Plumbing for ejector pump discharge-

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by cacher_chick, Dec 23, 2010.

  1. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    I am installing an ejector pump for a basement bath and I have not seen any specific references to common/best practices when routing pipe for the ejector pump discharge. Does a plumber install the line using the common rules for branch drains?

    Is it recommended that the horizontal pipe run be pitched to drain on it's own?

    Should one use long sweeps for bends?

    In a 40 foot run with 3 90 degree bends, should there be cleanout(s) installed in the line?

    Happy holidays- I hope everyone is putting their tool bags away for the weekend!
  2. Gsalet

    Gsalet George the Plumber

    Messages:
    83
    Location:
    San Francisco
    Code requires the pump discharge to enter the gravity drain line at the top of the line with a wye fitting. I would suggest piping vertical straight up if possible then letting it drain horizontally to the tie in, I would also recommend using long sweep fitting were ever possible and clean-outs where accessible.
    George
  3. Basement_Lurker

    Basement_Lurker One who lurks

    Messages:
    668
    Location:
    Victoria, BC
    There are a lot of wrong ways to pipe in an ejector pump unit; I suggest you research as much as possible before attempting this installation. I'll give you a few hints though to get you started:

    Do not vent your unit with a mechanical vent, even if the literature says it's fine to do so...you will have a suction problem with the pump.
    Do not pipe your outlet riser with sections on a 45 incline
    Do pipe in unions into your drain and vent piping to allow servicing of the pump unit
    Do make some provision for draining the outlet line when the pump unit fails and requires servicing
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,472
    Location:
    Cave Creek, Arizona
    quote; Do not vent your unit with a mechanical vent, even if the literature says it's fine to do so...you will have a suction problem with the pump.
    Do not pipe your outlet riser with sections on a 45 incline
    Do make some provision for draining the outlet line when the pump unit fails

    1. An AAV will NOT cause a suction problem, but WILL cause a fixture drainage problem.
    2. ANY incline is okay for the discharge.
    3. The slope of a discharge line is not critical, and it can even go uphill if necessary, but sloping downwards is desirable if possible to aid in emptying the line between cycles.
    4. Be sure to install a check valve in the discharge line.
    5. You may not have to "drain" the discharge line, but do provide a valve to keep the water IN the line, if you have to service the pump or check valve.
  5. Basement_Lurker

    Basement_Lurker One who lurks

    Messages:
    668
    Location:
    Victoria, BC
    hmm, well it has been my experience that ejector pumps will lock up if you try to use a mechanical vent, I wonder what brand you are using Hj?
  6. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    Thanks guys;

    I have already installed a new vent to the roof, so I'm set there. I was more curious about the importance of which bends to use and whether to install a cleanout.

    The check and ball valve is explicitly stated in our code, so that was a no-brainer.
  7. Basement_Lurker

    Basement_Lurker One who lurks

    Messages:
    668
    Location:
    Victoria, BC
    Most manufacturer documentation state that you should be using long bend fittings. A cleanout is always good idea...not that I have seen many piped in.
  8. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Make up your mind, should we have a valve or not...?
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