초록 ▼

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

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.

대표청구항 ▼

The method of removing a section of thermoplastic pipe that has been installed in an existing conduit and that was manufactured in a folded form so as to retain a memory for such folded form so that when reheated to a pliable state will tend to retain that folded form, the method comprising: heating

The method of removing a section of thermoplastic pipe that has been installed in an existing conduit and that was manufactured in a folded form so as to retain a memory for such folded form so that when reheated to a pliable state will tend to retain that folded form, the method comprising: heating the pipe section to a pliable state to cause the pipe section to return at least partially to its folded form, attaching a pull cable to an accessible end portion of the pipe section at an access opening to the conduit, and pulling the pipe section while hot, pliable and at least partially folded from the conduit through the access opening by applying pulling tension to the pull cable.