Ejector pump line and connection

[jplausible]

Hello everyone. I'm fixing a drainage issue with my ejector pump and not sure about the best way to connect it to my vertical sewage stack. It's a 2" line that comes up from the basement and goes horizontal for 22ft to meet the 3" vertical waste stack. Should this connection be a santee or a combo/wye? I didn't know if the combo is going to cause gargle noise from the pipe as it tries to finish emptying the horizontal pipe after each cycle even though it provides better flow. I'm also wondering if I need to upsize the 3 inch to 4 inch. The house currently has 2.5 baths plus laundry/sink on the ejector pump but I would like to put a bathroom in the basement after fixing this issue. The ejector pump is currently connected to the 2 inch kitchen sink drain and causes the water to come back up the kitchen sink drain when it cycles but it drains back down immediately. Thank you for any help on me over thinking this.

 

[Jeff H Young]

code requires a wye type fitting so forget about a san tee . pump must not connect to a 2 inch drain connect to a 3 inch minimum if you have opportunity Id connect to 4 inch 2.5 bath going to add one so thats 4 toilets on gravity My code has made changes and the old code would require 4 inch So Id respect that old code if it was available but 3 inch is probebly fine forget 2 inch absolutely wrong on the gravity side

 

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[jplausible]

code requires a wye type fitting so forget about a san tee . pump must not connect to a 2 inch drain connect to a 3 inch minimum if you have opportunity Id connect to 4 inch 2.5 bath going to add one so thats 4 toilets on gravity My code has made changes and the old code would require 4 inch So Id respect that old code if it was available but 3 inch is probebly fine forget 2 inch absolutely wrong on the gravity side

So I added a beautiful doodle of my project as I wanted to make sure I was being more clear. Sorry I don't have a computer right now so I did it all on my phone. The horizontal 22ft 2" pipe is going to be only the ejector pipe. It's than going to meet the 3" vertical stack. I'm redoing all of this because the ejector pump used to tie into the 2" line for the kitchen sink. Luckily it's only used for an old unused laundry set and sink but it does actually backfeed up as high as the kitchen sink trap. Originally I thought it was just sucking the trap dry but investigating it led me to this. I want to feed its own dedicated line to the vertical stack but I'm not sure how much 3" pipe needs to be changed to 4". Everything is 3" currently except the last 2ft going into the basement wall is 4". The biggest concern I have is the ejector pump connection. It's a long unvented horizontal run and I don't want to throw in a wye and find out there's a horribly loud and long glupping sound as the pipe empties after the ejector pump shuts off. I thought maybe a santee would help the line vent properly as it empties the residual water. I may be overthrowing it but I have scoured the books with not much information. Thank you for your help.

 

[Jeff H Young]

pumped line should always go through wye branch fitting . Not 100 percent but my understanding is connect to 4 inch If you follow the proper methods there shouldnt be problems but if you dont then you take a chance