The starting point is the explicit guidance that addresses the last
sprinkler or branch line against a wall. You apply the longest
dimension from either side for both S and L. This places the
sprinkler in the center of the imaginary rectangle. The same
philosophy applies to non-symmetrical layouts within the system. Yep
there is a lot of overlap but it provides a consistent methodology.
Roland
On May 9, 2008, at 5:30 AM, Dewayne Martinez wrote:
I have recently had a disagreement with a AHJ on how to determine the
protection area of coverage for a sprinkler.
In my situation, we have an OH II area which has extended coverage
sprinklers (14x14) and one standard throw sprinkler.
The distance between the extended and standard sprinkler is 12 ft. I
was taught that since we are proving the EC sprinkler at 14x14, you
would take 7ft off the distance between the sprinklers and use 5ft as
the one of distances (x2=10ft) to determine the area of coverage for
the
standard sprinkler. He states that per NFPA, you would use the
distance
between the sprinklers (ie:12ft).
We are going 13ft between sprinklers the other dimension so using my
way
we are at 130sq ft but his way we are 156sq ft.
Which way is right?
Thanks,
Dewayne
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