Method of lining pipes
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United States of America Patent
Stats
-
Aug 21, 1990
Grant Date -
N/A
app pub date -
Aug 19, 1988
filing date -
Dec 26, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of lining a pipe with a rigid plastic tube inserted in the pipe by enlarging the tube from inside with application of heat and pressure. The method includes enlarging the tube by an electrically heatable enlarging pig moved through the tube, retaining the enlarged portion of the plastic tube with compressed air supplied to the interior of the tube, and preheating the unenlarged portion of the plastic tube with a portion of the compressed air heated by being passed through air heating channels of the pig. The use of the pig eliminates the material limitations to be otherwise imposed on the tube, and therefore the softening point, of the plastic tube. The preheating of the unenlarged portion of the plastic tube renders the pig movable through the tube at an increased speed to achieve an improved work efficiency.
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