By the way, I also looked at the activation time diff between 155F SR and 200F QR, using the same model Dr. Floyd used for the Cloud Ceiling Study. At 10 ft ceiling height, the SR wins by a few seconds!
> On Apr 20, 2014, at 10:41 AM, Brad Casterline <[email protected]> wrote: > > Mike, > From the current available tools to predict activation times, and my current > "guess" at what LOW from NFPA 13, 5.2 is, I think the activation time > difference between a 155F QR and a 200F QR is about 6 seconds per foot of > ceiling height. I looked at 10 through 20 foot clg hgt, so at 10 ft the diff > is 6 sec, at 12-6 the diff is 15 sec, etc, so I appreciate the fact that temp > is not one of the 4 criteria for QR Reduction. I try not to predict the > outcome of modeling calcs ( bcoz I usually get it bassakwards), but I would > think with a 2'-6" ceiling height Ord thru High Temp, SR or QR, would provide > a reasonable degree of protection. But being NICET certified means we don't > have to think, we just have to do it by the book, which I also appreciate! > > brad > >> On Apr 19, 2014, at 4:30 PM, Brad Casterline <[email protected]> wrote: >> >> It sure would be nice if the book said something like "for 30" tall attics, >> stub some dry uprights up in there at about 10x10 spacing, at about 15" >> deflector, and tell the concealed space Marketeers to have a nice day :) >> >>> On Apr 19, 2014, at 4:14 PM, Travis Mack <[email protected]> wrote: >>> >>> 30" deep may require the use of specially listed concealed space sprinklers >>> if it is a roof with slope of less than 2:12. >>> >>> But to your original question, temp does not negate the use of the qr >>> reduction. >>> >>> Travis Mack, SET >>> MFP Design, LLC >>> >>> Sent from my iPhone >>> >>>> On Apr 19, 2014, at 1:53 PM, <[email protected]> wrote: >>>> >>>> Brad, >>>> >>>> That was my thought also. >>>> >>>> >>>> Mike Bell >>>> Senior Designer, S.E.T. Lvl IV >>>> Aero Automatic Sprinkler Company >>>> 21605 N Central Ave >>>> Phoenix AZ 85024 >>>> PH: (623) 580-7848 >>>> FX: (623) 580-5230 >>>> Mobile: (623) 229-4980 >>>> [email protected] >>>> >>>> >>>> >>>> >>>> -----Original Message----- >>>> From: [email protected] >>>> [mailto:[email protected]] On Behalf Of Brad >>>> Casterline >>>> Sent: Saturday, April 19, 2014 1:47 PM >>>> To: [email protected] >>>> Subject: Re: Intermediate Q.R. Sprinklers >>>> >>>> No, there are 4 criteria to meet, and temp is not one. >>>> >>>>> On Apr 19, 2014, at 3:43 PM, <[email protected]> wrote: >>>>> >>>>> Does the use of a 200deg Q.R. sprinkler negate the Design Area Reduction >>>>> for the remote area? >>>>> I am calculating an unused attic of a school trailer approximately 2'-6" >>>>> deep. Heads above & below with the greater number of sprinklers in the >>>>> attic area. >>>>> >>>>> Mike B >>>>> Aero Fire >>>>> _______________________________________________ >>>>> Sprinklerforum mailing list >>>>> [email protected] >>>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >>>> _______________________________________________ >>>> Sprinklerforum mailing list >>>> [email protected] >>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >>>> >>>> >>>> _______________________________________________ >>>> Sprinklerforum mailing list >>>> [email protected] >>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
