If I have stable temperatures, like in a small freezer box, do I still need an expansion tank/pressure relief on an AF system?
Re thinking this (and yes I see the new PRV option in '10) if the temperatures are stable within a few degrees and I have a heated space outside the freezer and the freezer is kept at whatever there is really no changes that will cause a pressure change once the system is charged. Any nominal fluctuations in temperature would be easily absorbed by the air trapped in the piping. I only see in 13 'shall' have. Now I assume 99% of AF is in spaces that rise and fall with outside air temperature changes so on that basis the shall makes sense. I also find it humorous Fire-X-Trol's charts are based on a temp variation of 100 deg. and 70% PG. Seriously, where exactly is this in the US, Key West, Hawaii, San Diego? Isn't a vast majority of the US more than 100? We'd be close to 170 here in outside/attic applications with closer to 50%. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
