Apples and oranges. Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected]
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Thursday, May 31, 2012 3:40 PM To: [email protected] Subject: RE: dry-pipe with in-rack/ceiling protection of Class IV to > 25 ft in open racks we have an example of increasing number of heads with attic heads: 5 for wet and 7 for dry -----Original Message----- From: Brad Casterline [mailto:[email protected]] Sent: Thursday, May 31, 2012 1:26 PM To: [email protected]; [email protected] Subject: RE: dry-pipe with in-rack/ceiling protection of Class IV to > 25 ft in open racks 30% more sprinkler water required due to the fire being 30% bigger due to time delay? -----Original Message----- From: ParsleyConsulting [mailto:[email protected]] Sent: Thursday, May 31, 2012 1:19 PM To: [email protected] Subject: Re: dry-pipe with in-rack/ceiling protection of Class IV to > 25 ft in open racks Scott, I think Scot Deal raised an interesting question. He's correct in the increase in area of 30%, per 12.5.1, but the question remains, if we have in-rack sprinklers, do we increase the number of them flowing in a dry system calculation? If so, why? If not, why not? The table Scot referenced doesn't allow the use of CMDA sprinklers without in-racks as well, so what do we do about the number flowing in the calc? Anyone have input on the answer? PARSLEY CONSULTING Ken Wagoner, SET 760.745.6181 voice 760.745.0537 fax [email protected] <mailto:[email protected]>e-mail www.ParsleyConsulting.com <http://www.ParsleyConsulting.com>website On 5/31/2012 10:13 AM, Scott A Futrell wrote: > Scot, > > I don't see anything that sends you back to 11.2.3.2.5 to increase the in-rack design requirement by 30%. 11.2.3.2.5 is an area of sprinkler operation increase, not a number of design sprinklers increase. Intuitively, yes. Prescriptive, no. > > Scott Futrell > > (763) 425-1001 x 12 Office > (612) 759-5556 Cell > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of å... .... > Sent: Thursday, May 31, 2012 11:50 AM > To: [email protected] > Subject: dry-pipe with in-rack/ceiling protection of Class IV to> 25 ft in open racks > > 2010 NFPA 13 > > When one uses dry-pipe with combination in-rack/ceiling sprinklers to protect Class IV to greater than 25 ft per Table 16.3.1.1, the 30% increase applies to both in-rack and overhead sprinklers, yes? > > scot deal > excelsior fire > -------------- next part -------------- > An HTML attachment was scrubbed... > URL:<http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attach ments/20120601/1810b32c/attachment.html> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
