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: [email protected] [mailto:[email protected]] On Behalf Of Joel Chaim Sent: Wednesday, October 26, 2011 2:13 PM To: [email protected] 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 [email protected] 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 [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
