Let me chime in here as I'm somewhat confused on the conclusion.
* Exposed group A plastics, expanded
* Storage height > 5', and less than 12'
* Max ceiling height 20'
* Storage is solid piled
* Storage is unstable
§15.2.2.1 directs me to the decision tree in Figure 15.2.2.1 and taking
the above into account I end up with being directed to Table 15.2.6(a)
or (b), and column C of that table. I believe the table number is an
errata in the standard as that specific table number - 15.2._*6*_(a) -
does not exist in the '16 edition, and is likely meant to direct me to
Table 15.2.2.5(a)
Following that decision tree to column "C" of the table, at a max
storage height of 12', and a ceiling height not exceeding 20' that
column shows a density of 0.5 gpm/ft².
§15.2.2.7.1 tells me the minimum remote area shall be 2500 ft².
The area modifications permitted do not apply as the density provided in
the table is not per EH1 or EH2, and there's no information on what
Chris shared that this is a closed array.
So I come up with a density of 0.5 gpm/ft² over a remote area minimum of
2,500 ft².
And in a quick look at the '22 edition, I come up with the same
area/density, although the section and table numbers have changed (of
course).
interesting question/problem,
*Ken Wagoner, SET*
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On 1/31/2023 1:03 PM, John Denhardt wrote:
Chris - you are correct. This is a storage chapter and not an
occupancy approach. .3/2,500 period. You are not using EH and
reductions do not apply.
/The above is my opinion and has not been processed as a formal
interpretation in accordance with the NFPA Regulations Governing
Committee Projects. This is provided with the understanding that the
AFSA assumes no liability for this opinion or actions taken on it and
they are not to be considered the official position of the //AFSA,
and/or NFPA or its technical committees.//AFSA cannot provide design
or consulting engineering services, and this opinion should therefore
not be considered, nor relied upon, as such./
/
/
Thanks,
John
John August Denhardt, PE
/Vice President, Engineering and Technical Services/
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On Tue, Jan 31, 2023 at 9:16 AM Chris Dorn
<[email protected]> wrote:
The commodity that I am dealing with is solid piled group A
plastics. Exposed, Expanded, Unstable, storage height >5 ft to
<12 ft with max ceiling height of 20’.
The particular section of code which I am questioning is below.
15.2.2.7(2) states that where table 15.2.2.5(a) allows densities
and areas to be selected in accordance with Curve EH1 there are
allowances for reduction of the hydraulic area to be reduced to
2000 square feet if 8.0 high temperature heads are used by
applying 15.2.2.7(2)(a). When I look at the section of table
15.2.2.5 the density called out is .3gpm. This is the density for
EH1 but is not called out as EH1 on table 15.2.2.5(a). My feeling
is that while the density called out is .3gpm it is not
specifically called EH1 like some of the other densities in the
same table. Therefore I should calculate 2500 square feet per
15.2.2.7(a) and I cannot apply 15.2.2.7(2)(a). Agree or disagree
and why?
*15.2.2.7* *For Table 15.2.2.5(a) and Table 15.2.2.5(b), the design
areas shall be as follows:
(1) The area shall be a minimum of 2500 ft2 (232 m2).
(2) Where Table 15.2.2.5(a) and Table 15.2.2.5(b) allow densities
and areas to be selected in accordance with Curve
EH1 and Curve EH2 of Figure 13.2.1, any density/area
from the curves in Figure 13.2.1 shall be permitted. When
selecting a point from the EH1 or EH2 density/area
curves of Figure 13.2.1, the following area reductions
shall be permitted:
(a) For K-8.0 (115) sprinklers used with Curve EH1, the
design area shall be permitted to be reduced by
25 percent, but not below 2000 ft2 (186 m2), where
high temperature sprinklers are used.
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