Richard ..
First, thanks so much for the illustration. Answers my question perfectly.
To respond to various items in your message:
- Re using 2" instead of 1.5" for the kitchen drain: Thanks for the update. Don't believe it'll be a problem.
- Re 6' max length from the 1.5" vent to the tub trap @ 1/4" pitch: I'm good to go, I believe. My run will be a foot or less, and my little torpedo level tells me I've got at least 1/4" pitch.
- Standing water in the trap: The trap/elbow(weir) assy I'm using will have 2", so that's up to code.
- Minimum length from the vent to the trap weir of 2x the pipe dia: That's 3" for a 1.5" pipe. I'm thinking my length will be somewhere around 8".
- Vertical rise from the trap input to the actual drain opening may not exceed 24" (not counting local code exceptions): I estimate mine to be around 20-21".
So, I think I've the right things checked off and, once again, thank you so much for your guidance.
Regards,
John