Washing machine & laundry sink venting

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by hoffmand, Sep 9, 2010.

  1. hoffmand

    hoffmand New Member

    Messages:
    20
    Location:
    Austin, TX
    We've just added a sink to our laundry room. The finished setup is the same as Terry's diagram below, but without the extra vent for the washer. The plumber insisted this was not required for code (Texas) since the 2" drain/vent was big enough such that the drain from the sink would not affect the ability of the washer to vent if they were both draining at the same time.

    I know code is different depending on the city so I'm more concerned with the functionality of the drain/vent. Will i have any issues without the extra vent "jumper" for the washing machine?

    Thanks,
    Dave

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  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,443
    Location:
    Bothell, Washington
    You should be fine.
    We used to plumb without the extra vent here in Washington, in fact this was done first without the extra vent, but codes change, and now the inspectors here want it vented like in the picture.
    If your plumber knows the inspector and what he likes, then you're golden.

    I like to use diagrams and pictures that work in all 50 states when I can.
  3. hoffmand

    hoffmand New Member

    Messages:
    20
    Location:
    Austin, TX
    Thanks, Terry. I wanted to do a sanity check, just in case.
  4. Steve_P

    Steve_P New Member

    Messages:
    41
    Location:
    East TN
    Hey Terry I have some questions on that picture:

    who makes that sexy washing machine outlet box? I like the built in hammer arrestors and valves. Do you have a part number handy for it?

    also, just curious, are those copper lines running to the washer valves? I ask because of how they're bent. And why did you insulate both the hot and cold?

    Too many questions :)
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,348
    Location:
    New England
  6. Terry

    Terry Administrator Staff Member

    Messages:
    15,443
    Location:
    Bothell, Washington
    It's PEX on the swooping part, and I covered it to prevent sunlight from hitting it during construction.
    I think Oatey made that box.
  7. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    The Sioux Chief Ox Box is really slick, I wouldn't buy any box that didn't have hammer arrestors and lots of options for mounting.
  8. ballvalve

    ballvalve General Engineering Contractor

    Messages:
    3,261
    Location:
    northfork, california
    Hammer arrestors are just stupid, unless they have captive air chamber, or you have air entrained water... Those little stubs are just full of water, and mean NOTHING, if you understand hydraulics. LOOKS great though, I admit!

    Maybe there is a diaphragm inside that pipe, then its a good addition to the house. Otherwise, its just a bit of pretty copper without a use.
  9. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    They're not just a chunk of pipe with a cap in the end...
  10. Terry

    Terry Administrator Staff Member

    Messages:
    15,443
    Location:
    Bothell, Washington
    Ballvalve, those are hammer arrestors with pistons in them to prevent water logging. They are now part of the plumbing code.

    Not a plumber I'm guessing.

    [​IMG]
    Last edited: Jan 1, 2011
  11. Steve_P

    Steve_P New Member

    Messages:
    41
    Location:
    East TN
    Thanks for the replies.

    Hey Terry, where are hammer arrestors now required to be used per code? Ok, wait, when I say where, I mean locations in a home's plumbing, not geographic location of the home. I realize this will vary by geographic location, but on locations within the home, I would assume washing machine as a safe bet, and maybe dishwasher? I have seen posts on this site using them with an icemaker also. is that necessary? We get major water hammer from the clothes washer (no arrestors), and a light hammer from the toilet, but not from the icemaker. We don't use the dishwasher, we're old-school on that and use the sink!
  12. Terry

    Terry Administrator Staff Member

    Messages:
    15,443
    Location:
    Bothell, Washington
    Washer, hot and cold.
    Dishwasher on the hot side.
    Icemaker cold.

    Any quick closing valve.
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