Pipe liner process and apparatus

Details Pipe liner process and apparatus Pipe liner process and apparatus

B - Operations, Transporting

29

C

18/758, 154/53.2

B29C 67/00 (2006.01) B29C 63/34 (2006.01) F16L 57/00 (2006.01)

Patent

CA 1312716

59 IMPROVED PIPE LINER PROCESS AND APPARATUS ABSTRACT OF THE DISCLOSURE Method and apparatus are provided for lining a pipe wherein a thermoplastic liner is initially formed in a cylindrical shape with a diameter slightly larger than the internal diameter of the pipe. The liner is temporarily deformed at an elevated temperature to a different cross-section, preferably U-shaped, to reduce its overall cross-sectional dimension to facilitate insertion into the pipe to be lined. Once inserted, the pipe liner is reheated to the crystallization temperature of the thermoplastic material to cause the liner to return to its original cylindrical shape. Pressure within the liner is also increased in two stages to cause the liner to conform to the interior surface of the pipe. An expansion pig may also be employed to ensure even more exact conformance. After expansion, ends of the liner which extend beyond the pipe are flared into engagement with the pipe flanges. For lining pipe normally containing in service fluid under pressure, the liner, after insertion into the pipe, can be mechanically reformed to engage the interior wall of the pipe. The normal service pressure is then used to maintain the liner in its generally cylindrical shape over the time necessary to completely relieve the stresses in the liner tending to cause the liner to return to its deformed shape.

571626

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