Rehabilitating sewer lines is critical and fascinating work that requires above ground and underground activity. Here is the typical four-step process for rehabilitating sewer lines; emergency replacements or repairs may follow different protocols:
1. Set up Bypass Pumps and Piping
Two pumps (a primary and back up) are staged at a manhole upstream; the primary pump has an enclosure to minimize noise. Bypass piping is installed to route sewer flows around the work area to a manhole downstream of the sewer line being repaired or rehabilitated.
2. Clean and Inspect Sewer Lines
Using high pressure water, the sewer lines are cleared of grease and debris. This process allows us to send a camera down the line and inspect the pipes to view the condition of the pipes.
3. Install Liner
The liner is delivered to the site, is inserted into the upstream manhole and is “pushed” or “inverted” through the pipe to the downstream manhole using either water or air pressure. The liner is then heated using water or steam and cured to produce a fully-structural pipe inside the existing pipe.
4. Repair and Rehab Manholes
To complete the rehabilitation process, manholes are repaired and a corrosion-resistant liner is applied to the inside walls.