Today we’re sharing the second part of our trenchless sewer repair video series, which shows what goes into this type of repair (and what owners can expect). In the previous video, we covered some of the preparation work before the actual repair. Now our plumbing team is getting into the thick of things as they install the new pipe and access point.
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 simultaneously 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 a hydraulic ram used to drag the new line through the tunnel. They also install a faceplate to reinforce the worksite and help protect the surrounding landscape. They attach 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. Take advantage of our sewer service special and make sure that your sewer lines are in good working order. We’ve proudly served the greater Seattle and Bellevue areas since 1968!