Waste Pipe Code in NYC

Posted by RicodJour on July 19, 2007, 10:06 am

On Jul 18, 3:02 pm, kirk.lin...@gmail.com wrote:

> Hello,
> I live in a 3 unit co-op that has a waste pipe on one side of the
> building that is 2 inches. Feeding that pipe are three dishwashers,
> three sinks and a washer/dryer. Can anyone tell me if this is in-code
> for NYC? How much can such a waste pipe handle? Thanks

One clothes washer requires a 2" waste line. NYC has its requirements
and I don't have the specifics, but you're substantially undersized
for the current code.

R

Posted by Wayne Whitney on July 19, 2007, 11:33 am

> On Jul 18, 3:02 pm, kirk.lin...@gmail.com wrote:

> > I live in a 3 unit co-op that has a waste pipe on one side of the
> > building that is 2 inches. Feeding that pipe are three dishwashers,
> > three sinks and a washer/dryer. Can anyone tell me if this is in-code
> > for NYC? How much can such a waste pipe handle? Thanks

> One clothes washer requires a 2" waste line. NYC has its requirements
> and I don't have the specifics, but you're substantially undersized
> for the current code.

I don't know anything about the NYC code, but I have information on
the [2000 IRC] and the {1997 UPC}. A 2" vertical drain is good for
[10] or drain units. A clothes washer counts as 2 units. A
kitchen sink counts as 2 units. I don't believe that dishwashers are
counted separatedly, since they drain through the kitchen sink trap.
So my understanding is that under both the 2000 IRC and the 1997 UPC,
the 2" vertical drain is adequate for the fixtures listed. Note that
a 2" horizontal section is only good for [6] or fixture units, so
if the 2" drain does turn horizontally, it would violate the 2000 IRC
but not the 1997 UPC.

Cheers, Wayne

Posted by Dennis on July 23, 2007, 5:24 pm

NYC plumbing code is based on the 2003 or 2006 (depending if the 2006 was
adopted yet) International Plumbing Code (IPC).

In the IPC, domestic sinks with dishwashers are rated at 2 dfu each (1-1/2"
trap arm & vertical portion increased to 2"), for a total of 6 dfu's, and
domestic washing machine (2" trap arm) rated at 2 dfu (3 dfu for
commercial). Your total connected load is 8 dfu.

A 2" drain can carry 6 dfu (drainage fixture unit) for a horizontial branch
(3 if circuit-vented fixtures are connected), 6 dfu as a total discharge
into a single branch interval, 10 dfu for a stack of 3 branch intervals or
less, and 24 dfu for more than three branch intervals.

Therefore, you are ok for the vertical portion (stack), a little over for a
horiz portion -if they all enter the stack at the same level-; or ok if
there are two or more horizontal branches attached to the stack.

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Waste Pipe Code in NYC - Page 2