Almost all, if a polypropylene pipe is damaged, solve the problem by replacing it. Usually, a section with a hole or crack is simply cut out, and then a piece of new tube is soldered using couplings. This is a good way, but not always possible in hard-to-reach places. There are much simpler and faster methods.
1. Overlay repair
For such a repair, you need to fix on the soldering iron instead of the usual nozzles two tubes cut along the length. One turns outward with a concave side, and the second with a concave side.
Then we take a piece of PP pipe 30-50 mm long, and cut it along. Now we lean the soldering iron on the damaged area of the pipeline with a concave nozzle, and on the curved one we apply this homemade pad.
We wait a couple of seconds until the polypropylene starts to melt, and then we glue the overlay on the damage.
For reliability, we can put a clamp on top. That’s it, there will never be a leak in this place.
2. Repair the hole with a plug
It happens that when drilling, the plumbing hidden in the wall is damaged. In this case, you can close this hole with a simple plug. This will require a special repair rod for PP, or a regular strip cut from a pipe.
For repair, we fix a pin on the soldering iron instead of a nozzle, the diameter of which is slightly larger than the existing hole. We insert it into the damage, and heat its walls. At the same time, we heat the rod in the hole of the soldering iron.
Now insert the hot rod into the hole in the pipe. It is important not to drive it deep so as not to block the passage. We wait until the polypropylene hardens, and carefully cut off the cork.
3. Self-tapping repair
A small hole in the pipe can be repaired by screwing in a self-tapping screw with a wound tape.
After that, we coat the joint with epoxy. Until she grabs, we put an elastic band on top, and press it with a clamp. It also turns out to be very reliable.