bottom line is you are required to drop a rectangle over the area that
creates the greatest hydraulic demand. Excluding a 0.4 density area
to include a 0.17 area (with smaller K-factors) can be safely assumed
to present less of a demand. Show me the numbers if you want to do
something that appears wrong to prove it is acceptable.
If the area of the higher density is smaller than the minimum size,
then you pick up sprinklers from an adjacent area with a lower
density. The TC has gone to great pains to address this in A.11.1.2
(as well as in 12.1). Even expanded it this cycle to address areas
smaller than the size for the higher hazard but larger than the
surrounding classification (ie a 1600 sf EH in an OH building which
the current text would imply to do a 1500 sf remote area).
As someone already said, seems this is a closed case of just not
following the procedure of ch 22.4.4.1 (or lack of understanding what
is meant by HYDRAULICALLY most demanding).
Roland
On Apr 3, 2012, at 8:50 AM, <[email protected]>
<[email protected]> wrote:
Got a submittal package where the contractor has two divided rooms.
One is 0.40/3000 and adjacent room is .17/2000. He is calculating
the .40 area and has extended his hyd remote area beyond the wall of
the room into the adjacent .17 area and calced about 8 heads.
The .40 room is plenty large enough to allow the additional
sprinklers to be calced from within the room.
Off the top of your head does anyone know where this type of thing
is addressed within NFPA 13?
Craig L. Prahl, CET
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