Apparatus for relining an underground gas line or the like witho

Details Apparatus for relining an underground gas line or the like witho Apparatus for relining an underground gas line or the like witho

1982-12-13

1983-10-18

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With work feeding or handling means

29234, 29235, 2940209, 138 97, 156 71, 156 83, 156 84, 156 94, 156294, 156391, 156423, 156499, 156543, 264 36, 264230, B32B 3500

Patent

active

044103913

ABSTRACT:
A method and apparatus for repairing or relining an underground pipeline without having to excavate the pipe is enabled by attaching an expandable sealing unit to the end of a predetermined length of flexible tubing and feeding it through the pipeline. The flexible tubing is fed through the existing pipeline from a point beyond where the existing pipeline exits the earth, usually within the basement of a building. Once positioned in the desired location, the expandable sealing unit is expanded to form a tight seal at the desired location within the pipe by means of heating the expandable sealing unit by a heating unit connected to the source of energy through electrical conductors which pass through the flexible tubing.

REFERENCES:
patent: 4135958 (1979-01-01), Wood
patent: 4233101 (1980-11-01), Scragg et al.
patent: 4295494 (1981-10-01), McGowan et al.

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