How Pipe Lining Works


How Pipe Lining Works

June 20, 2018

In the third installation of our trenchless sewer repair video series, our team is working to repair a broken sewer line using a method known as cured in place pipe (CIPP).

CIPP is great technique for repairing cracks or worn spots in a sewer line because it doesn’t require that the old line be dug out for replacement. It also creates a solid piece of pipe that conforms to the path of the original line without needing any welded joints.

The Need For Speed

After clearing the old pipe of any obstructions, the team will mix together a two-part epoxy resin that consists of a base and a hardener. When combined, the epoxy will cure into a hard and durable plastic that will last for decades. After the epoxy is mixed, it is poured into a fabric liner cut to fit the length of the repair. Installation crews have to work fast after the epoxy is mixed because they only have approximately 60 minutes before everything starts to harden in place.

The Curing Process

Once coated, the pipe liner is placed in a pressure tube, which is then connected to one end of the original sewer line. The crew then uses either air or water pressure to invert the liner. This means the liner is turned inside out while being forced through the old pipe, causing the epoxy side of the liner to stick to the walls of the original pipe. Hot water (reaching temperatures of 212 degrees Fahrenheit) is then circulated through the pipe to activate the resin and evenly cure the epoxy. The installation crew must carefully monitor temperatures during this process. If the epoxy is overheated, it won’t cure properly. If it’s cooled too quickly, the liner can shrink.

Once everything is successfully cured, owners can relax knowing that their sewer line is made from a single piece of durable pipe with no joints or cracks to be exploited by plant roots or rats!

Your Local Sewer Experts

Contact the experts at Best Plumbing to learn more about our sewer line services. We have teams specializing in both residential and commercial projects and we’re here to help, no matter your plumbing needs.

Visit our blog and YouTube channel for more great plumbing insights!

Plumbing Archives