Connecting Washing Machine Branch to Existing Drain Cleanout in Basement

[tustind]

Hi all,

I have a 3 family building and there are existing hookups for washers and dryers in the basement for each unit. However the currently drain into the sump -- which goes out the window! They are not in use for this reason.

I want to drain the machines properly, but due to their location there is no way to get them into the main sewer stack that comes down in the middle of the building without a pump.

However, there is a final main cleanout that comes up above the concrete floor just before the main exits the building and goes to the street.

I would like to drain the machines into the cleanout by installing a male adapter with a Y to replace the cleanout.

I have a couple questions for which I would appreciate some advice:

1.) Can I do this? (I care less about the plumbing code and more about whether it will work)

2.) How should I vent the machines? Could I vent with an AAV on a loop above the drain line? (See attached diagram)

3.) Can I use a PVC male adapter to thread into the existing cast-iron clean out? Or is there a better way to do this that doesn't involve jack hammering up the floor?

Thank you!
Dustin

 

[Stuff]

Plan should work. Don't reduce the pipe size until above the Y to retain a full size clean-out (or use a clean-out T). Some areas don't allow AAVs as they do fail and 3 washers would accelerate that.

You may not care but multi-unit homes have stricter codes to protect everyone's health. Present your drawing to the local plumbing inspector for their sign-off.

 

[Sponsor]

 

[tustind]

Plan should work. Don't reduce the pipe size until above the Y to retain a full size clean-out (or use a clean-out T). Some areas don't allow AAVs as they do fail and 3 washers would accelerate that.

You may not care but multi-unit homes have stricter codes to protect everyone's health. Present your drawing to the local plumbing inspector for their sign-off.

Thanks for the feedback, much appreciated!

 

[Stuff]

I looked for a good diagram for multiple standpipes but haven't found one. Note that the 2nd and 3rd should be vented before connecting to the drain. Closest I could find was this one showing how the two traps on the right are connected. https://terrylove.com/forums/index.php?attachments/proposed-plumbing2-jpg.6916/

 

[tustind]

After removing the clean out cap, which was barely attached, there were almost no threads left on the clean out. So instead of a male adapter with a wye, I put on a 3" x 2" flexible coupling. My thinking is I can leave out the wye with cleanout entirely since this can easily be removed if necessary. Is there any reason to do it the other way (attach a new cleanout on a wye) instead of doing it like this?

 

[Stuff]

If the pipe above is connected to other pipes and fastened in place it will not be easily removed.