the primary pipe and for clamping the other end of the fitting member externally of the secondary pipe, and valve means in said fitting member for permitting connection of the fitting member to a source of air under pressure so that air under pressure can be supplied to the secondary piping system, said air test clamp assembly being affixed to a wall of a unit of the pumping system, said wall having a hole therein through which a portion of said pipeline system extends, and said test clamp assembly further comprising a coupling member including a flange affixed to said wall and a base portion extending through said wall, and said clamping means comprising a coupling member including a flange affixed to said wall and a base portion extending through said wall, and said clamping means comprising a first clamp for clamping said one end of said fitting member to the exterior of said primary pipe and a second clamp for clamping said other end of said fitting to the exterior of the base portion of said coupling member.
In a pumping system for fluid products, such as gasoline, diesel fuel and chemicals, and including a pump for pumping such products from a storage tank through a pipeline connection to a product dispenser, the improvement wherein said pipeline connection comprises a double wall piping system comprising an inner primary pipe, an outer secondary pipe spaced from and surrounding said primary pipe, means for supporting the secondary pipe in spaced relation to the primary pipe so as to create an annular space therebetween, and at least one secondary fitting for connecting adjacent portions of the secondary pipe of the pipeline system, said secondary fitting comprising a split fitting member having a single split therein extending the length in the top surface thereof so as to permit the ends of the fitting which define the split to be forced apart and thus permit a portion of the primary pipe to be received therein, the ends of the secondary fitting which define said split being shaped to define a V-groove therebetween, and a fusion rod weld located in said V-groove joining said ends of said secondary fitting together.
An underground piping system comprising primary and secondary pipes, and air test means for enabling air pressure testing of the secondary pipe, said air test means comprising an air test clamp assembly disposed at a location where the primary pipe extends beyond the secondary pipe and comprising a fitting member, clamping means for releasably clamping one end of the fitting member externally of the secondary pipe, and valve means for permitting connection of the fitting member to a source of air under pressure so that air under pressure can be supplied to a secondary piping system incorporating said second pipe, said air test clamp assembly being affixed to a wall of a unit in the piping system, said wall having a hole therein through which a portion of said pipeline system extends and said test clamp assembly further comprising a coupling member including a flange affixed to said wall and a base portion extending through the hole in said wall, said clamping means comprising a first clamp for clamping said one end of said fitting member to the exterior of said primary pipe and a second clamp for clamping said other end of said fitting to the exterior of the base portion of said coupling member.
Dependencies are inferred from the claim text.