Double wall helical pipe and strip configuration for forming sam

Details Double wall helical pipe and strip configuration for forming sam Double wall helical pipe and strip configuration for forming sam

1974-10-21

1978-12-12

Aegerter, Richard E.

Pipes and tubular conduits

Spirally seamed

138103, 138121, 138129, 138148, 138173, F16L 916

Patent

active

041291522

ABSTRACT:
Double wall helical pipe formed from a single metal strip, pipe forming method and configuration of strip for forming such pipe. A metal strip is formed with pipe seam elements and curled into overlapped helical convolutions, and the seam elements are secured together to provide a helical pipe seam. One or both pipe walls may be corrugated.

REFERENCES:
patent: 2067801 (1937-01-01), Taylor
patent: 2068022 (1937-01-01), Hammel
patent: 2330966 (1943-10-01), Gottwald et al.
patent: 2713381 (1955-07-01), Seck
patent: 2739089 (1956-03-01), Hageltorn
patent: 3199541 (1965-08-01), Richitelli
patent: 3330303 (1967-07-01), Fochler
patent: 3621884 (1971-11-01), Trihey
patent: 3865146 (1975-02-01), Meserole

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