I have the current setup in the basement, as shown in the photos below. I would like to see if any wisdom can be shared here to add a proper drain for the washer, i.e., a 18" standpipe with a p-trap that stands at most 18" above the ground.
Right now, the clean out plug is on the right side of the double wye, placed just on top of the main drain. There's no way to add anything below the double wye down the main drain pipe.
I'm completely new to plumbing. I have a perhaps-crazy thought on
- extend from the wye on the right at 45 degree, add a MPT x Hub
- still at 45 degree, add a tee with the side inlet facing the wall
- at the end of the 3" Hub, add back the screwable plug
- from the side inlet, make a 90" turn with an elbow so that a horizontal pipe can go to the right. With this particular fitting, the 2" inlet can point up
- the horizontal pipe will be reduced to 2", and be finally connected with a ptrap and standpipe.
- the 2" inlet will go up, then to the left, going behind the vertical drain, and finally connect to the vent pipe on the left, above its current clean out.
I tried to visualize the above but I failed to draw it in 3D. So I hope people can understand what I said over there. May be it's crazy, violating some code. Please feel free to point out anything that might be wrong. A new/better plan is welcomed too.