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US 5,297,896 AGranted
Environmentally safe underground piping system
AssigneeEnviron Products, Inc.
InventorMichael C. Webb
Life of this patent
Estimating the term…
Abstract
An environmentally safe underground piping system for liquid fuels and chemicals which interconnects an underground liquid storage tank to one or more above ground liquid dispensing units, that provides a complete secondary containment system for the entire primary liquid supply piping system. The piping systems employs one tank access chamber interconnected to one or more dispenser access chambers by a double walled pipe. The double wall pipe provides an interstitial space for gravity flow of any leaking liquids, from any point in the primary liquid supply piping system, to an access chamber, which also serves as a liquid collection sump, for purposes of leak detection.
Claims32
A secondarily contained underground piping system which connects the dispensing pump of an underground storage tank to an above ground dispensing unit, comprising:
- a) a originating chamber installed around the dispensing pump located at the beginning of a piping line providing a means of surface access, secondary containment, leak collection and having at least one opening in one of its side walls for pipeline access;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a piping line, providing a means of surface access, secondary containment, leak collection and having at least one opening in one of its side walls for pipeline access;
- c) a non-flexible containment piping section which is non-continuous comprising two or more straight non-flexible pipe lengths joined together by couplings, having an inside diameter of sufficient size, and a directional bend radius of sufficient length to permit a flexible supply section to be inserted from one end to the other, said sections interconnecting one chamber to the next through the openings in the side wall of the chambers;
- d) a sealing device providing a means of sealing all pipe entry and exit openings in the side wall of the chambers, to the annular wall of the non-flexible containment pipe, whereby the joint is liquid tight and secure;
- e) an originating plumbing assembly, providing a means of fluid shut-off and pump and flexible supply pipe interface, which is connected to the dispensing pump contained in the originating chamber;
- f) a terminating plumbing assembly, providing an interface for the dispensing unit and a flexible supply pipe section, connected to the above ground dispensing unit by means of a safety valve in the terminating chamber;
- and
- g) a flexible supply pipe section having couplings installed on each end as a means of interconnecting one plumbing assembly to the next through a non-flexible containment pipe section.
5 more elements
A secondarily contained underground piping system which interconnects the dispensing pump of an underground storage to an above ground dispensing unit comprising:
- a) a originating chamber which is installed around the tank dispensing pump located at the beginning of a piping line, providing a means of surface access, secondary containment and leak collection;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a piping line providing a means of surface access, secondary containment and leak collection;
- c) a flexible double walled piping section consisting of an outer flexible secondary containment pipe integral with an inner flexible primary supply pipe which is fitted on each end with a coupling;
- d) a sealing device providing a means of mechanically sealing all pipe entry and exit openings in the side wall of the chambers, to the annular wall of the non-flexible containment pipe, whereby the joint is liquid tight and secure;
- e) an originating plumbing assembly providing a means of fluid shut-off and pump and flexible supply pipe interface, which is connected to the dispensing pump in the originating chamber;
- and
- f) a terminating plumbing assembly providing an interface for the dispensing unit and a flexible supply pipe section connected to the above ground dispensing unit indirectly by means of a safety valve, contained within the terminating chamber.
4 more elements
A secondarily contained underground piping system which interconnects the dispensing pump of an underground storage to an above ground dispensing unit comprising:
- a) a originating chamber which is installed around the tank dispensing pump located at the beginning of a piping line, providing a means of surface access, secondary containment and leak collection;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a piping line providing a means of surface access, secondary containment and leak collection;
- c) a flexible piping section consisting of an outer flexible secondary containment pipe integral with an inner flexible primary supply pipe which is fitted on each end with a coupling;
- d) a sealing device providing a means of mechanically sealing all pipe entry and exit openings in the side wall of the chambers, to the annular wall of the non-flexible containment pipe, whereby the joint is liquid tight and secure;
- e) an originating plumbing assembly providing an interface connecting to the dispensing pump in the originating chamber;
- and
- f) a terminating plumbing assembly providing an interface for the tank dispensing pump and flexible primary supply pipe section.
4 more elements
A secondarily contained underground piping system which interconnects the dispensing pump of an underground storage to an above ground dispensing unit comprising:
- a) a originating chamber which is installed around the tank dispensing pump located at the beginning of a piping line, providing a means of surface access, secondary containment and leak collection;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a piping line providing a means of surface access, secondary containment and leak collection;
- c) a flexible piping section consisting of an outer flexible secondary containment pipe integral with an inner flexible primary supply pipe which is fitted on each end with a coupling;
- d) a sealing device providing a means of mechanically sealing all pipe entry and exit openings in the side wall of the chambers, to the annular wall of the non-flexible containment pipe, whereby the joint is liquid tight and secure.
1 more element
A non-secondarily contained underground piping system which interconnects the dispensing pump of an underground storage tank to an above ground terminating dispensing unit, comprising:
- a) a originating chamber installed around the dispensing pump located at the beginning of a piping line, providing a means of surface access, secondary containment, leak collection and having openings in the side wall for piping;
- b) a terminating chamber installed directly under an above ground dispensing unit located at the end of a piping line providing a means of surface access, secondary containment, leak collection and having an opening in the side walls for pipe entry;
- c) a flexible supply pipe section which is not secondarily contained and is continuous having a coupling installed on each end;
- d) a sealing device providing a means of mechanically sealing all pipe entry and exit openings located in the side wall of the chambers, to the annular wall of the non-flexible containment pipe, whereby the joint is liquid tight and secure;
- e) a originating plumbing assembly providing a means of fluid shut-off and pump and flexible supply pipe interface connected to the dispensing pump;
- and
- f) a terminating plumbing assembly providing an interface for the dispensing unit and a flexible supply pipe section, connected to the above ground dispensing unit indirectly by means of a safety valve, contained within the terminating chamber.
4 more elements
A secondarily contained underground piping system as claimed in claimed 20, including:
- g) a junction chamber which is installed under an above ground dispensing unit located within the piping line providing a means of surface access, secondary containment, leak collection and having openings in the side walls for pipe entry and pipe exit;
- and
- h) a junction plumbing assembly, which provides an interface for the dispensing unit and two flexible pipe sections, connected to the above ground dispensing unit.
A secondarily contained underground piping system which connects the dispensing pump of an underground storage tank to an above ground dispensing unit, comprising:
- a) an originating chamber installed around the dispensing pump located at the beginning of a pipe line providing a means of surface access, secondary containment and leak collection;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a pipe line providing a means of surface access, secondary containment and leak collection;
- c) an outer containment piping section and flexible supply piping section interconnecting one chamber to the next through openings in the side wall of the chambers;
- d) a sealing device, mechanically sealing pipe entry and exit openings located in the side wall of the chambers, to the containment pipe, whereby the joint is liquid tight and secure;
- e) an originating plumbing assembly providing a means of fluid shut-off and pump and flexible supply pipe interface, connected to the dispensing pump contained within the originating chamber;
- and
- f) a terminating plumbing assembly providing an interface for the dispensing unit and flexible supply piping section connected to the above ground dispensing unit by means of a safety valve in the terminating chamber.
4 more elements
A secondarily contained underground piping system which connects the dispensing pump of an underground storage tank to an above ground dispensing unit, comprising:
- a) an originating chamber installed around the dispensing pump located at the beginning of a pipe line;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a pipe line;
- c) an outer containment piping section and flexible supply piping section interconnecting one chamber to the next through openings in the side wall of the chambers;
- d) a sealing device, mechanically sealing pipe entry and exit openings located in the side wall of the chambers, to the containment pipe, whereby the joint is liquid tight and secure;
- e) an originating plumbing assembly providing a means of fluid shut-off connected to the dispensing pump;
- and
- f) a terminating plumbing assembly providing an interface for the dispensing unit and flexible supply piping section connected to the above ground dispensing unit by means of a safety valve in the terminating chamber.
4 more elements
A secondarily contained underground piping system which connects the dispensing pump of an underground storage tank to an above ground dispensing unit, comprising;
- a) a originating chamber installed around the dispensing pump located at the beginning of a piping line, providing a means of surface access, secondary containment, leak collection and having at least one opening in one of its side walls for pipe;
- b) a terminating chamber installed under an above ground dispensing unit located at the end of a piping line, providing a means of surface areas, secondary containment, leak collection and having at least one opening in one of its side walls for pipe;
- c) a non-flexible containment piping section which is non-continuous comprising of two or more straight non-flexible pipe lengths joined together by couplings, having an inside diameter of sufficient size, and a directional bend radius of sufficient length to permit a flexible supply section to be inserted from one end to the other, said section interconnecting one chamber to the next chamber through the openings in the side wall of the chambers;
- d) a sealing device providing a means of sealing all pipe entry and exit openings in the side wall of the chambers, to the annular wall of the non-flexible containment pipe, whereby the joint is liquid tight and secure;
- and
- e) an originating plumbing assembly, providing a means of fluid shut-off and pump and flexible supply pipe interface, which is connected to the tank dispensing pump contained within the originating chamber.
3 more elements
A secondarily contained underground piping system for connecting the elements of the system including a dispensing pipe of an underground storage tank to an above ground dispensing unit, comprising:
- a) at least one chamber installed around at least one of the elements of the system;
- and
- b) a flexible piping connecting the elements consisting of an inner pipe member, an outer pipe member circumscribing the inner piper member, a plurality of circumferentially spaced ribs extending radially from one of said pipe members having a surface confronting and snugly engaging the other pipe member and defining a plurality of interstitial spaces between the pipe members;
- and the confronting surfaces of said ribs having a predetermined configuration in a longitudinal direction to permit migration of a fluid in said interstitial spaces in all directions.
1 more element
A secondarily contained underground piping system for connecting the elements of the system including a dispensing pipe of an underground storage tank to an above ground dispensing unit, comprising:
- a) at least one chamber installed around at least one of the elements of the system;
- and
- b) a flexible piping connecting the elements consisting of an inner and a outer pipe whereby the inside surface of the outer pipe has a plurality of internally facing longitudinal ribs in radial communication with the outside surface of the inner pipe in such a manner that a small interstitial space between both walls is created to permit fluid and gas migration from on end of the pipe section to the other.
A secondarily contained underground piping system for connecting the elements of the system including a dispensing pipe of an underground storage tank to an above ground dispensing unit, comprising:
- a) at least one chamber installed around at least one of the elements of the system;
- and
- b) a flexible piping connecting the elements consisting of an inner pipe contained by an outer pipe is in radial communication with the outside surface of the inner pipe in such a manner that a small interstitial space between both walls is created to permit fluid and gas migration in both a radial and longitudinal directions even under outside pressures created from underground burial conditions.
A secondarily contained underground piping system for connecting the elements of the system including a dispensing pipe of an underground storage tank to an above ground dispensing unit, comprising:
- a) at least one chamber installed around at least one of the elements of the system;
- and
- b) a flexible piping connecting the elements consisting of an inner pipe and a outer pipe is in radial communication with the outside surface of the inner pipe in such a manner that a small interstitial space between both walls is created to permit fluid and gas migration from one end of the pipe section to the other.
Dependencies are inferred from the claim text.