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Fixture Count for Low Flow Toilt fixtures

Fixture Count for Low Flow Toilt fixtures

Fixture Count for Low Flow Toilt fixtures

(OP)
What would be the fixture count for these new high efficiency toilt fixtures.  I have 1.3 gpf Water closets and 1 pint urinals in a public building.  Need to size the swere lines but not sure if the old fixture counts would lead to larger than needed pipes.
thanks,

RE: Fixture Count for Low Flow Toilt fixtures

You still have to size them based upon the particular plumbing code and the fixture units ascribed to them.

But there is nothing to say you have to use a 4" for the toilets.  I have started to use 3" for the lower flow toilets to help with drain line carry.  

The manufacturer even suggested it.

RE: Fixture Count for Low Flow Toilt fixtures

Which manufacturer suggested the 3" drain Pedarrin? That is something we'd been tossing around as an idea for a while in the office.

RE: Fixture Count for Low Flow Toilt fixtures

It was Zurn.

We had a project where the owner wanted to go Leed Platinum and to do our part for water conservation, we specified a Zurn pressure assist toilet that flushes 1.0 gpf.  I call it our "spit" toilet, because that is about all it puts out.

I wasn't about to put a 4" pipe on that thing.

In talking to the Zurn rep, he recommended 3" pipe on anything less than 1.6 gpf.

The codes have gotten a bit easier.  It used to require 4" on anything that had more than 3 toilets.  They took that part out so we seriously consider it in our designs.

We also put a cleanout fairly close - even if not required by code.  3" pipe is better than 4" for these low flows, but it still is not very much water going down the pipe.

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