I am installing a sewage ejector pump w/tank in basement slab to handle powder rm (toilet and sink,bar sink too) There is an existing vent from the basement all the way up through the roof 1 1/2 inch abs with nothing on it. Can this pipe vent the tank and the bathroom and bar sink or does it have to be 2 inch?
Thanks Lou C
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Replies
You actually have to consider what you are venting with the 1 1/2" pipe. If you mean will the vent work for the sewage ejector, the answer is yes. But you also have to be concerned about providing normal venting for the plumbing runs themselves, just as you would if they were dumping in to a normal sewer line.
If the fixtures aren't vented properly they won't work right no matter how you get rid of the sewage.
So you are talking about two different problems.
I don't know about your local codes, but you could use the 1 1/2" vent on the ejector pump crock where we build.
I have a sewer ejector for my shop and the vent is 2". Makes sense because the outlet is also 2". If you are going to use the 1-1/2" I would talk to the manufacturer first. I bet they say no.
The fixtures that drain into the ejector are vented separately.
"The fixtures that drain into the ejector are vented separately."They may be vented separately, but the ejector vent needs to be sized for them.When you flush a toilet you will will have a slug of "water" coming into the tank. And you need to be able to vent OUT that same volumen of air..
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
Maybe, I dunno. My ejector has a 3" inlet and a 2" vent outlet along with a 2" pressure outlet. I would think that the vent outlet size has a lot more to do with the rate at which material leaves the tank while the pump is running. Mine pumps the tank down very quickly.
Bill, you are right that the vent needs to be sized to the pump discharge and vent length, but in his case ( a simple basement bathroom with a sump discharge pump) a 1 1/2" sump vent should be more than adequate to handle that.
I would install a 2" in a new house, but if all he has is a dedicated 1 1/2", he shouldn't have a problem. It's rather common to see around here.
Anyone interested in the details can look up IPC table 916.5.1 to see how sump vents are to be sized.
We played it safe- vented the tank with 2 inch seperate from the bath vent line. Why do all the concrete work and then have a problem with the discharge?
-Lou
jersey is IRC 2006
I believe the 1 1/2" vent is ok for the pit as well as a bath group.
I am not looking at the book and dont know it offhand since I dont do it all the time.