SS making a U-turn?

[Nathon]

Here's another issue I've run into. To get the new sanitary sewer line to connect to the existing line, I have to make a U-turn. That is, two 45 degree turns.

Is that how it is done, or is there a better way?

Thank you!

 

[PEDARRIN2]

Cannot see the attachment.

Maybe use a pdf.

 

[Nathon]

Try the attached...

 

[PEDARRIN2]

Not totally unusual - but your turn is too sharp. It will slow down the flow and solids will come out of suspension.

Move the horizontal (part just upstream of cleanout) down the sheet, move the cleanout out to the left of the pipe.

Also, do not show the horizontal sanitary under the exterior wall. This will likely have structural implications since these walls tend to support buildings. Depending on how the structural is designed, you might not be able to bring your drains back into the wall. If you can, I would recommend bringing the drains from your lavatories into the vent pipe of the water closet (known as a vertical wet vent).

 

[Nathon]

Thank you for your help, Pedarrin2!

 

[dbill74]

First, the water closet does not appear to be properly vented.
Yes I see where the Lav could be used to vent it, problem is you are relying on the existing 6" to be a "combination waste and vent" and there is insufficient information to know that it is sized to do that job.
Going straight down with the lav waste is going to be problematic for the same reason as Pedarrin mentions for not running SS along and under the outside wall. There will more than likely be a foundation under the exterior wall. As a result it will have to be offset and if you tie in to vent the water closet, you're awful close to have a horizontal vent below the flood rim which is a no-no in plumbing codes.

 

[PEDARRIN2]

You cannot connect water closets to a combination drain and vent system.

You can use either of the wet venting provisions of 909 of the IPC (if the IPC governs).

You could bring the drain from the most upstream water closet to the interior wall to the left and vent it from there. From IPC 909.1, the other fixtures in the two toilet room groups could use this vent as the dry vent connection for a wet vent.

Just some options.