The drawings that I have do not detail wall construction except that
they will more than likely be sheetrock on stud walls and sheetrock
ceilings. Also, the closets have 4 levels of shelves that take up
most of the square footage. The issue here is that including the
closets, there would be approximately 60 sprinklers in a 1500 sqft
area and 40 in a 900 sqft area. Given that out square footage of each
closet is 15 sqft and the minimum EHP is 7 psi, you will get a
density of about 1 gpm/sqft from each head in the closet. OH1 vs OH2
is irrelevant.
At 06:06 PM 2/22/2008, you wrote:
Chris,e
Don't be so quick to jump to that conclusion. Another case of it
says this or it doesn't say that so I can do it. I think you should
be very careful here. Dig a little deeper and get to the logical
intent, and not just what it says or doesn't say in black and white.
This is an area separate from the dwelling areas, and is likely to
be crammed full of who knows what. In addition, there is no mention
of wall or ceiling contruction (which could affect one's direction
on this issue).
I agree with Greg that this is not likely what the NFPA standard
committee intends for this exception.
In reading the commentary in the Automatic Sprinkler Systems
Handbook on this issue, I believe there is merit to the fact that
the standards committee intended small rooms to mean small light
hazard/low fuel load rooms. This would not seem to be low fuel
loading, and is not, in my opinion, is an ordinary hazard area
rather than light hazard. And because it's storage, and you don't
know what could go in there, OH1 ain't good enough, it needs to be OH2.
Just my opinion
Jeff Hewitt, PE, SET, SFPE (Professional Member)
Corporate Engineer
Bi-State Fire Protection Corporation
241 Hughes Lane
St. Charles, MO 63301
636-946-0011
636-946-5172 (FAX)
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----- Original Message ----- From: "Chris Mak" <[EMAIL PROTECTED]>
To: "sprinklerforum" <[email protected]>
Sent: Friday, February 22, 2008 4:40 PM
Subject: Re: Gaggle of closets
Could you foresee a fire senario where the 47 extra heads would
operate. I think that this is exactly what the exception is for.
Regards
----- Original Message -----
From: "Paul Pinigis" [EMAIL PROTECTED]
Sent: 22/02/2008 05:30 PM EST
To: <[email protected]>
Subject: RE: Gaggle of closets
Don't you just love it when the letter of the code works in your favor.
I really don't think that this is what the NFPA 13 committee had in mind
when they developed that section.
Paul J. Pinigis, P.E.
Chief Life Safety Engineer
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Todd
Williams - FPDC
Sent: Friday, February 22, 2008 5:05 PM
To: [email protected]
Subject: Gaggle of closets
I am looking an apartment building which is to be designed according
to NFPA 13. On the first level, there is a room which contains 55 -
3'x5' tenant storage closets (mostly filled with shelves). These
would need to be sprinklered, which is fine, but the issue comes in
the hydraulics. Section 14.4.4.4.2 states that closets with a single
sprinkler may be omitted from the calculation. There could be up to
47 closets in the remote area. I have used this exception numerous
times, but never in this quantity. The standard says nothing to the
contrary, so I could eliminate 47 sprinklers in the remote area
because they are in closets? Is there something I am overlooking?
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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