It is my understanding that the purpose of the chamber is to prevent excessive pressure which can result in pipe damage, is it possible when you have 60 psi in a sprinkler system that thermal expansion will increase the pressure to above 175 PSI?
-----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of John O'Connor Sent: Wednesday, October 26, 2011 3:26 PM To: sprinklerforum@firesprinkler.org Subject: RE: Expansion chamber for anti-freeze In a water or antifreeze filled wet system (in service long enough to completely absorb all air) and the common practice of using backflow preventers, a system subjected to high temperature swings will could experience high pressures that cannot be dissipated thru a 1/32" hole in a clapper of the check valve. Hence escalating pressures and no way to vent same. Pressure chamber does the trick. John O'Connor Nashville TN -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Joel Chaim Sent: Wednesday, October 26, 2011 2:13 PM To: sprinklerforum@firesprinkler.org Subject: Expansion chamber for anti-freeze Can anybody explain why I would need an expansion chamber for an anti-freeze system when there is only 60 psi in the street? NFPA does not make a difference for low street pressure. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachment s/20111026/53edf952/attachment.html> _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1411 / Virus Database: 2092/3975 - Release Date: 10/26/11 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
