Method for forming double containment pipeline sections

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 a porous 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 as recited in claim 1 wherein adhering comprises providing a tacky adhesive on the first face of the tape and applying the granular material on said first face of the tape.

16. A method as recited in claim 1 further comprising helically winding a pair of spaced apart wires around the primary pipeline section and within the annulus.

17. A method as recited in claim 1 wherein wrapping the tape comprises wrapping the tape with the adhered granular material around the primary pipeline section.

18. A method for forming a double containment pipeline section comprising: adhering granular material on a first face of a tape; wrapping the tape with adhered granular material around a primary pipeline section such that the tape is sandwiched between the granular material and the primary pipeline section; and forming a secondary pipeline section around the wrapped primary pipeline section, wherein the granular material defines a porous annulus between the primary and secondary pipeline sections.

19. A method as recited in claim 18 wherein adhering comprises providing a tacky adhesive on the first face of the tape and applying the granular material on said first face of the tape.

20. A method as recited in claim 18 further comprising helically winding a pair of spaced apart wires around the primary pipeline section and within the annulus.