[Greenbuilding] 2" drain line for a 0.8gpf toilet?

[home-nrg]

----- Original Message Follows -----
From: "John Salmen" <terrain at shaw.ca>
To: <joe at ks-ranch.com>, "'Green Building'"
<greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] 2" drain line for a 0.8gpf
toilet?
Date: Sun, 24 Apr 2016 20:03:41 -0700

> I can echo Joe on this and the cadet is a good design as
> it has restricted flow to provide a scouring action - and
> that said oversizing pipe can be a problem for the same
> reasons - but current designs are based on 3" and perform
> well and that is where I would want to sit 'so to speak'.
> 
> -----Original Message-----
> From: Greenbuilding
> [mailto:greenbuilding-bounces at lists.bioenergylists.org] On
> Behalf Of Joe Killian Sent: April-24-16 4:47 PM
> To: greenbuilding at lists.bioenergylists.org
> Subject: Re: [Greenbuilding] 2" drain line for a 0.8gpf
> toilet?
> 
> Reuben,
>    The American standard Cadet 3 toilet (a popular and
> very good unit) has for it's exit aperture:
> "Fully-glazed 2-1/8" trapway with 2" ball pass"
>    If there's a stoppage anywhere, you'd want it to be AT
> the toilet, not somewhere down the pipe.  So a pipe
> substantially larger than the fixture's exit aperture
> would be advisable.
> 
>    With a macerater, a 2" pipe is acceptable, afaik. 
> ..If you wanted to trade that complication for the smaller
> pipe. Joe
> 
> 
> On 4/24/2016 3:29 PM, Reuben Deumling wrote:
> > I have long wondered whether or when anyone would dare
> > diverge from  the 3" standard drainline diameter as we
> > get toilets that use less and  less water per flush.
> > Interpolating from this chart: 
> >
>
http://www.mpwmd.net/rules/Apr2008/pdfs/RegII/rule24_table1.pdf
> > I see that in terms of fixture units, a 0.8gpf toilet is
> > now at 1,  which puts it comfortably within the same
> > class as sinks, which as we  know do not require
> > anywhere near a 3" drainline. So..... does anyone  on
> this list know if there is any movement toward allowing a
> > 2"  drainline for a 0.8gpf toilet? Or whether there's
> > been any testing of  this configuration?
> 
> If the drain pipe is an impediment, why not just install a
composting toilet?
(Save tossing the dung balls; I'm being facetious.)
Bob Klahn
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