Last time I had to apply this was under an overhang with storage. Area/density but I was only flowing 4 heads so I picked up the rest of the flow at the riser. Not really room design because the adjoining space was the great outdoors. I would think the area/density requirements would bot extend to room design.
Nick Maneen 704-791-7789 On Mon, Apr 22, 2019, 6:19 PM Steve Leyton <[email protected]> wrote: > We have a building with fire rated and secure compartments that are less > than the NFPA 13 minimum design areas so we have calculated those areas > using the room design method where the compartments comply. Two are fire > protected with preaction sprinklers and 23.4.4.2.5 seems to imply that > where a design area is flowing less than what the density would be across > the minimum required design area, then a “kicker” needs to be added to > raise the flow rate to that figure. Since we’re in Light Hazard and the > design area is only about 1,000 sq. ft., we’re flowing about 150 GPM. > But they’re coming after us for 1,500 x 1.3 = 1,950 saying the required > flow rate is 195. If it’s LH, we can downward adjust and the demand drops > to 117 which we satisfy. In all my years I’ve never had this section > thrown at us so could use any help or opinion regarding exactly how this > section should be applied. > > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >
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