Basement Ejector Pump Venting for Washing Machine

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by dbgreg, Nov 11, 2009.

  1. dbgreg

    dbgreg New Member

    Messages:
    3
    Location:
    Delaware
    I have an existing wet vented ejector system in my basement floor. I am planning on adding a washing machine drain to this system and have some questions about the best way to do this.

    I have an attached proposed diagram to help explain the system and questions that I have.

    If anyone has better suggestions - feel free to suggest and I can update the diagram :}

    My questions about this proposed rough-in:
    1. Can the washing machine vent "C" share the stack with ejector pump?
    (best if it does not, but I do not have another accessible vent)

    2. Does this washer drain need to be vented in the first place?
    (since rest of system is wet vented - will add or not adding the vent cause trap problems?)

    3. Curious, can vent “C†be 2" pipe instead of a standard 1 1/2" pipe
    (Is there a reason that standard vents are 1 1/2" for flow, etc.?)

    4. Should I vent sink “E� or leave it wet vented like the rest of that system?
    Will venting cause problems pulling the traps?

    Thanks and look forward to recommendations!

    Attached Files:

  2. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Messages:
    1,142
    Location:
    South*East
    There is no vent on the toilet or shower and the laundry should tie in below the sink drain. Vent E should tie into C. Where C ties into the stack it should be 6" higher then the stand pipe on the laundry drain.

    John
  3. dbgreg

    dbgreg New Member

    Messages:
    3
    Location:
    Delaware
    Updated image to reflect John's input

    Thanks John - Updated image to reflect your recommendations

    Thanks,
    Greg:)

    Attached Files:

  4. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    You can't dump the washer drain into the lav.

    IPC code, the washer needs to drain into a 3" stack or main, it can not share the drain with the lav.
  5. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Messages:
    1,142
    Location:
    South*East
    Sorry, I didn't see the reducer under the slab. I saw the 4" going beyond the toilet and didn't look any further.

    John
  6. dbgreg

    dbgreg New Member

    Messages:
    3
    Location:
    Delaware
    So I need to cut out the concrete to the 4" main pipe and tie "D" directly into that 4"
    Leave the venting "C" on the washer drain and still add the vent "E" to the lav?
    or will "E" venting cause any problems?

    Thanks again,
    Greg

    Attached Files:

  7. Terry

    Terry Administrator Staff Member

    Messages:
    14,794
    Location:
    Bothell, Washington
    That picture makes me woozy.

    I prefer to individually vent fixtures that are going to a pump system.
    For the price of a few fittings, you know it will work.

    And dumping a washer into the end of that?
    That will do a good job of siphoning all the traps below it.

    Have you ever wondered how smelly a sewage pit can get?
    Siphon a few traps and you will know.
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