Method of inserting rigid plastic lining tube through pipe
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United States of America Patent
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-
Dec 10, 1991
Issued Date -
N/A
app pub date -
Dec 18, 1990
filing date -
Jul 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In inserting a rigid plastic tube through a pipe while paying out the tube from a drum having the tube wound thereon in a flat form, a heating fluid is supplied into the plastic tube to pass the fluid from its one end toward the other end thereof and thereby heat and soften the plastic tube over the entire inner peripheral surface of the tube. The plastic tube as wound on the drum can be heated and softened uniformly at every portion over the entire length thereof and can further be held so softened also during the insertion of the tube through the pipe. The tube can be easily passed through an intermediate bent pipe portion, if any, and efficiently inserted through the pipe.
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