A pipeline system is enclosed including unlined or plastic lined pipes. A mechanical metal to metal connection is employed that can provide a fluid tight seal. A pipe coupling may be employed to span the connection. Plastic lined pipes can have their plastic liners connected to form a fluid tight bl
A pipeline system is enclosed including unlined or plastic lined pipes. A mechanical metal to metal connection is employed that can provide a fluid tight seal. A pipe coupling may be employed to span the connection. Plastic lined pipes can have their plastic liners connected to form a fluid tight bladder. Electro-fusion may be employed.
대표청구항▼
1. A pipe connection assembly comprising: a first pipe section and a second pipe section, each of the first pipe section and the second pipe section including: a metal tube having a length, an inner surface defining an inner diameter, an outer surface with an outer diameter, and a wall thickness def
1. A pipe connection assembly comprising: a first pipe section and a second pipe section, each of the first pipe section and the second pipe section including: a metal tube having a length, an inner surface defining an inner diameter, an outer surface with an outer diameter, and a wall thickness defined by the distance between the inner surface and the outer surface;a pipe coupling for mechanically engaging the first pipe section to the second pipe section, the pipe coupling formed as a cylindrical tube and including a first tubular end configured to mechanically engage the first pipe section and a second tubular end configured to mechanically engage the second pipe section, the pipe coupling being sized to be positioned within the inner diameter of the first pipe section and the pipe coupling including outwardly extending teeth; and,a press ring having an inside diameter smaller than the outer diameter of the metal tube and the press ring configured to be installed encircling the metal tube radially outwardly of the pipe coupling and to deform and hold the metal tube radially inwardly into engagement with the teeth. 2. The pipe connection assembly of claim 1 wherein the wall thickness of each of the first pipe section and the second pipe section is 0.250 inches or less. 3. The pipe connection assembly of claim 1 wherein at least the first pipe section includes a retaining flange secured without welding onto the outer surface of the metal tube, the retaining flange having an axial length and extending radially and outwardly from the outer surface of the metal tube near an end of the metal tube. 4. The pipe connection assembly of claim 3 wherein the retaining flange is connected by a method selected from the group consisting of threading, plastic deformation or frictional engagement. 5. The pipe connection assembly of claim 1 wherein each of the first pipe section and the second pipe section include a plastic liner formed of a plastic material compatible with electro-fusion, the plastic liner having a length and an inner diameter, wherein the plastic liner is positioned within the metal tube. 6. The pipe connection assembly of claim 5 further comprising an electro-fusion assembly energizable to cause melting of the plastic material to fuse the plastic liners of the first pipe section and the second pipe section together. 7. The pipe connection assembly of claim 1 wherein the pipe coupling includes: a metal coupling shell having a length, a first end, a second end, an inner surface, and an outer surface; a plastic coupling sleeve disposed within the metal coupling shell, the plastic coupling sleeve having a length and an electrical conductor accommodated therein; and an electrical contact for conducting electricity to the electrical conductor. 8. The pipe connection assembly of claim 7 wherein the length of the metal coupling shell exceeds the length of the plastic coupling sleeve and the metal coupling shell is sized to accommodate the metal tube axially inserted in the first end. 9. The pipe connection assembly of claim 1 wherein the press ring is formed to cause deformation of the metal tube over the teeth. 10. The pipe connection assembly of claim 1 wherein the metal tube includes a belled end with a larger inner diameter than the inner diameter through an adjacent portion of the metal tube and the pipe coupling is positionable within the belled end and has an inside diameter substantially equal to or greater than the inner diameter. 11. The pipe connection assembly of claim 1 wherein the teeth include a tooth formed as a continuous annular protrusion about the outer surface of the pipe coupling. 12. The pipe connection assembly of claim 1 wherein the pipe coupling is formed integral with the first pipe section. 13. The pipe connection assembly of claim 1 wherein the pipe connection assembly is assembled with the pipe coupling mechanically engaging the first pipe section and the second pipe section. 14. A method for joining a first pipe section to a second pipe section, each of the first pipe section and the second pipe section including: a metal tube having a length and a wall with an inner surface defining an inner diameter, an outer surface with an outer diameter and a wall thickness defined by the distance between the inner surface and the outer surface,the method comprising:inserting a pipe coupling into the inner diameter of a first metal tube of the first pipe section and mechanically engaging the pipe coupling to a second metal tube of the second pipe section;installing a press ring to encircle the wall of the first metal tube, the press ring having an inner diameter smaller than a diameter across the outer surface and installing the press ring includes deforming the metal tubular wall of the first pipe section radially inwardly into mechanical engagement with teeth on an outer diameter of the pipe coupling; andleaving the press ring in place encircling the wall of the first pipe section to hold the wall in mechanical engagement with the pipe coupling. 15. The method of claim 14 wherein the pipe coupling includes further outwardly extending teeth on the outer diameter and mechanically engaging the second pipe section to the pipe coupling includes deforming the second metal tube into engagement with the further outwardly extending teeth and installing a second press ring to encircle the second metal tube and to hold the second metal tube in engagement with the further outwardly extending teeth. 16. The method of claim 15 wherein deforming and installing are completed at the same time wherein installing the second press ring deforms the second metal tube radially inwardly. 17. The method of claim 15 wherein the second metal tube includes a belled end and mechanically engaging includes inserting the pipe coupling into the belled end prior to deforming. 18. The method of claim 14 further comprising fusing a first plastic liner of the first pipe section to a second plastic liner of the second pipe section. 19. The method of claim 18 wherein fusing includes electro-fusing. 20. The method of claim 18 wherein fusing includes employing a plastic sleeve as an intermediate joint between the first plastic liner and the second plastic liner. 21. The method of claim 18 wherein the pipe coupling includes a metal coupling shell having a length defined between a first end and a second end, an inner surface, and an outer surface; and a plastic coupling sleeve disposed within the metal coupling shell, the plastic coupling sleeve having a length and an electrical conductor; contacts on the outer surface of the metal coupling shell for conducting electricity to the electrical conductor; wherein the length of the metal coupling shell exceeds the length of the plastic coupling sleeve; and wherein fusing includes inserting the first plastic liner into contact with the plastic coupling sleeve and placing the second plastic liner into contact with the plastic coupling sleeve and connecting an electrical supply to the contacts to energize the electrical conductor to fuse the first plastic liner and the second plastic liner to the plastic coupling sleeve to form a containment seal for fluids. 22. A method for joining a first pipe to a second pipe, wherein the first pipe includes: a metal tube formed with a bell end, wherein the bell end has an inner diameter greater than a normal inner diameter along a middle portion of the metal tube;a plastic liner installed in the metal tube, the plastic liner formed of a plastic material compatible with electro-fusion, the plastic liner having a length, an inside diameter and an outer diameter substantially equal to the normal inner diameter, the plastic liner being positioned within the metal tube with an end of the plastic liner extending into the bell end with an annulus formed between the plastic liner and the bell end;a cylindrical pipe coupling mechanically engaged in the bell end and including a protruding portion extending axially beyond the bell end; andan electro-fusion assembly in the annulus positioned between a base of the bell end and an end of the pipe coupling, the electro-fusion assembly including: a plastic sleeve connected to the plastic liner, the plastic sleeve having an extension extending axially beyond the plastic liner with a bore diameter greater than the inside diameter; an electrical conductor supported by the extension of the plastic sleeve; and an electrical contact for conducting electricity to the electrical conductor;and wherein the second pipe includes:a metal tubular wall formed with a bell-shaped end, the bell-shaped end having an outer surface;a liner installed in the metal tubular wall, the liner formed of a plastic material compatible with electro-fusion, the liner being positioned within the metal tubular wall with a second end of the liner extending into the bell-shaped end with a second annulus formed between the liner and the bell-shaped end; and wherein joining includes: inserting the protruding portion of the pipe coupling into the second annulus to position the second end of the liner within the extension of the plastic sleeve; electro-fusing the second end to the plastic sleeve to form a fluid tight seal therebetween; and installing a press ring to encircle the bell-shaped end, the press ring having an inner diameter smaller than a diameter across the outer surface and installing the press ring includes deforming the bell-shaped end radially inwardly into mechanical engagement with teeth on an outer cylindrical wall of the pipe coupling; and leaving the press ring in place encircling the bell-shaped end to hold the bell-shaped end in mechanical engagement with the pipe coupling. 23. A pipe connection comprising: a first pipe having a length, an inner surface defining an inner diameter, an outer surface with an outer diameter, and a wall thickness defined by the distance between the inner surface and the outer surface;a second pipe having a cylindrical wall with a cylindrical outer surface and a cylindrical inner bore;a pipe coupling mechanically engaging the first pipe to the second pipe, the pipe coupling formed as a cylindrical tube with outwardly extending teeth and including a first tubular end mechanically engaged within the inner diameter and a second tubular end mechanically engaged within the cylindrical inner bore;a first press ring having an inside diameter smaller than the outer diameter of the first pipe, the press ring encircling the first pipe radially outwardly of the pipe coupling and deforming the first pipe radially inwardly into engagement with the teeth on the first tubular end; anda second press ring having a diameter smaller than the cylindrical outer surface of the second pipe, the second press ring encircling the second pipe radially outwardly of the pipe coupling and deforming the second pipe radially inwardly into engagement with the teeth on the second tubular end.
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