Definition - What does Pipe Relining mean?
Pipe relining is a pipe repair process in which a weak or damaged section of pipe is reinforced with a liner -- either a resin-soaked tube made of felt or other semi-permeable material, or a flexible section of tubing -- sized to fully encapsulate the pipe's interior. Pipe relining is used to repair a small section of pipe when complete replacement is not required.
Trenchlesspedia explains Pipe Relining
When you use a section of pipe, either a short section for spot repair or a continuous section that lines the entire pipe, you pull the lining into place and friction seals the pipe in place, isolating -- and preventing leaks in -- the damaged or weakened area. The lining remains in place after it's installed.
Another method relies on an epoxy liner. The pipe is heated with hot compressed air and an abrasive agent is blown through the pipe to remove any rust or contaminants. Then, epoxy is blown into the pipe where it adheres to the pipe's walls. A second round of hot compressed air is blown into the pipe to ensure the epoxy's even distribution and to assist in curing the epoxy.
Lining with spirally wound PVC pipe is much the same as as continuous pipe lining or lining for a spot repair, except the liner is a spiral of material. Inserted into the existing pipe, the spiral is then expanded to line the interior of the pipe. Bracing is installed to support the liner as it's grouted into place. After the grout has cured, the bracing is removed.