Can a Sanitary Tee be used to tie Vertical to Horizontal if it is only used for a Vent?

[tonyttt]

Hello, I have two horizontal drain sections one is three inch and has two sinks connected, the other is 4" and has one sink, one WC and a tub. Each has a vent tied in coming from the roof. Because of the placement, I cant fit a Wye fitting to tie the vent in to each of the horizontal sections. I know I cant use a Santee to transition from vertical to horizontal but is that restriction limited to waste flow making permissible if the transition is for the vent only?
Thanks!!

 

[Stuff]

Probably. Can you post a picture or drawing?

 

[Sponsor]

 

[Reach4]

There are differing opinions on whether a santee can be used to vent a horizontal drain pipe with a dry vent. I don't find clear code cites either way. I find people saying that it depends on the inspector.

Plumbing-and-Trenching-for-Homeowners---2018 (klickitatcounty.org) page 5 item D shows that as an example.

http://www.co.lincoln.or.us/sites/d..._-_helpful_hints_residential_construction.pdf page 8 says

Drain pipe from sink, tub, toilet or shower is not permitted to drain into a san tee in a horizontal position.​

The wording to me implies that the vertical could be a dry vent.

 

[tonyttt]

Probably. Can you post a picture or drawing?

Hello,
Thanks for the reply, Here is a picture of the 4" vent connection. If its contrary to code I would change before the inspection.

 

[tonyttt]

There are differing opinions on whether a santee can be used to vent a horizontal drain pipe with a dry vent. I don't find clear code cites either way. I find people saying that it depends on the inspector.

Plumbing-and-Trenching-for-Homeowners---2018 (klickitatcounty.org) page 5 item D shows that as an example.

http://www.co.lincoln.or.us/sites/d..._-_helpful_hints_residential_construction.pdf page 8 says

Drain pipe from sink, tub, toilet or shower is not permitted to drain into a san tee in a horizontal position.​

The wording to me implies that the vertical could be a dry vent.

Thanks, those docs are very helpful!