Sink drain/vent question due to abandoned piping

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Moneypitfeeder

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Hi All,
Our home's kitchen sink was improperly connected to the waste work in the basement without having a vent tied to it, (previous owner) had drilled a hole in the floor of the kitchen and ran the drain line down into the stack for the utility sink in the basement and abandoned the original plumbing (had the tell-tale sucking sound when the water ran out of the sink). We've uncovered the original piping and the run from the sink to the (down) for the waste to the basement, and the (upwards) run to the roof vent are all still solid cast iron. The problem was in the basement at the floor level the runout to the main had collapsed. Next to where the sink drain to the main was, is a cast stack that the utility tub drains into, and it has a connection to a vent (which ties into the original kitchen vent well above upstairs). Question is, we hope there is a way we should be able to tie into the utility tub stack with the kitchen drain, and since we can now have the kitchen vent in operation again that it will not only function, but be to current PA code. We are not sure if we tie into the top of the stack with the (on the first floor kitchen drain that is vented to the roof) if the vent for the utility tub needs to extend to the p-trap side of the stack, or if it will be ok in its current position entering to the left of the stack. Here is a diagram of what we would like to know if it work. Pipe measurements are noted in the drawing. TIA, Dee
 

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Terry

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Wet venting is on the same floor and only with bathroom fixtures such as toilets, lavs, tubs and showers.

Kitchen sinks, washers and laundry trays are not allowed to be wet vented.

The vent for the laundry sink downstairs needs it's own vent before it ties into a waste line. That vent ties in at 6" above the flood level of the highest fixture, which in this case is upstairs.
Or you can use an AAV for the laundry sink venting if it's allowed where you are. In Washington State it would be allowed.

AAV = Air Admittance Valve.

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