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

Philbert · Aug 7, 2010

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

hj · Aug 7, 2010

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.

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Philbert · Aug 7, 2010

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

Jimbo · Aug 8, 2010

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 1Â½" 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.

Doherty Plumbing · Aug 15, 2010

Philbert said:
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

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.

Terry · Aug 15, 2010

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.

Plumber1979 · Jul 16, 2012

im a plumber here in Ontario and its just fine to use 1 1/2 on a kitchen and it 5' for the vent

MikePlummer · Jul 25, 2012

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

Ontario Plumber · Jun 14, 2013

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.

MikePlummer · Jun 22, 2013

Philbert said:
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

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 "

hj · Jun 29, 2013

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"!!!!!!

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

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