Method for installing a pipe liner
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United States of America Patent
Stats
-
Sep 13, 1994
Issued Date -
N/A
app pub date -
May 5, 1993
filing date -
Jun 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for installing a pipe liner in a pipe includes the steps of reducing the diameter of the liner, so that it can be positioned within the pipe, installing the liner in the pipe, enlarging an upstream end of the liner, disposing a liner expander within the upstream end of the liner, pressurizing the upstream end of the liner with a heated fluid, the temperature of the heated fluid being sufficient to soften the liner, and the pressure of the heated fluid being sufficient to propel the liner expander from the upstream end of the liner to a downstream end, allowing a portion of the heated fluid to bypass the liner expander for heating and softening the liner ahead of the expander, and reducing the temperature of the pressurizing fluid to cool the liner below the softening temperature, to allow it to stiffen and form a liner within the pipe.
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