How to plumb sink after washer drain?

[Nick Evans]

I have a washer/dryer next to a sink hookup, but we want to move things to the adjacent wall.
Here is a picture of the current setup.

The sink is currently connected to the stack at a T above the T that connects the washer drain pipe.
I have to go ~30" from the stack to an elbow, then another ~80" to where I want the sink (it will be beneath a window).
I'm trying to figure out how I can plumb this setup correctly.
Is it best to use two unique T's like this setup (Grey line is supposed to be a P trap for the washing machine).
In this setup, it keeps the 2 lines separate like they are now, I just wonder if there's a better way to go about this.

I wasn't sure if there was some better setup - similar to this or something. (though in their setup, the washer drain is after the sink - the reverse of what I'm after).

 

[Terry]

Each trap needs it's own vent. There is no wet venting with kitchen sinks, laundry sinks and washers.

 

[Sponsor]

 

[hj]

Your secpmd photo, with revisions, is the way to do it. In your first picture, BOTH drains are too long to be installed without secondary vents.

 

[Nick Evans]

Thanks for the feedback guys.
I went and read up more on venting and wet venting.
If I understand correctly - the way they plumbed things originally (picture #1 in my first post) they wet vented the washer drain, which per @Terry is bad.

So based on the feedback, and what I read in those links above, here's my new proposal.

The article listed above said vents cannot be further than 5' from the drain, so I denoted that on my diagram.
It also says "the vent can not have bends in excess of 135 degrees" which makes me curious - my secondary vents in this diagram have 90 degree elbows... is that going to be a problem?

 

[hj]

WHO drew up THAT design? Besides being overly complicated, it is almost completely wrong. The "washer vent" is absolutely useless at that location and the washer drain is not vented. The washer's vent can be 5' from the trap ONLY if there is no other drain connected to it.

 

[Nick Evans]

WHO drew up THAT design? .

I drew it - good thing I posted it to find out it's badly done.

The washer's vent can be 5' from the trap ONLY if there is no other drain connected to it.

So since there are 2 drains on this line, what does the vent distance change to? 2'? Directly above the drain (don't know what the term is for that).

Can you give me some details as to why it's too complicated or doesn't work?
You said the original picture I posted of someone elses setup was good but needed modifications. I want the reverse of what they have - the sink further than the washer drain, so I'm not totally clear how I would adapt that.

Everything I'm finding in my searches discusses how to plumb the setup if:

1. It's located on the same wall as the stack (mine is not)
2. The washer is located after the sink (I want the sink further away than the washer)

Here's another image that is kind of what I want, but again, has the 2 issues as listed above:

Terry's note on this: The washer standpipe is too short. He should have come off lower to start the trap arm for the washer. Instead of a vertical santee, he could have used a horizontal combo fitting.

I could try drawing another mock up, but, if you have any suggestions maybe I should take them into account prior to trying it again. I'm also open to links to articles that discuss my topic as well. I just haven't been able to find the details for what I'm after specifically.

 

[Nick Evans]

After looking at more examples on other sites, I'm wondering if this is a better set up:

No wet venting (I don't think), a simpler design, and I think if the vent is stacked right over the drain it's more like the examples I'm seeing around online.
Would this setup work?
If no - could you please help me understand why?

 

[hj]

yes, but the last "elbow" can be a combo if you need the sink drain lower, with the vent off the side opening.

 

[Sylvan]

NYC plumbing code stated the Trap "shall be " within 2 feet of a vented line and the trap shall be no more then 2 feet from the fixture so in another word you have 4 feet to play with not 5

 

[Roberto]

Dear Terry,

man I able to add a second vanity sink by placing a t on the vertical pipe labeled “washer drain” on the right side of the photo?

Thank you,

Roberto