Claims
- 1. A method for forming a double containment pipeline section comprising:
adhering granular material on a first face of a tape; wrapping the tape around a primary pipeline section; and forming a secondary pipeline section around the wrapped primary pipeline section, wherein the granular material defines an annulus between the primary and secondary pipeline sections.
- 2. A method as recited in claim 1 wherein forming comprises defining an annulus between the primary and secondary pipeline sections having a radial thickness no greater than about 1 mm.
- 3. A method as recited in claim 1 wherein wrapping comprises wrapping the tape around the primary pipeline section sandwiching the granular material between the tape and the primary pipeline section.
- 4. A method as recited in claim 1 wherein wrapping comprises:
wrapping the tape around the primary pipeline section with the granular material on the outside of the tape; and wrapping a second sealing tape over the granular material sandwiching the granular material between the two tapes.
- 5. A method as recited in claim 1 wherein forming comprises:
wrapping a resin embedded material over the wrapped tape; and curing the resin embedded material forming a secondary pipeline section.
- 6. A method as recited in claim 1 further comprising:
forming a primary pipeline section from resin embedded material; and partially curing the primary pipeline section prior to wrapping the tape having the adhered granular material.
- 7. A method as recited in claim 1 further comprising:
forming a primary pipeline section from resin embedded material; sealing off the resin embedded material prior to wrapping the tape having the adhered granular material; and curing the formed primary and secondary pipeline sections.
- 8. A method as recited in claim 7 wherein sealing off the resin embedded material comprises wrapping the formed primary pipeline section with a plastic tape.
- 9. A method as recited in claim 1 wherein adhering granular material to the tape comprises pulling a tape having a tacky adhesive on a first face through a container of granular material adhering a layer of granular material on the first face.
- 10. A method as recited in claim 1 wherein adhering granular material to the tape comprises sprinkling granular material on a face of the tape having a tacky adhesive.
- 11. A method as recited in claim 1 wherein adhering comprises adhering sand on a first face of a tape.
- 12. A method as recited in claim 1 wherein wrapping a tape around a primary pipeline section comprises wrapping a tape around a pipe fitting.
- 13. A method as recited in claim 1 further comprising helically winding a pair of spaced apart wires around the primary pipeline section so as to be in contact with the granular material.
- 14. A method as recited in claim 1 wherein the granular material comprises particles and wherein a majority of said particles are in contact with the primary pipeline section.
- 15. A method for forming a double containment pipeline section comprising:
wrapping a tape having a tacky adhesive on one face around a primary pipeline section with the face having the tacky adhesive on the outside; applying a granular material on the taped pipeline section, adhering a layer of granular material on the tacky adhesive; and forming a secondary pipeline section over the granular material layer wherein the granular material layer defines an annulus between the primary and secondary pipeline section.
- 16. A method as recited in claim 15 wherein the granular material comprises particles wherein a majority of said particles are in contact with the secondary pipeline section.
- 17. A method as recited in claim 15 section wherein forming comprises defining an annulus between the primary and secondary pipeline sections having a radial thickness no greater than about 1 mm.
- 18. A method for forming a double containment pipeline section comprising:
applying a layer of adhesive over primary pipeline section; applying a granular material on the adhesive forming a permeable layer adhered around the primary pipeline section; and forming a secondary pipeline section over the granular material covered primary pipeline section wherein the granular material defines an annulus between the primary and the secondary pipes.
- 19. A method as recited in claim 18 section wherein forming comprises defining an annulus between the primary and secondary pipeline sections having a radial thickness no greater than about 1 mm.
- 20. A method as recited in claim 18 further comprising wrapping a sealing layer over the granular material covered primary pipeline section.
- 21. A method as recited in claim 18 wherein applying a granular material comprises applying sand.
- 22. A method as recited in claim 18 wherein the granular material comprises particles, and wherein a majority of said particles adhered around the primary pipeline section are in contact with the secondary pipeline section.
- 23. A method for forming a double containment pipeline section comprising:
forming a primary pipeline section having a granular material adhered over an outer surface of the primary pipeline section; and forming a secondary pipeline section over the granular material wherein the granular material defines an annulus between the primary and the secondary pipes.
- 24. A method as recited in claim 23 wherein forming a primary pipeline section comprises:
forming a primary pipeline section having tacky adhesive on its outer surface; and applying a granular material on the adhesive forming a permeable layer around the primary pipeline section.
- 25. A method as recited in claim 23 wherein the granular material defines the annulus between the primary and secondary pipeline sections having a radial thickness no greater than about 1 mm.
- 26. A method as recited in claim 23 wherein the granular material comprises particles wherein a majority of said particles are in contact with the secondary pipeline section.
- 27. A method as recited in claim 23 wherein applying a granular material comprises applying sand.
- 28. A method for forming a double containment pipeline section comprising:
forming a primary pipeline section; forming a secondary pipeline section surrounding the primary pipeline section; and applying a layer of granular material between the primary and secondary pipeline sections wherein the granular material comprises particles and wherein a majority of the particles are in contact with at least one of said primary and secondary pipeline sections.
- 29. A method as recited in claim 28 wherein a majority of the particles are in contact with primary pipeline section and wherein a majority of the particles are in contact with the secondary pipeline section.
- 30. A method as recited in claim 28 wherein the granular material defines an annulus having a radial thickness no greater than about 1 mm.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a divisional U.S. application Ser. No. 09/693,085, filed on Oct. 20, 2000, which is a continuation application of U.S. application Ser. No. 09/487,635, filed on Jan. 11, 2000, which is a divisional of U.S. application Ser. No. 08/806,123, filed on Feb. 14, 1997 and issued as U.S. Pat. No. 6,026,862.
Divisions (2)
|
Number |
Date |
Country |
Parent |
09693085 |
Oct 2000 |
US |
Child |
10645267 |
Aug 2003 |
US |
Parent |
08806123 |
Feb 1997 |
US |
Child |
09487635 |
Jan 2000 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09487635 |
Jan 2000 |
US |
Child |
09693085 |
Oct 2000 |
US |