drain pipe size and venting sink
My kitchen sink drain runs from one side of the house to the other where it connects to the base of the stack vent. The total distance is about thirty feet.
I have two questions:
1. Is the current 1.5" pvc pipe large enough or should I replace it with a two inch pipe? It drains a double sink with garbage disposal.
2. The only vent it has is basically a loose drain connection from a washing machine that was once installed (rigged) in the kitchen for the previous owners, if you want to call that a vent.
I'm going to replace the pipe. Over that 30 feet, does it matter where I tie in a vent assuming it needs a vent. I want to vent it as close to the stack as possible.
Hope that makes sense.