AAV for sewage pump

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by justincay, Aug 10, 2010.

  1. justincay

    justincay New Member

    Messages:
    1
    Location:
    SE Kansas
    We are finishing out a basement below a double wide that has a roughed-in bath (not our rough-in). There was no allowance for venting any of the bath fixtures, wasn't even a trap run under tub drain rough-in. Is there an AAV available that would vent the sewage pump? Would have to do major destruction upstairs to make access for roof venting. Dug out enough sand to get the tub trap in but am at at a stand-still till venting issue is fixed. Help! Tks, justin
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,124
    Location:
    Bothell, Washington
    Sewage ejectors don't work with AAV's
    It needs a 2" vent run through the roof, even if it's attached to the outside of the structure.

    Even in a normal situation, an AAV always needs a primary vent in the system vented through the roof.
  3. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Well now hang on a minute. god I'm gonna hate myself for this but..... according to the 09 IPC you can indeed vent an ejector tank provided the system is engineered. So..... if you go to Studor's web site and do some fishing around you will find an engineered schematic for venting an ejector tank using an aav. What a world...... what a world.... :(
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,825
    Location:
    Cave Creek, Arizona
    A sewage ejector system is a "closed system", so HOW can a Studor/AAV which can only allow air IN, be expected to exhaust air that had to be displaced by the incoming water? The Studor sites says, "It can be used on ejectors, IF done in an engineered, (meaning designed and certified by a professional mechanical engineer), manner, AND approved by local codes, BUT does NOT tell how it can be done> In fact EVERY specification sheet says that there MUST be at least ONE relief vent on the system. It is possible that they mean that an AAV can be installed ON the ejector pit, IF the fixtures themselves have an atmospheric vent, which would work.
    Last edited: Aug 11, 2010
  5. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Go to their website.... all will be made clear........ well, not exactly clear but you will be enlightened none the less. ( not in a good way either )

    To simplify it though, they are using the air space at the top of the lateral to vent into. I can see how it will work but I see no reason for the aav. It would work without one also.

    I love these topics, they really stir us old timers up.
    Last edited by a moderator: Aug 11, 2010
  6. nukeman

    nukeman Nuclear Engineer

    Messages:
    711
    Location:
    VA
  7. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Thanks Nuke, ain't that a peach?

    Remember folks. I said that you can do it, not that you should.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,825
    Location:
    Cave Creek, Arizona
    Doing it that way means you do NOT even need the AAV. And it also means that if the main line is plugged up, the sewage will flow down the vent into the ejector basin where it will promply flood the area.
  9. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Yep. no argument here. Like I said, just because you can don't mean you should
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,825
    Location:
    Cave Creek, Arizona
    It is the same thing as connecting a basement bathroom's vent back into the vertical stack. And it would NEVER pass inspection by any knowledgeable inspector.
  11. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Again, and sadly, an inspector can't do much about it other than scratch his head. I actually took this issue to both the Maine and NH plumbing boards and though we were all in agreement over the stupidity of the whole thing, unless someone passes an amendment, there's nothing that can be done about it.
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