I want to install a utility sink in my basement laundry. Can I hook the drain into the Stand Pipe for the washer? Or, do I have to hook it into one of the other main waste stacks that drop from the main floor above?

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Originally Posted by tmas926

I want to install a utility sink in my basement laundry. Can I hook the drain into the Stand Pipe for the washer? Or, do I have to hook it into one of the other main waste stacks that drop from the main floor above?

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I don't think you're going to like what I have to say. Ya can't hook it up either way and not run into code violations. You may not discharge a major fixture such as a toilet or a bathroom group past a unvented minor one such as your laundry tray. So that eliminates simply hooking it into a existing waste stack.
And you can not double trap a fixture so if you trapped the sink, you would also have a trap in the washer stand pipe. But even if you elbowed over, without a trap on the sink you would have to tie in so low that I'm afraid that when the washer discharged that you would get water back up in the sink.
So how can you hook up your laundry tray and drain and vent it by code?
The drainage hookup will go like this. If a 4" stack, cut in a 4 X2" DWV Drainage tee into the waste stack of your choice about 11 " off the floor to center of the branch of the tee. Come off the branch of that tee with a piece of 2" to the spot you want the sink and 2" short sweep elbo and put a 2"X 2 X 1 1/2" DWV drainage tee on top of it facing out at 16" off the floor to center of the branch.. Stub out 1 1/2" and that is what your "P" trap will hook into. The open part of the tee will run up and over and revent back in to the existing washer vent. You must use the washer vent for a revent as that sounds like the only vent that isn't taking the discharge from another fixture. Now you're legal. Good luck, Tom

Speed ball,
Can he connect the new laundry basin where the washer is and then drain the washer into the basin??

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Originally Posted by tommytman

Speed ball,
Can he connect the new laundry basin where the washer is and then drain the washer into the basin????

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Tommy,
That he could do. He would have one hellava long tailpiece dropping from the sink drain to the trap and the trap might have to repositioned but yes, if he used the washer standpipe for a tailpiece out of the laundry tray drain and tee'd off the water over to pick up the sink it would be vented and in code.
If he wished he could move the trap,( and the sink) 3 1/2' away from the vent if the trap were 1 1/2" or 5' if it were 2".
Thanks for coming up with another, (and easier) solution.