pipe size /max length of run for kitchen, Canada Code

Discussion in 'Canadian Plumbing Code Questions' started by Philbert, Aug 7, 2010.

  1. Philbert

    Philbert New Member

    Messages:
    5
    Location:
    Toronto,Ontario,Canada
    hello
    I have been asked to rough in a new kitchen, it has 1 double sink and a dishwasher beside it, the soil pipe is 25 to 30 feet away, I don't want to run 3 inch all the way if it isnt needed , thanks
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,515
    Location:
    Cave Creek, Arizona
    Even IF 1 1/2" would be approved, there is no way I would EVER use it for anything other than a vent. I ALWAYS use 2" minimum for my drain lines.
  3. Philbert

    Philbert New Member

    Messages:
    5
    Location:
    Toronto,Ontario,Canada
    the problem I am having is that if I seach online for a quote from the npc I get a vague reference to some "complicated table" in the plumbing code book which I can acces online unless I pay for it or order a copy of the code book for a price of course,if ther is no restriction all the better, although I will likely use 2 inch anyways, ohhh the 25 to 30 foot run is a sloped run not a drop ifin that changes anything
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    It is not a "complicated table" at least not in the books down here. Each fixture is desinated by a number which correlates to how much water is likely to go in it. The number is called "fixture units". In the UPC, a kitchen sink is 2 FU. By the simple table, the maximum # of FU on a horizontal 1½" pipe, beyond the trap arm, is ONE. So the sink needs to drain into a 2" lateral. The horizontal length ( with 1/4" per foot slope minimum) is unlimited.
  5. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    1.5" is perfectly acceptable as long as you pick up your vent within 6'.

    I usually have a 1.5" fixture drain picked up by a 2x1.5x1.5" tee.
  6. Terry

    Terry Administrator Staff Member

    Messages:
    14,911
    Location:
    Bothell, Washington
    I haven't seen 1.5 for kitchens since the 50's in the lower 48, not Canada though.

    Here we use a 2" waste line until the vent, and then a 1.5" trap arm. we are allowed 42" for the 1-1/2" trap arm.

    I guess the Canadian code for kitchen plumbing is pretty weak.
    Last edited: Jun 29, 2013
  7. Plumber1979

    Plumber1979 Certified Plumber

    Messages:
    16
    Location:
    Ontario
    im a plumber here in Ontario and its just fine to use 1 1/2 on a kitchen and it 5' for the vent
  8. mikeplummer

    mikeplummer Plumber

    Messages:
    190
    Location:
    Ontario, Canada
    1-1/2" is fine. trap arm max is 5' (1.5m). cleanout required on fixture drain or union p-trap. cleanouts every 20' (6m).. you'll want to make sure your slope is right to keep a kitchen sink line that long, clear of grease etc.
    secondly NPC is not what you need. you need to refer to the Ontario Building Code section 7 - Plumbing
  9. Sean Beck

    Sean Beck Plumber

    Messages:
    68
    Location:
    Toronto, Ontario, Canada
    1.5" is permitted by code providing the vent is connected within 5ft and there is a clean out every 6m. Personally with it being a kitchen drain which is subject to grease build up, I would use 2" with cleanout every 6m.
  10. mikeplummer

    mikeplummer Plumber

    Messages:
    190
    Location:
    Ontario, Canada
    your posts suggest that your reply to the request of the customer should have been " I don't know plumbing - perhaps you should consult a plumber "
  11. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,515
    Location:
    Cave Creek, Arizona
    pipe

    The code is a "minimum standard", and I do not know any "competent" plumber who has ever had to snake a sink drain who would use less than 2". With 3" you run into the problem of NO "self scouring" because the velocity is too slow. Use 2"!!!!!!
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