information
Storm damage recovery

Spiral Wound Pipe Lining

Information
Spiral Wound Pipe Lining is a trenchless method of sewer construction. It requires little or no digging and can be installed when sewage and stormwater are flowing through the pipe. It is suitable for repairing both short and long runs of pipes that allow for lower overall capacity.

Spiral Wound Pipe Lining involves inserting a flexible liner strip inside the existing pipe and sealing the edges of the strip together to form a liner inside the pipe. The liner essentially forms a smooth structural surface inside the existing pipe, restoring it to near-new condition.

The work involves the following steps:

  • Remove roots and other protrusions from the pipe and flush debris from the pipe.
  • Set up a sewer bypass system, if necessary, to re-route wastewater to other nearby pipes during the pipe lining process.
  • Dig an access pit to required depth if needed. 
  • Lower a winding machine into a maintenance hole or access pit.
  • Insert the liner strip into the sewer pipe through a maintenance hole or access pit from a spool at the surface.
  • Use the winding machine to seal the edges of the strip together and gradually build a liner inside the pipe. The winding machine can either move along the pipe, building the liner as it progresses, or push the liner into place as it is formed by the winding machine. 
  • Open and reinstate sewer service lateral connections that were covered by the pipe lining.
  • Fill any spaces between the liner and the original pipe with grout.  
  • Remove the bypass system, if any.
  • Conduct quality control inspections.