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Most City offices closed Wednesday, June 19, to observe Juneteenth

The City of Portland recognizes Juneteenth as a formal day of remembrance to honor Black American history and the end of slavery in the United States. Learn about Juneteenth.

Sliplining

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Sliplining is a trenchless method of sewer construction. It requires less digging and often less time to complete than other sewer repair methods. It is suitable for repairing both short and long runs of pipes that do not need to be upsized. 

Sliplining is typically used in locations where digging long trenches may be difficult. It involves digging a sending and receiving pit to accommodate specialized equipment crews use to push or pull a new pipe into an existing, deteriorating pipe.

The work involves the following steps:

  • Dig short trenches to expose existing sewer service lateral connections where adjacent properties are connected to the mainline public sewer.
  • Disconnect existing sewer service laterals from the mainline public sewer pipe to be repaired and provide a temporary connection to maintain sewer service.
  • Cover the sewer service lateral trenches with steel plates and proceed with the sliplining process.
  • Remove roots from the pipe and flush debris from the pipe.
  • Dig a sending and a receiving pit to the required length and depth.
  • Lower sliplining equipment into the sending and receiving pit.
  • Set up a sewer bypass system, if necessary, to re-route wastewater to other nearby pipes during the sliplining process.
  • Use equipment to pull or push one or more segments of new sewer pipe into the existing sewer pipe being repaired.
  • Open and reconnect sewer service lateral connections that were covered by the sliplining process.
  • Cover open pits with steel plates—or secure the pits with fencing—at the end of each day as needed while work is in progress.
  • Fill in any spaces with grout.
  • Remove the bypass system, if used.
  • Backfill pits with sand or gravel and apply temporary asphalt patches.
  • Conduct quality control inspections.
  • Complete permanent pavement restoration of patched pits after work passes inspection.