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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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Spiral Wound Pipe Lining

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 do not need to be upsized. 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 surface inside the existing pipe, restoring it to near-new condition.

The work involves the following steps:

  • Remove roots 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
  • Lower a winding machine into the manhole
  • Insert the liner strip into the sewer pipe through a manhole 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
  • Push or pull 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 in the liner with grout
  • Remove the bypass system, if any
  • Conduct quality control inspections