Broken Vent?

I am adding a sink in my laundry room next to the washing machine. In order to add a drain line, I tied into the existing vented drain for the washer beneath the subfloor with a 45, then routed the line up and over to where the new sink will sit. Looking through my plumbing book, I appear to have created a "broken vent" with the 45 degree step-up. Do I need to put a loop back to the vent, or can the 1-1/2" existing vent be shared as-is? The only problem with a vent loop is the new drain riser is on one side of a structural post and the vent is on the other, a there is a structural beam overhead. I would have to furr the wall out if I need to re-vent. Do I have any other options? Thanks.

vent

The book appears to have created a new term, because I have never heard of a "broken vent" during my 55+ years of plumbing. Without a picture of what you did or are doing it is impossible to tell for sure, but your description implies that you created an "S" trap which would be illegal and improper, in which case you do need a vent of some kind.

Re-vent

Here is a picture of the condition I am trying to describe.

a San-T or a 45? You drew a 90 degree angle tie in to the vent (that'd be a San-T) and yet you mentioned in your first post that you "tied in with a 45".

I did see 45 degree angles in your drawing where you drew teh P-trap itself. Did you use 45 degree angle turns for that? They're called 1/8th turns when they are drains. Or did you use round corners to make your p-trap?

David

Re-Vent

The 90 you are looking at is for the washer drain, not the new sink drain. I used a 45 below the 90 for the new sink drain connection. I don't have a trap for the sink drain yet, it is just a vertical stub out in the wall. I plan on putting a sanitary tee on the stub out, adding a P-trap and capping the line above, unless I need to re-vent that line. Hopefully I do not. I am attaching a revised picture.

Ok, 2 units on a laundry vent: sink + washing machine. No need to add more venting AS FAR AS I know. I am not a plumber. I looked into this when I rebuilt my condo. Codes vary.

If I have understood you, you are asking whether you can put BOTH a laundry basin and a washing machine on the same vent. Is that the question?

The way you connected the sink (with a Wye) is not something I can comment on. I think it is OK.

What does "broken" mean to you?

david

The broken vent is an ilegal S trap with an ilegal Wet vent over it.

You could use a fixture cross and one vent, or vent it this way.

Barometric Vent?

Ok, I think I am starting to get it. I understand the S trap and the wet vent situation. To remedy this, can I use a barometric closed loop vent for my sink? I know it is not the best senario, but I cannot get around a post to revent without furring out the entire wall to go around.

Another potential problem, can the 1-1/2" existing vent handle the washer and a sink. My plumbing book says that a 1-1/2" vent can only service 3 Fixture Units, and a washer alone is 3 fixture units.

I have attached a pic of the proposed "barometric" vent.

Thanks for your help!