I would like to move my washer and dryer from one side of the basement to another. However, for me to run a drain line from my slop sink to the current drain pipe, it needs to run apx 60 feet along an outside wall. There is no direct route to the drain, unless I run it through the rafters. I am using 1-1/2" PVC pipe for the drain.

My questions are as follows - what is the minimum slope I would need to allow for the drain to properly flow? Is there an inexpensive alternative to a grinder pump to increase the flow? Any help is greatly appreciated.

Hi Coach,
Why ask for trouble? Increase your pipe size to 2". 1/8" to the foot is the minimum slope. At 60 feet that works out to 7 1/2" of fall. You do realize that you're going to have to vent your washer don't you? Come off the 2" drain with a short sweep elbo. Then a 2" sanitary tee,"P" trap and a 36" stand pipe. The vent will come out of the tee and will revent back into a dry vent or run out the roof. To install a grinder pump system you will need a to sink a holding tank under the cement with yet more vents.
Still want to move your washer? Cheers Tom

Tom,

Thanks for the help. I will increase to a 2" pipe. Since this is a one off fixture, would it be problematic to use an AAV instead of setting up lengthy venting. On top of the distance to the main stack, I would need to go through a cinderblock load-bearing wall, which I would prefer not to do.

Thanks again,

Coach

Good morning Coach,

Yes, a AAV would be a acceptable substitute for a roof vent. Install it on the top of a 48" raiser from the top of the tee. This will raise the vent above any chance of water escaping if there's a back up. Good luck, tom