Using an ESFR sprinkler at 100 GPM for 12 sprinklers may be more of a cost savings.
Art From: Trillium Fire Sprinkler Design INC <trilliumf...@cwisp.ca> Sent: Saturday, December 03, 2022 7:53 AM To: 'Discussion list on issues relating to automatic fire sprinklers' <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Re: NFPA 21 VERSUS 22 Thanks Ken. Exactly what I was thinking. Just needed clarification. Troy From: Ken Wagoner <k...@parsleyconsulting.com <mailto:k...@parsleyconsulting.com> > Sent: December 2, 2022 11:57 AM To: sprinklerforum@lists.firesprinkler.org <mailto:sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Re: NFPA 21 VERSUS 22 It would be helpful in we were shown where you came up with the references for both a density of .325 and an increase of 175%, and perhaps most of all where you're directed to "22" (guessing you meant Chapter 22?), as that chapter covers the use of CMSA sprinklers. Table 21.4.1.2.2.1 addresses class II, non-encapsulated storage to 25' height, with 8' aisles to figure 21.4.1.2.2.1(b), and curves A or B. Curve a for high temp sprinklers shows 0.325 gpm/ft² over 2,000 ft², which matches what you've quoted. If ordinary temp sprinklers are selected (curve B) the density jumps to 0.375 gpm/ft². And yes, the density is required to be increased per the graph in Figure 21.4.1.7.1 to 175% of the values from the curves when the height of storage exceeds 20'. That would result in densities of ± 0.569 for high temps and ± 0.656 for ordinary temps. I hope this is of some value, Ken Wagoner, SET Parsley Consulting 500 West Mechanic Street Harrisonville, Missouri 64701-2235 Phone: (760) 745-6181 Visit the website <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.parsleyconsulting.com%2f&c=E,1,Y5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9ZqW2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_n5hDHeK&typo=1> On 12/2/2022 9:23 AM, Trillium Fire Sprinkler Design INC wrote: I have a warehouse that has double row rack storage to 25 feet with 8 foot aisles. Class II commodity non encapsulated. 21 says that .325 density apply the increase of 175% for the 25 foot storage. Using CMDA sprinklers But then says if using CMDA sprinklers use 22. I am confused!!!!!!!!! Which chapter do I use. _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org <mailto:sprinklerforum-le...@lists.firesprinkler.org>
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