I have a question about venting and discharge for a basement sink.
Could I connect into the 1 1/2 Drain from the sink above for the discharge (in the picture below)?
The 4" stack is behind drywall so I am trying to avoid tearing into that if possible. (Also I would add check valve and unions, just didn't take time to draw them).
A 1.5 inch drain under IPC can handle 3 DFU. Your KS is 2 DFU. Your pump is 2 DFU times the GPM of the pump at a 10 foot head. I'm sure it far exceeds the 1 DFU you have remaining on you 1.5 inch drain. Run the pump to the 4 inch or extend with an MIP on the cleanout to add a 4 inch wye for the pump.
Sanitary drains are designed for gravity drainage not pump discharges.
Not to mention but when your kitchen drain blocks your going to have one heck of a mess.
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