I believe they ARE cartooned, but I will confirm that in the AM. And the 18 clear number is the one I was looking for the most, thanks for directing me out of Ch 17! Both my 2013 and 2016 editions have 17.2.1.4 (4):
Maximum 15 Storage in a maximum 25 ft high building with ceiling sprinklers designed for a minimum .45 gpm/ft2 density over 2,000 sq ft and one level of in rack Sprinklers required at alternate transverse flues as shown in figure 17.2.1.4 (d). I think I miss NFPA-231C too much Thanks, John Paulsen SET Crown Fire System Design 6282 Seeds Rd. Grove City, OH 43123 P 614-782-2438 F 614-782-2374 C 614-348-8206 From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Parsley Consulting Sent: Thursday, January 26, 2017 5:18 PM To: sprinklerforum@lists.firesprinkler.org Subject: Re: Rack Storage of Group A Plastics to 12' John, I'm a little confused on what you're looking over. As I understand your situation: * 12' of rack storage of Group A Plastics * 15' ceiling elevation above The CMDA design parameters in chapter 17, are applicable if the commodities are stored in cartons, per 17.2.1.2.1. So, are they cartoned? Now here's where I get lost. * In my edition of -13, there is no 17.2.1.4(4). It would seem appropriate to me that the approaches in Figure 17.2.1.2.1(b) would be applicable as * storage does not exceed 15'-0" * clearance to ceiling does not exceed 10'-0" * Figure 17.2.1.2.1(c) does provide a protection method for such storage * Storage height up to 20' * Clearance to ceiling less than 5'-0" * density of 0.45 gpm/ft² over 2,000 ft² * one level of in-rack sprinklers, in the longitudinal flue * at the first tier at or above 10'-0" * maximum spacing of in-racks approximately 10'-0" * eight sprinklers flowing in the calculations * 15 psi each * Per 8.5.6.1, the clearance from the top of the storage to the sprinkler deflector must be at least 18" There are a number of other options, however that's the best I can do with what I read in your post. sincerely, Ken Wagoner, SET Parsley Consulting 350 West 9th Avenue, Suite 206 Escondido, California 92025 Phone 760-745-6181 Visit our website <http://www.parsleyconsulting.com/> On 01/26/2017 1:12 PM, John Paulsen wrote: Afternoon all! I am looking at a Big Box store that is storing furniture on single row racks two levels high in the stock room(s). The spec calls for the use of K-11.2 CMA/D sprinklers and a design density of .45/2,000. This all sounded pretty good to me until I realized that the roof deck was at 15 and the 10x10 head spacing would probably not allow for full development of the spray pattern before it hit the commodity. Plus as I read 17.2.1.4 (4) (2013) the .45 density would require 1 level of in rack sprinklers. My questions are this: Does the commodity storage need to be lowered to 10 and am I right that a single row of in-rack sprinklers are required? Thanks, John Paulsen SET Crown Fire System Design 6282 Seeds Rd. Grove City, OH 43123 P 614-782-2438 F 614-782-2374 C 614-348-8206 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org <mailto:Sprinklerforum@lists.firesprinkler.org> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
_______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
