Utility Tub and Washer on same drain?

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I just moved into my house, built in 1967 and I am trying to replace the existing Laundry/Utility Tub and want to know how to best drain it.
I want to do my best to fix the bad situation that I have, as easily as possible.

I want to install a new laundry tub with a new P trap, as well as a new washer stand pipe so I dont have to drain the washer directly into the sink.
I will not be finishing these walls.

In the picture of the current set-up, the vertical drain pipe runs upstairs directly to the kitchen double sink. There is no vents anywhere that I can see. There is a cutoff vertical copper pipe on the left that is taped. Not sure what this was used for.

Also of note, the vertical drain is only 1.5 inch copper into the ground. I understand that 2" is code now, but I won't be able to get into the concrete to fix that so I am stuck with 1.5 in.

The 2nd picture is my proposed drain design. I'm going to get rid of the copper and go all 1.5in PVC. I want to add a studor vent but I'm really not exactly sure the best way to go about doing this. Is my design feasible? Or is there a fatal flaw? I expect that the tub may fill up when the washer is draining. I am OK with that.

Let me know if I need to be more clear on anything. I've been lurking these forums for a few days but I'm not much of a plumber.

Thanks in advance.


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