The NSPC permits s-traps?

Discussion in 'NSPC Plumbing Code Questions' started by North Jersey, Jun 30, 2010.

  1. Terry

    Terry Administrator Staff Member

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    Bothell, Washington
    Which ever way you go, could you post some pictures when done?
    Terry
  2. SewerRatz

    SewerRatz Illinois Licensed Plumber

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    1,705
    Location:
    Chicago, IL
    Hi guys. Here in Illinois it is against code to run the disposal into a end waste and use a single trap. Each fixture has to have its own trap. The way we do it is a 2" line in the wall come out with a 1 1/2 double Wye. The center of the double Wye would be the clean out, then each side of the double Wye would have a trap. So the picture here is not that far off base to what meets the Illinois plumbing code.

    [​IMG]
  3. North Jersey

    North Jersey New Member

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    If I'm ever done, I'll gladly post some pictures. :)

    Terry and Doherty tell me the type of installation in the picture will result in siphoning. Have you ever experienced this phenomenon with your double wye configuration?
    Last edited by a moderator: Jul 2, 2010
  4. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Messages:
    1,705
    Location:
    Chicago, IL
    Nope never had an issue. As I said its allowed here in Illinois. Its best to check with your local plumbing inspector to see what meets the code by you.
  5. North Jersey

    North Jersey New Member

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    107
    Why not disconnect the p-trap at the union for a cleanout? What's the benefit of the double wye?
  6. Terry

    Terry Administrator Staff Member

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    15,014
    Location:
    Bothell, Washington
    There always needs to be a cleanout on a kitchen sink.
    The double wye makes sense too. One trap doesn't run by the other like in the first drawing, it's more like a double fixture fitting in that the arms come in equally and not by each other. The cleanout in the center would be the same in other codes as the clean out either on the arm or on the vertical below.
    Kitchens need cleaning out more then most other fixtures because of the grease, and from the disposers.
  7. North Jersey

    North Jersey New Member

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    107
  8. Terry

    Terry Administrator Staff Member

    Messages:
    15,014
    Location:
    Bothell, Washington
    It would seem to be true, however we always have to look at the local inspector and please him or her.

    Years ago, I plumbed seven meat markets for a large chain. Since the stores were located in different cities and counties, I had to meet with each local inspector to find out how I was going to pass inspection. Everything was supposed to be UPC code, however I wound up plumbing each one differently.
  9. North Jersey

    North Jersey New Member

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    107
    Those prima donnas. :D
  10. North Jersey

    North Jersey New Member

    Messages:
    107
    I think the branch vent below is very dubious, but how does the rest of the sketch look?

    Kitchen Sink.jpg
  11. North Jersey

    North Jersey New Member

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    107
    The inspector didn't allow that connection below the flood rim, even though the ejector would prevent a backup in the event of a clog. I guess a foolproof system is the way to go. I'll just have to tie into a different vent group where I can connect at an appropriate height above the flood rim.

    The inspector also told me that he wanted a 2" vent for the ejector, but I think the applicable code says 'the sump for macerating toilets shall be vented with a 1-1/4" pipe.' (NSPC 11.7.10) The manufacturer's guideline for my pump is 1-1/2", and my system is a self-contained SaniFlo unit that is designed to sit above grade. The inspector is the type of guy who seems pretty open to feedback, but I don't want to risk burning any bridges on a fairly minor issue. I may need to rely on his generous spirit if I ever try to expand my septic system.
    Last edited by a moderator: Jul 13, 2010
  12. North Jersey

    North Jersey New Member

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    107
    The inspector ended accepting the manufacturer's instructions (1-1/2" vent) becaue the SaniFlo is more like a macerating toilet than an ejector pump.
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