There is a utility room adjacent to the new laundry closet, which is where the laundry is currently.
In order to drain, however, I need route the drain up and around the utility room doorway in order to get to the drain on the opposite side of the room. A properly pitched drain would have to cross right through the middle of the doorway.
What is that white PVC pipe in the 2nd picture? It looks like there might already be a drain line running through the wall behind the washer (in the new location) that you could tie into.
I think that's what he wants to reach. That should be a piece of cake without an extra pump.
The 4” pvc you see is the radon system, not a drain.
) but maybe you could install a laundry sink in the new closet (I know, you don't have room...) but, what if you mounted the sink to the wall up high? Like, REALLY up high, near the ceiling. Doesn't matter if you can't reach it or actually use it as a sink; it's just something for the washer to dump into. Then the washing machine only has to pump enough to reach that. Then you install a "regular" drain pump to the sink's drain, and away you go.The other possible option I considered is running a properly pitched 2” drain around the perimeter of the utility room to the main stack. The only problem would be venting. It would be about a 20’ horizontal run. Is that even legal?
I believe a 2” pipe needs to be vented every 5’. Can you use multiple AAVs on one horizontal run?
You should not need multiple vents, just one within about 5' of the trap which would be near the washer. There is a requirement on the height of that trap above the floor too, can't remember but something like 12" max above the floor with the stand pipe 30-48" high. The only purpose of a vent is to not siphon your trap empty and allow sewer gas to come back up.
There seems to be a thought that pipes need to be vented to drain. They drain fine without vents, will gurgle in the trap and then siphon it dry which is not good, so a vent is needed within so many feet of a trap depending on the pipe size. The bigger the pipe the farther away from the trap you can go.
Looks like the Sanivite will do the job. https://www.saniflo.com/us/installing-an-additional-bathroom/96-sanivite.html Check out the install instructions shows a direct connection from washer to pump. No sink.
