초록

Methods for forming double containment pipeline sections are provided where granular material is used to define the annuluses of such pipeline sections.

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What is claimed is: 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

What is claimed is: 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.