Sewer Repair Seattle

28 Feb. 20

Trenchless Sewer Replacement – Day Two

Today we’re sharing more about trenchless sewer repair. Take a look at this video, which shows what goes into this type of repair and what owners can expect. In the previous post, we covered some of the preparation work before the actual repair. We also want to let you know how our plumbing team gets into the thick of things as they install the new pipe and access point.

Joining Pipes

For this particular job, our team used a welding process call butt welding (also known as heat fusion) to join to pieces of pipe together to fit the length repair site. This method involves simultaneous heating both pieces of HDPE – High Density Polyethylene – up to 400-450 degrees Fahrenheit and pressing them together for 4.5 minutes per inch of pipe. When done correctly, the joint between the two pieces of pipe becomes indistinguishable.

Getting Ready to Pull

Next, our team members install the hydraulic ram used to drag the new line through the tunnel, making sure to use a faceplate to reinforce the worksite and help protect the surrounding landscape. They install a bursting cone on the other end of the new line and start pulling. As it travels, the bursting cone breaks up the old pipe and expands the bore diameter slightly larger than the new pipe — helping reduce friction. The new pipe travels approximately 1-2 feet per pull.

Considering the Future

While part of the team focuses on pulling the new line, another one of our plumbers works on a new cleanout point. After the repair is complete, they’ll make a patch between the original plumbing and the repaired section. Then they’ll create a covered entrance point so that the section can be easily accessed in the future if it ever needs to be examined with a camera scope or cleaned out. All the pipe fittings are equipped with shielded Fernco to prevent plant roots from growing into connection points.

If you have any questions about sewer repairs or replacements, give Best Plumbing a call at 206-633-1700. Before disaster strikes, make sure that your sewer lines are in good working order. We’ve proudly served greater Seattle and Bellevue areas since 1968!