I have an existing drain pipe that takes water from our roof catchment, and sends it down into our drinking water tank (this is our household water supply). We now have a new building, and I wish to route the extra rain water from this roof into the same pipe. So I want to add a T-junction to this existing pipe, and route the new roof pipe into it.
I have repaired broken in-ground agricultural pipe sections before, but had (too much) trouble trying to insert joiners as there is no "give" in the buried pipe. Eventually I used rubber-sleeve type joins, but am unsure of using these with drinking water.
So, short of digging up 20 metres of pipe to get some extra bend/movement, with an existing 100mm UPVC "poly" pipe in the ground, is there technique for adding a new T-intersection?
Not relevant: Add T fitting to pipe
Best Answer
One technique with a little more digging, but not a lot, is to cut out a section of pipe, add 4 elbows to make an offset and put the tee in the offset.
Depending on what fittings you can get, there are also "saddle" or "snap" tees made to attach by clipping onto the pipe (and drilling a hole, and gluing, typically.)
This assumes that the pipe size is sufficient for the flow from both roofs - otherwise, you might be better off with a new pipe from the new roof right to the tank.