Proper basement utility sink drain plumbing?


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Old 06-08-19, 11:35 AM
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Proper basement utility sink drain plumbing?

Hi, first time posting here. Iíve got an old washer/dryer location thatís no longer used as laundry has been relocated upstairs. Iíd like to install a utility sink in the same spot. As you can see in the picture Iíve got water supply, a standpipe at approximately 31Ē high, and a nearby floor drain. Iím hoping to find out what the best way to plumb this would be.

Can I drain the utility sink into the standpipe? The standpipe is not used for anything at all currently.

 
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Old 06-08-19, 11:56 AM
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There is likely a trap for the standpipe that is buried in the floor. So if you hook a sink up to it you would not want to have a second trap. Best scenario imo would be to break concrete and get rid of the inaccessible trap... and run a vented line up the wall behind the sink. Then use a sj trap that goes straight back into a sanitary tee. Top part of the tee goes to your closest branch vent.
 
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Old 06-09-19, 09:24 AM
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Thanks, XSleeper. Technically I could run a drain line into the nearby floor drain, correct?
 
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Old 06-10-19, 07:53 AM
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Technically I could run a drain line into the nearby floor drain
Not necessarily. Floor drains are often plumbed separately and aren't supposed to take gray water.

There is likely a trap for the standpipe that is buried in the floor
I'd look down into that pipe with a flashlight and see if you can see water (in a trap). It might be hard with that long a standpipe, but using that drain is your best bet if you can get it to work.

If there is a trap down there... you may consider just draining the sink tailpiece into that pipe. No seal. It's not the way it should be plumbed, but it would work just like the washer plumbing.
 
 

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