Method of removal of replacement pipe installed in an existing c

Details Method of removal of replacement pipe installed in an existing c Method of removal of replacement pipe installed in an existing c

1993-01-25

1995-09-05

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Repairing or restoring consumer used articles for reuse

138 97, 264230, B29C 6342

Patent

active

054476658

ABSTRACT:
A thermoplastic pipe in a reduced shape having a memory for the reduced shape is heated to make it pliable for installation in an existing conduit to be lined. The pipe is then expanded by passing a heated fluid into a pipe, or by the use of an inflatable plug or rounding device. The length of pipe which has been installed can be removed by heating to a pliable state to cause the pipe to return at least partially to its reduced form and remove. This ability to remove an installed length of replacement pipe allows for removal of a replacement pipe which is damaged.

REFERENCES:
patent: T900024 (1972-07-01), Hollander, Jr.
patent: 2974758 (1954-09-01), Harper et al.

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