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-   -   Do I need seperate vent stacks for basement pump and basement sink? (http://www.diychatroom.com/f7/do-i-need-seperate-vent-stacks-basement-pump-basement-sink-88983/)

twinfins 12-07-2010 01:41 PM

Do I need seperate vent stacks for basement pump and basement sink?
 
I am working on drawings for my basement remodel and have a question about venting a sink and pump.

I plan to use a drain pump (something like the Liberty 405) to pump water up to the main drain line of the house which is about 6' above where the sink drain level will be. I still have some homework to do on this as far as calculating if the drain can handle the pump output etc...

My question is about venting the pump and the sink. I understand I need to vent the pump to the roof. Do I also need to vent the sink? I think I do since I need a P trap to keep the pump pit gasses out of the room. If this is the case can I use the same vent stack as the pump or does the pump vent need to be dedicated?

broox 12-07-2010 04:30 PM

First, let me tell you this answer is not based on any code book of any kind. I am going to tell you what has worked for me

I have a little pump tank in my basement that catches my slop sink and urinal. It pumps up to my 4" main about 8 feet. Both the inlet and outlet are on top. I have two san tees stacked in the vertical riser and a studor or air admittance valve on top. The tank vent is also on top and I reduced the vent size to a 3/8" copper tubing adapter and stuck a piece of copper tubing through my block wall. It functions perfectly. I might catch some grief for this "rigging" but it has only been like that for seven years.

the_man 12-07-2010 08:08 PM

studor vents do not work on pump basins. air has to be able to leave the basin as it fills with water, and aav's only let air in. all fixtures need a vent, including the ones plumbed into a sewage ejector, but you don't have to run them separately out of the roof.

broox 12-07-2010 08:54 PM

My pump tank has a vent, but my fixtures don't. It works fine

the_man 12-07-2010 10:40 PM

Quote:

Originally Posted by broox (Post 547665)
My pump tank has a vent, but my fixtures don't. It works fine

doesn't mean its right. not to be rude, but this isn't diyhackroom.com people come here for advice from professionals, not "it works good for me"

broox 12-07-2010 11:28 PM

I am going to bed, maybe I will feel more argumentative tomorrow.


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