This is a bad idea, pressure relief in lieu of expansion tank? We have a community north of us that have weekend getaway homes that are all sprinklered including the garages and outside canopies where any fuel fired devices are. A lot of these homes are done with antifreeze this in December this area had 2 weeks of single digits to -10, some of the antifreeze systems froze. One contractor installed expansion tanks with pressure relief - they froze. The relief valve did what is was supposed to, however it introduced water into the systems and diluted the mixture. The low end of these homes are $1,000,000 the high end is $10,000,000+, problems like these just add fuel to the fire for our home builder opponents.
Jim Johnston, P.E. Fire Protection Engineer Inland Fire Protection, Inc 1100 Ahtanum Road Yakima, WA 98903 Phone 509-248-4471 Fax 509-248-1180 [email protected] -----Original Message----- From: Thom McMahon [mailto:[email protected]] Sent: Thursday, January 21, 2010 7:56 AM To: [email protected] Subject: RE: Antifreeze Backflow Prevention 2010 NFPA 13 allows the use of a "Pressure Relief valve in lieu of an expansion tank. (I guess the committee got tired of waiting for the price of those expensive expansion tanks to come down, and came up with an alternative.) But if you read 7.6.3.5 carefully all three conditions must be met. Pump, relief and make up. Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Tuesday, January 19, 2010 8:34 PM To: [email protected] Subject: Re: Antifreeze Backflow Prevention but require the expansion tank. eld) _______________________________________________ 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) _______________________________________________ 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)
