Relocating toilet drain... Will this work?

[dortoh]

I need to relocate the the first floor portion of the existing drain/vent that runs from my crawl space to the roof. Below is a drawing of what I need to do, and pics of the existing plumbing. Everything in the bathroom works fine now and I want it to stay that way.

Will this work? Is there a better/easier way?

View of drain teeing into existing stack just below second floor.

View of pipe leading to tee shown above.

View of wye / tee just after toilet (see diagram).

View of toilet to wye / tee (see diagram).

View of 2" drains to wye / tee.

View of drain / vent stack.

 

[phishfood]

Does the 3" pipe that you want to move receive the drains from other fixtures on an upper floor? If not, what you wish to do creates a dry flat vent, which is prohibited by any code that I am aware of.

Does one of the 2" drain lines attached to the 3" toilet line serve as a vent for the toilet?

 

[dortoh]

Does the 3" pipe that you want to move receive the drains from other fixtures on an upper floor? If not, what you wish to do creates a dry flat vent, which is prohibited by any code that I am aware of.

Does one of the 2" drain lines attached to the 3" toilet line serve as a vent for the toilet?

The 3" pipe receives the drains from all the fixtures in the master bath.

Since I can't see the complete run for the 2" pipes I have to go with an educated guess that they are the drains from the other fixtures (I here water running through them when the spigots are open). The toilet appears to vent via the main stack.

What constitutes a dry flat vent?

Thanks,
Jeff

 

[Mr_David]

Question: Could the 2" into Wye just after the Toilet be a Vent for the Toilet?
What other fixtures if any come down this line. It's hard to believe the 3" stack is the vent for the toilet.
What is the 2" coming down and to the left in the last picture. Is it going to the Wye at toilet?
If so I would guess that it is a vent.

Code requires the vent connected to a horizontal drain line be above the center line of the pipe downstream of trap being served.

Also Unless prohibited by structural-conditions each shall rise to at least 6" vertically above the flood rim of the fixture before offsetting horizontally.
Other than any vent issue rerouting the drain should be fine from what I see in the pictures and your drawing.
NICE Drawing