Ladies/Gentlemen: The last time I checked, all new sprinklers manufactured at U.S. plants are "shock-tested" to a minimum of 500 psi - one heckuva water 'hammer'. In my humble opinion, I do believe something else (overhead pipe/fittings, underground, FDC, etc.) would give out before a pressure 'surge' would cause a sprinkler head to activate. In 40 years - and many "accidental" activation cases later - I've never seen it happen...Heard secondhand, but never actually been able to verify it happened. Just my 1.5 cents, adjusted for deflation. Regards to All- Jerry* [email protected]_ (mailto:[email protected]) Jerry D. Watts, SFPE President & Co-Founder ACCENT FIRE ENGINEERING INT'L. Ltd. Santa Fe, New Mexico USA (800) 503.1961 nationwide *NM Sprinkler Journeyman Lic. #08228 In a message dated 8/6/2014 2:26:58 P.M. Mountain Daylight Time, [email protected] writes:
If it were due to a pressure spike than only one head opening might not be unusual as the over pressure would be immediately relieved, but an unlikely event nevertheless. Particularly multiple times unless a batch of bad sprinklers. Think of pieces of pipe cut from a single pipe with a bad seam. Then again when the forklift guy hits the sprinkler it usually is an accident. On Wed, Aug 6, 2014 at 9:28 AM, Steve Leyton <[email protected]> wrote: > Actually sprinklers (and most UL-listed equipment) are required to be > pressure tested at 4x rated, so that would be 700 PSI for conventional > sprinklers and 1000 PSI for HP. > > SL > > > > > > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of > [email protected] > Sent: Wednesday, August 06, 2014 9:08 AM > To: [email protected] > Subject: RE: Excessive system pressure and opening of sprinklers > > Check the UL listing requirements, I believe the sprinkler heads are > pressure tested at 500 PSI. > Mark at Aero > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of > [email protected] > Sent: Wednesday, August 06, 2014 9:05 AM > To: [email protected] > Subject: Excessive system pressure and opening of sprinklers > > Got a client that has had more than one incident of "accidental" sprinkler > discharge they claim is due to municipal pressure surges. Static pressure > on this industrial system is 150 psi, and a surge tank was installed a > couple of years back to mitigate alleged pressure spikes. > > Anyone heard of sprinklers opening due to a pressure spike? > > It was only one head out of multiple hundreds in the building. > > Craig L. Prahl > 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-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerfo rum-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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
