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Tying basement sewage pump into main drain

Tying basement sewage pump into main drain

Hello, I have a roughed in bathroom in my basement and I'm now planning to finish up the plumbing. I'm stuck on how to tie in the 2" sewage discharge pipe from the pump into my 3" main drain. From what I read I need to place a 3"x3"x2" wye into the existing drain pipe somewhere and the discharge pipe needs to come into it from above. "Possible tie-in spot 1" would be best but there is no play in that spot at all and only maybe 2ft of available to work with on that 3 inch pipe. How do I get the wye in there? A compression fitting of some type? A Fernco? A slip fix coupling? Something else? This is going to be enclosed in a wall so I'd like something reliable. I'm in New Hampshire btw. Also, I have this 3" pipe coming out of the concrete, it's in the photos and diagram. It is connected with all the other underground plumbing that goes into the sewage pump pit but I can't figure out what it's for. If anyone knows I'd love to hear what it might be for. Thanks upfront for any advice!

Re: Tying basement sewage pump into main drain

add a full size y downstream of the existing 'stuff' looking up 45+ degrees loop the pump discharge up and into said y put the 'increaser' close to the tie in good job nice venting

Re: Tying basement sewage pump into main drain

the 2 inch unknown rough-in is probably a shower drain. pour some water down it to see if there is a trap at the bottom. if water stays it has a trap if water does not stay then it is a mystery

Re: Tying basement sewage pump into main drain

You need a check valve below the ball valve on the discharge line

Re: Tying basement sewage pump into main drain

Ah thank you, I will add one!

Re: Tying basement sewage pump into main drain

seems like this is journeyman level work. if the plan is to bury this plumbing might want to get a qualified journeyman level plumber. Level 5 apprentice at least! lol good luck and post photos of your work and prove me wrong.

Re: Tying basement sewage pump into main drain

Thanks for the suggestion! This pipe is actually 3 inches and looks like there is no trap, I poured a little bit of water and it all made its way to the pump pit. So I guess still a mystery. Maybe drain for a washing machine?

Re: Tying basement sewage pump into main drain

Thanks for replying, is this what you meant? I used two 45s to make the curves gentler because I dont have sweep 90s in my software. I think I saw a recommendation to use sweeps in cases like this. I don't know what you meant by "increaser" though... I still don't know how to get that wye in there though because there is no flex in that pipe. Any ideas? Thanks.

Re: Tying basement sewage pump into main drain

Thank you for the warning! I appreciate the honest advice. Does your warning pertain specifically to the sewer pipe drainage or all of it, all the red piping? My plan was to give this a try and see if I can pass inspection but it sounds like that's unlikely?

Re: Tying basement sewage pump into main drain

If there's no side to side movement available after cutting the pipe, you will need 2 shielded couplings to connect the wye. You would glue a short section of pipe into each end of the wye to couple to.

Re: Tying basement sewage pump into main drain

yes, you have the concept use 'sweeps' if possible - the Y can be 'rolled' from vertical to 45 degrees above horizontal if necessary you need to keep the pump discharge pipe size the same until you 'enter' the main line this may be done with either a reducing Y or a reducing/increasing coupling juuuust before the tie in

Re: Tying basement sewage pump into main drain

The extra pipe may be a vent for the future basement bathroom I would tie it in as avent

Re: Tying basement sewage pump into main drain

As far as using shielded couplings to connect the wye, is it ok to put shielded couplings inside of a finished drywalled wall? Would shielded couplings be better than the Slide Repair Couplings like these?

Re: Tying basement sewage pump into main drain

code compliant shielded couplings are far far far superior to 'repair parts' which depend on a simple 'o' ring for a seal shielded coupling were INVENTED to assemble CI 'nohub' drain pipe

Re: Tying basement sewage pump into main drain

Hey everyone, I'm finally hooking up my basement sewage pump with actual plumbing to the 3" drainage main. I know I'm missing a check valve but is there anything else that doesn't look right? This is all dry fit to show where things will go. Thanks.