Ben,
Your reason for heartburn is the same reason that the esteemed Mr. Greenman
started to talk about the goals of Residential Sprinklers.
But the goals of residential sprinklers ("just" life safety) go out the window
when you make that sprinkler throw twice the water for which as it was listed.
So maybe the "small room effect" can happen and still meet the goals of NFPA 13
even with Residential Sprinklers. Perhaps a residential sprinkler can still
spray water very high on the wall and provide "control" and "property
protection" in a small room as it throws twice the water. Perhaps a room that
is small enough to contain the heat of a fire and quickly activate sprinklers
before the fire grows too large would still allow a residential sprinkler to
utilize the "square footage allowance" that applies to standard spray
sprinklers. And maybe the important "life safety goals" would still be met
too! Hmmm......
So a guy named Jack said, "Yo Committee Dudes! Let's allow this. You know
that's what you meant." And all the Committee dudes said, "OK, we can do that.
We'll put it in the annex with the other explanatory stuff."
Then a guy named Ken said, "Whoa dudes..... that's cool stuff, why don't we put
this in the rules instead of in the freakin' back of the book??" And the
Committee dudes said, "Whoa....kewl idea! Jack was right! And yer right, too!
Let's DO IT!!!!"
So I am gonna write a book on Calc's called "Dude, Be the Water!" whadya
think?!?!
Sincerely,
Some guy named Cecil
> Date: Mon, 1 Nov 2010 20:13:43 -0400
> Subject: Re: Residential "Room Design Method"?
> From: [email protected]
> To: [email protected]
>
> That makes no sense. How did the committee allow a reference to SSU/P
> spacing criteria under residential sprinkler design. It just makes so
> little sense. I was thinking about it as I was driving home... If this is
> truly the intent of the code (to average the spacing of residential heads in
> small rooms) the correct (in my opinion) IE, non-confusing way to do this
> would be to put the same language in the Chapter 8 section about residential
> sprinklers or pull 8.6.2.1.2 back into 8.5 or anything other than
> referencing residential design methods from SSU/P spacing rules.
>
> I can't be the only person who thinks that doesn't make a lot of sense, can
> I?
>
> I'm also shocked that I never noticed this before. Believe me, I checked
> the 2010 edition, thinking maybe it was a mistake that got rectified, etc.
> So I guess part of this is sour grapes too.
>
> Benjamin Young
>
>
>
> On Mon, Nov 1, 2010 at 7:31 PM, Roland Huggins
> <[email protected]>wrote:
>
> > IT is applicable. In a 13 system, the residential option is now a hybrid
> > where we apply both spray sprinkler criteria (ie small room) and residential
> > then apply the most demanding.
> >
> > Roland
> >
> >
> > On Nov 1, 2010, at 3:35 PM, ParsleyConsulting wrote:
> >
> > Ben,
> >>
> >> I don't know that we've missed that reference to SSU/SSP in 8.6.2.1.2. I
> >> would hope that most of those who'd answered had reviewed the information
> >> that generated the question in the first place, which is in 11.3.1.3, item
> >> (2). That clearly suggests that the allowance for the discharge to be
> >> calculated the same as it would for a small room is acceptable for
> >> residential sprinklers as well.
> >> --
> >> PARSLEY CONSULTING
> >> Ken Wagoner, SET
> >> 760.745.6181 voice
> >> 760.745.0537 fax
> >> [email protected] <mailto:[email protected]>e-mail
> >> www.ParsleyConsulting.com <http://www.ParsleyConsulting.com>website
> >>
> >>
> >>
> >> On 11/1/2010 1:28 PM, Ben Young wrote:
> >>
> >>> You guys have all missed a major issue with using 8.6.2.1.2 in 2002 or
> >>> 2007.
> >>> The small room rule is for SSU and SSP heads ONLY, not residential heads.
> >>>
> >>> So if you're using LFII residential heads in a 256 sqft room, but you're
> >>> spaced 10' off two walls, you have to use the 40 GPM figure, not 25.6.
> >>>
> >>> Benjamin Young
> >>>
> >>>
> >>>
> >>> On Mon, Nov 1, 2010 at 12:46 PM, Sharon Alves<[email protected]
> >>> >wrote:
> >>>
> >>> NFPA 13, 8.6.2.1.2 If it meets the small room criteria - "The
> >>>> protection
> >>>> area of coverage for each sprinkler in the small room shall be the area
> >>>> of
> >>>> the room divided by the number of sprinklers in each room."
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> SHARON ALVES
> >>>>
> >>>> Senior Fire Sprinkler Designer
> >>>>
> >>>>
> >>>>
> >>>> LP Consulting Engineers, Inc.
> >>>>
> >>>> Mechanical - Electrical - Plumbing Engineers - Fire Protection
> >>>>
> >>>> 1075 Creekside Ridge Drive, Suite 175
> >>>>
> >>>> Roseville, CA 95678
> >>>>
> >>>> P: 916.771.0778 - F: 916.783.9446
> >>>>
> >>>> [email protected]
> >>>>
> >>>>
> >>>>
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