Method of installing a substantially rigid thermoplastic pipe in

Details Method of installing a substantially rigid thermoplastic pipe in Method of installing a substantially rigid thermoplastic pipe in

1993-01-25

1995-04-04

Corbin, David H.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

156 94, 156287, 405156, 405184, F16L 1028, F16L 55165

Patent

active

054031206

ABSTRACT:
A substantially rigid thermoplastic pipe for repairing a pipeline by installing the thermoplastic pipe in an existing underground pipeline, such as a service lateral, having access from only one end and a bend along its length is provided. The thermoplastic pipe may be manufactured in reduced form so as to have a memory for the reduced form, is heated to make it pliable for installation, and is pulled into the lateral from the access opening using a cable-and-pulley arrangement anchored temporarily at the intersection of lateral and main pipelines. When installed in a lateral, it is rounded and cooled in its rounded shape by passing steam under pressure through passages along the folds of the pipe while its leading end is restricted.

REFERENCES:
patent: 2974758 (1954-09-01), Harper et al.
patent: 4637756 (1987-01-01), Boles
patent: 4724108 (1988-02-01), Jurgenlohmann et al.

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