I had another thought. How much testing has been done on pitched
roofs? There has to be a point where sprinklers impact each other
when the deflectors are not parallel and it is probably a function of
angle and distance. When the deflectors area parallel, the 6 ft
distance has been determined as an acceptable minimum. As the angle
between deflectors increases and the spray starts to point towards
adjacent heads, would the acceptable distance likewise increase? You
have spray that is pointing at adjacent sprinklers and at some angle,
interference is going to occur. This would occur with both
arrangements in 8.6.4.1.3.1. Any thoughts?
At 10:09 PM 5/23/2008, you wrote:
Todd,
Nothing, to my knowledge, is approved for such a steep slope. I
suggested the attic sprinklers in response to the suggestion for
sidewall sprinklers at the peak. My only intent was to suggest that,
if you're going to go beyond the defined limits of a type of
sprinkler, you should at least start with a type that at least is
intended to work in a similar application. I can't say that the
attic sprinklers will work, but if they won't, sidewall sprinklers
at the peak certainly won't work either.
Joe
Todd Williams - FPDC wrote:
Joe, Attic sprinklers aren't approved for slopes greater then 12:12
and I have about 28:12. Also, I didn't think you could use attic
sprinklers in occupied spaces.
This is an occupied space (church sanctuary) not a concealed one.
Also, this is a historic building (c. 1859) and is very
architecturally sensitive. The pipe is exposed and soffits and
baffles are not an option.
At 02:27 PM 5/23/2008, you wrote:
Could you use Attic sprinklers at the peak? They accomplish the
same intent as sidewalls at the peak, and have actually been
tested in that configuration.
Joe
Todd Williams - FPDC wrote:
I am working on a historic church sanctuary with a pitch of
approximately 28/12. The arrangement calls for branch lines to be
symmetrical on each side, similar to NFPA 13 (2002) figure
8.6.4.1.3.1(b). I can meet the requirements for the steeply
pitched roof section 8.6.4.1.3.3 and my "S" distance over the
peak is good, but my straight line distance between sprinklers
would be less than 6 ft and the deflectors would be effectively
pointing the discharge towards the sprinkler on the opposite
side. I think I have a problem here, but I am not sure how to
address it. Any thoughts?
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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