View Full Version : 90 degree bend in sewer drain pipe?

09-12-2005, 07:32 PM
Hopefully someone can help me with this question. What I did was just move the drain pipe over 12" from the original layout and add a drain for the laundry room. The question is can I do this with a 90 degree bend in the corners? The back corner against the wall matches the original layout with a 90 degree corner. The front was at 45 degree, but with moving it over I put in a 90 degree corner. I read in the Minnesota plumbing codes that a change of direction has to be a 45 degree bend.
Will this pass inspection at the 2 90 degree turns?

Thanks in advance.


Dunbar Plumbing
09-12-2005, 08:03 PM
Probably not, in my area you would at a minimum use a street 45 and a regular 45 to make a combined 90 degree turn. I would change it to 45's and finish up.

09-12-2005, 08:26 PM
Here, a long sweep 90 is approved, it does not have to be 45's, but we would have to have a cleanout somewhere between the two 90's. It is hard to tell whether you have standard 1/4 bends, (90's), or long sweep ones. But in any case, I would have tried to simplify the installation so it would be more of a straight line.

09-12-2005, 10:53 PM
It looks like the shower is not vented.

09-13-2005, 10:26 AM
Thanks for for replies. Here is a little more detail. The green shows what the builder put in in 1995. It must have passed inspection then right?
I moved it to give me more room in the bathroom, and to add a drain in the laundry room.
the second one shows it with two 45 degree bends on the lower edge. Will this be better, or do I neeed to put two 45 degree bends on the top also?

09-13-2005, 10:50 AM
The Green shows a toilet with a laundry tray wet vented over it.

The additions show plumbing that would not pass inspections.
The floor drain should have it's own vent.
The reason for the vents, is to prevent the traps from siphoning when other plumbing is used.
For that matter, it also prevents siphoning when "they" are used also.

The reason you "don't" want the traps to siphon, is the smell you get in your home.

09-13-2005, 11:58 AM
The pipe leading to the floor drain is a 2" pipe. Can I vent this to a 1 1/2" pipe?
With the drain being vented, does everything else look ok? 90 degree corners?



09-13-2005, 01:32 PM
The 2" floor drain, sink and laundry tray can be vented with a 1.5" vent.
The toilet should have a 2" vent.
Vents can be tied together at 42" above the floor.

You should have, as hj mentioned, a cleanout for the 3" line.
Every 135% of change after the vent should have a cleanout.

That's why as plumbers, we work like the dickens to keep all directional changes to a minimum.

09-14-2005, 07:23 PM
Minnesota does allow that a floor drain need not be individually vented as long as it connects to a vented main/branch within 25'.

09-18-2005, 07:58 PM
Minn needs to update their code , that,s stupid!

Dunbar Plumbing
09-18-2005, 08:00 PM
In my area, first floor drain doesn't have to be vented but a second one does within 10 feet of the opening.