How to seal unused drain pipe? Answered
The short version:
I have an old PVC sewer drain pipe that comes up out of a concrete slab floor. Under the floor, the other end of the pipe connects to other drain pipes in the house, so before I cover the area with more carpeting, I'd like to seal that pipe off permanently to avoid any possible leakage in the future. I'd like to avoid disturbing the concrete floor, if possible. I'd like to put some kind of plug in the pipe and glue it into place with common PVC primer and cement, but I don't know if there's any kind of plug made for this purpose.
I've taken down a non-load-bearing wall in my house. The wall used to carry pipes for water (coming down from the second floor above), natural gas (embedded in the concrete slab floor), and sewer (also embedded in the slab). These were all used for a poorly-positioned laundry room. I've easily sealed the copper pipes for the water and natural gas, but I'm left wondering what to do with this two-inch sewer drain pipe.
At first, I thought of covering it with a PVC cap, but to do that, I would need to chip away part of the concrete floor far enough down so the cap wouldn't be above the floor surface. I would also need to be careful not to break the pipe as I chipped away the concrete. If I were successful with that and then glued a cap on at the right height, then I would need to fill the space around it with a small amount of concrete. Besides not wanting to damage the pipe, I'm sure I'd make a real mess of the carpet nearby.
Then, I thought, rather than gluing a cap over the *outside* of the pipe, maybe there's some kind of cap that I can glue on the *inside* of it istead. However, I don't know of any such pipe fitting. It seems that all the home improvement stores around here sell fittings that go on the outside of the pipe. So I'm looking for creative ways to plug up the end of this pipe.
The other end of this pipe connects to other sewer pipes in the house that are currently in use. I thought of possibly pouring a cement-like substance into the pipe to seal it, but I can't guarantee that it wouldn't go into the rest of the system and cause a disastrous plug for the whole thing.
PS: Excuse the orientation of the photos I've attached to this posting. They looked fine on my phone, but when I upload them to Instructables, the site insists on rotating them.
PPS: I do plan to cut the PVC pipe off even with the floor just before sealing it. I'll use my trusty Dremel Multi-Max for that.