(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 11 of 11

Thread: AAV for sewage pump

  1. #1
    DIY Junior Member justincay's Avatar
    Join Date
    Aug 2010
    Location
    SE Kansas
    Posts
    1

    Default AAV for sewage pump

    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. #2
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    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. #3
    In the Trades Wally Hays's Avatar
    Join Date
    Nov 2009
    Location
    New England
    Posts
    652

    Default

    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....
    Perception is 3/4 of reality

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,638

    Default

    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 by hj; 08-11-2010 at 06:27 AM.

  5. #5
    In the Trades Wally Hays's Avatar
    Join Date
    Nov 2009
    Location
    New England
    Posts
    652

    Default

    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 Wally Hays; 08-11-2010 at 06:25 AM.
    Perception is 3/4 of reality

  6. #6
    Nuclear Engineer nukeman's Avatar
    Join Date
    Nov 2009
    Location
    VA
    Posts
    696

    Default

    Here's the link:

    http://www.ipscorp.com/pdf/studor/St...Crit_Jan09.pdf

    See page 16 (pg. 17 of PDF file).

  7. #7
    In the Trades Wally Hays's Avatar
    Join Date
    Nov 2009
    Location
    New England
    Posts
    652

    Default

    Thanks Nuke, ain't that a peach?

    Remember folks. I said that you can do it, not that you should.
    Perception is 3/4 of reality

  8. #8
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,638

    Default

    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. #9
    In the Trades Wally Hays's Avatar
    Join Date
    Nov 2009
    Location
    New England
    Posts
    652

    Default

    Yep. no argument here. Like I said, just because you can don't mean you should
    Perception is 3/4 of reality

  10. #10
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,638

    Default

    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. #11
    In the Trades Wally Hays's Avatar
    Join Date
    Nov 2009
    Location
    New England
    Posts
    652

    Default

    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.
    Perception is 3/4 of reality

Similar Threads

  1. Sewage pump
    By Joekid in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 12-20-2009, 10:28 AM
  2. Sewage Pump
    By enosez in forum Pumps and Tanks Well Forum & Blog
    Replies: 0
    Last Post: 02-17-2007, 05:05 AM
  3. Sewage pump
    By Chapy in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 10-23-2006, 06:01 AM
  4. Sewage Pump
    By kauleen_randi in forum Pumps and Tanks Well Forum & Blog
    Replies: 6
    Last Post: 06-22-2006, 10:57 AM
  5. sewage pump vs grinder pump
    By moorer in forum Pumps and Tanks Well Forum & Blog
    Replies: 2
    Last Post: 04-19-2006, 01:28 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •