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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

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Cured-in-Place Pipe-Lining (CIPP)

preparing to install the pipe linerWork crews access the sewer from manholes to insert a flexible liner inside the old pipe. Hot water or steam inflates and cures the liner, which gradually hardens to form a rigid, smooth surface that seals cracks and restores the pipe to near-new condition.

Chemical Odors

People who live and work near a CIPP repair project can sometimes smell a chemical odor during the pipe-lining work. The odor is from the chemical styrene, which is in the resin liner installed inside the pipe. The odor dissipates quickly once the installation process is complete. The amount of airborne styrene produced by the
lining process is not expected to cause health issues for workers or the

pipe linerMore Styrene Information Online

What to Expect During Cured-in-Place Pipe Lining

  • Construction crews do most of the sewer lining work through manholes in the streets.
  • Spot repairs may require excavation prior to lining process.
  • Preparation and restoration will take a couple of days to complete but the pipe lining process should only take one day at each location.
  • You may notice an odor during the pipe lining process but it will dissipate quickly.
  • There may be inactivity between some phases of this process.
  • Typical work hours are 7:00 a.m. to 6:00 p.m. Monday through Friday, but the contractor may schedule work during the same hours on Saturdays.
  • To help reduce odor run water in all sinks and basins to make sure p-traps are filled, and cover floor drains with a wet towel or a zip bag filled with water. Be sure to cover the drain completely.

Performing spot repair