Seems odd as it should be filled with water before a single head fuses so it should act like a wet, but if the detection fails to trip the valve no number of heads opening will make it act like a dry. It would have deterioration characteristics similar to dry sitting around with wet air in it all day so the 100C would make sense, but....
On Mon, Mar 31, 2014 at 1:59 PM, <[email protected]> wrote: > Not in the 1979 edition of NFPA 231 which is what is applicable to my > project for the original design. So the exception was not present in the > Storage standard in 1979 and didn't make it to NFPA 13 until 1999. That > makes it irrelevant for the original design. > > It is not applicable based on current NFPA 13 either, so it is what it is, > a dry system by definition. > > > > Craig L. Prahl, CET > Fire Protection Group Lead > CH2MHILL > Lockwood Greene > 1500 International Drive > Spartanburg, SC 29303 > Direct - 864.599.4102 > Fax - 864.599.8439 > CH2MHILL Extension 74102 > [email protected] > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of rongreenman . > Sent: Monday, March 31, 2014 4:41 PM > To: [email protected] > Subject: Re: Single interlock PA equal to Wet > > If it wasn't editions previous to 1999 could it have been in a 231 series > document since that's the year when 231 and 231C were folded into 13? > > > On Mon, Mar 31, 2014 at 1:32 PM, <[email protected]> wrote: > > > Thanks Bob, > > > > I kept digging, found this verbiage in 1999 NFPA 13, 7-4.1.5.3 > > Located in the Rack Storage Section. It was also applicable for areas > > that are highly susceptible to water damage. > > > > "Where preaction systems are used, preaction systems shall be treated > > as dry pipe systems. > > > > Exception: This requirement shall not apply where it can be > > demonstrated that the detection system that activates the preaction > > system causes water to be discharged from sprinklers as quickly as the > > discharge from a wet pipe system." > > > > This was new for 1999. So that answers two questions, this was not in > > force in 1982 and what's there now doesn't have a snowball's chance of > > working correctly. I can duplicate the original design if I calc it > > using > > C-120 for a wet system, if you use C-100 for black steel, dry system > > as it actually exists, the system is non-functional. > > > > > > NFPA 13, 2010 has removed this statement from all areas within where > > it used to reside. > > > > Oh the fun of it all. > > > > Craig L. Prahl, CET > > Fire Protection Group Lead > > CH2MHILL > > Lockwood Greene > > 1500 International Drive > > Spartanburg, SC 29303 > > Direct - 864.599.4102 > > Fax - 864.599.8439 > > CH2MHILL Extension 74102 > > [email protected] > > > > > > > > -----Original Message----- > > From: [email protected] [mailto: > > [email protected]] On Behalf Of Bob > > Sent: Monday, March 31, 2014 4:22 PM > > To: [email protected] > > Subject: RE: Single interlock PA equal to Wet > > > > 2002 ed, 12.2.3.2.2.5 (B) > > > > Thank You, > > > > Bob Knight, CET III > > 208-318-3057 > > www.Firebyknight.com > > > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of > > [email protected] > > Sent: Monday, March 31, 2014 2:03 PM > > To: [email protected] > > Subject: Single interlock PA equal to Wet > > > > At some point in time I thought I had seen a blurb in NFPA 13 which > > stated that for some certain design conditions a single interlock > > preaction system was considered the same as a wet pipe system. The > > rationale behind the premise being that the system piping would be > > charged prior to activation of sprinklers. Trying to look for a > > similar statement in NFPA 13 2010, and not just finding it. > > > > Anyone recall this in prior or the 2010 edition? > > > > > > Craig L. Prahl, CET > > Fire Protection Group Lead > > CH2MHILL > > Lockwood Greene > > 1500 International Drive > > Spartanburg, SC 29303 > > Direct - 864.599.4102 > > Fax - 864.599.8439 > > CH2MHILL Extension 74102 > > [email protected] > > > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > > er.org > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > > er.org _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > > er.org > > > > > > -- > Ron Greenman > Instructor > Fire Protection Engineering Technology > Bates Technical College > 1101 So. Yakima Ave. > Tacoma, WA 98405 > > [email protected] > > http://www.bates.ctc.edu/fireprotection/ > > 253.680.7346 > 253.576.9700 (cell) > > Member: > ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC > > They are happy men whose natures sort with their vocations. -Francis > Bacon, essayist, philosopher, and statesman (1561-1626) > > A problem well stated is a problem half solved. -Charles F. Kettering, > inventor and engineer (1876-1958) > _______________________________________________ > 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 > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
