3" Copper Plumbing Return
Quote:
Originally Posted by speedball1
You gave us all the information we need except what material the flange is made of and what secures it to the copper pipe. We have to know this in order to help. Let us know and get a answer back ASAP. Are you the same Henny with a cabin you wish to add a bathroom to? Tom
Tom,
I'm a different Henny, not wealthy enough to afford a cabin! :) Upon closer examination of the flange it appears that they took a flange (cast metal, it appears & feels) and caulked it to the exterior of the 3"+ OD copper return tube.... kind of a Jerry-Rigged arrangement, but possibly the way it has been for the whole 40 years of this houses' existence.
I was thinking about the following to remedy the situation. Above the supply tubes that run horizontal, but right next to the 3"+ pipe, I would cut off the pipe and find one of those rubber (vinyl?) adapters with the worm gear clamps to clamp onto the OD of the copper pipe and step it up to 4" PVC. I would then use one of the "slip-in" flanges for a 4" pipe that have allen head screws on the inside that expand a seal outward to create the seal between the 4" PVC and the adapter peice. My only real worry with a set-up like this is the potential for external leakage at the joint between the smaller ID of the rubber peice and the OD of the 3" copper pipe... Thought I might be able to improve the robustness of the joint if I were to be able to form some type of a bead on the OD of the copper pipe, but don't know a practical way to accomplish such a thing given my confined space. I also don't know if it is even a concern given the very low pressure that the return side of the plumbing typically sees.
Thanks for giving this your thought and Best Regards!!