Multi-layer pipe with single corrugation in inner wall

Details Multi-layer pipe with single corrugation in inner wall Multi-layer pipe with single corrugation in inner wall

1979-03-29

1980-09-02

Phillips, Charles E.

Pipes and tubular conduits

Spirally seamed

138135, 138150, 138122, F16L 906, F16L 918

Patent

active

042201810

ABSTRACT:
A multi-layer, spirally wound tube or pipe product with a substantially smooth inner wall having a single, helical corrugation and a corrugated exterior wall. The pipe has an inner pipe layer consisting of an elongated sheet of flat material curled into adjacent, helical convolutions and an outer pipe layer consisting of an elongated sheet of corrugated material curled into adjacent, helical convolutions about the inner pipe layer. The inner and outer pipe layers share a common helical seam. A single, continuous helical corrugation is located in the inner pipe layer along the helical seam, thereby causing the seam to be located within the single corrugation.

REFERENCES:
patent: 3340901 (1967-09-01), Lombardi
patent: 4108212 (1978-08-01), Anderson et al.
patent: 4129152 (1978-12-01), Davis

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