Jlong Posted March 26, 2020 Report Share Posted March 26, 2020 I’m rerouting plumbing from upstairs and will have isolated 6 foot horizontal run of septic lift liquid. Currently feeds into 4 inch line that has upstream feed from frequently used fixtures. Question is do I maintain 4 inch line or can I run 2 inch for that segment. Basement used few times a year. Link to comment Share on other sites More sharing options...
Jim Katen Posted March 27, 2020 Report Share Posted March 27, 2020 1 hour ago, Jlong said: I’m rerouting plumbing from upstairs and will have isolated 6 foot horizontal run of septic lift liquid. Currently feeds into 4 inch line that has upstream feed from frequently used fixtures. Question is do I maintain 4 inch line or can I run 2 inch for that segment. Basement used few times a year. What fixtures will use this section of drainpipe? Link to comment Share on other sites More sharing options...
Jlong Posted March 27, 2020 Author Report Share Posted March 27, 2020 Kitchen sink, shower, bathroom sink, toilet. Hardly ever used. Thx for quick reply. Link to comment Share on other sites More sharing options...
hausdok Posted March 27, 2020 Report Share Posted March 27, 2020 Hi, I'm not a plumber, but I've seen a lot of these setups where basements have been remodeled with a new basement bath. Typically a two-inch line runs from the lift pump up to the underside of the floor joists above (or through them if ceiling height is an issue) and then down into the topside of the main. Make sure that you vent the setup properly according to your local code. Do that and you'll probably be fine. ONE TEAM - ONE FIGHT!!! Mike Link to comment Share on other sites More sharing options...
Jim Katen Posted March 27, 2020 Report Share Posted March 27, 2020 The plumbing code leaves this pipe size up to the pump manufacturer. Given that you're only dealing with 8 fixture units, I can't imagine that the pump manufacturer would require anything larger than 2". If you're doing this under a permit, get the pump model number and ask the manufacturer to give you a discharge pipe size for the local inspector. Be sure to join the 4" pipe from the top, like Mike said. Link to comment Share on other sites More sharing options...
Ben Davis Posted November 19, 2020 Report Share Posted November 19, 2020 The plumbing code leaves this pipe size up to the pump manufacturer. Given that you're only dealing with 8 fixture units, I can't imagine that the pump manufacturer would require anything larger than 2". If you're doing this under a permit, get the pump model number and ask the manufacturer to give you a discharge pipe size for the local inspector. Be sure to join the 4" pipe from the top, like Mike said. And when you connect to the pipe from above, see that there is no twisting Link to comment Share on other sites More sharing options...
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