You are correct. There needs to be backflow protection between the public/domestic supply and the sprinkler system, and also between the wet system and the antifreeze loop.
Matt Grisé PE*, LEED AP Sales Engineer Alliance Fire Protection *Licensed in KS & MO 913.888.0647 ph 913.888.0618 f 913.927.0222 cell www. AFPsprink.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Kettler Sent: Thursday, January 21, 2010 10:24 AM To: [email protected] Subject: RE: Antifreeze Backflow Prevention Thanks! Found it now. We rarely see anti-freeze loops and I was happy to see this one. We typically see complete anti-freeze systems. So as I read this - the "drilled out" check valve is required for expansion. If we use a back flow preventer in lieu of check valve, then we will see the expansion tank? And these check valves and back flow preventers are specifically on the anti-freeze loop - not ones that might be required (NOT drilled out) between the sprinkler system and domestic water? Jim K. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matt Grise Sent: Thursday, January 21, 2010 11:09 AM To: '[email protected]' Subject: RE: Antifreeze Backflow Prevention That is one of the conditions required to use the loop/check valve. Matt Grisé PE*, LEED AP Sales Engineer Alliance Fire Protection *Licensed in KS & MO 913.888.0647 ph 913.888.0618 f 913.927.0222 cell www. AFPsprink.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Kettler Sent: Thursday, January 21, 2010 10:08 AM To: [email protected] Subject: RE: Antifreeze Backflow Prevention I had an expansion tank/anti-freeze issue just this AM. Residential 13D system (pump & tank) with an anti-freeze loop, but no expansion tank. When I asked, I was told that they "drilled a 1/16th inch hole in the check valve on the anti-freeze loop which is the same as having the tank." Really???? I've seen some strange things, but this was a first. James M. Kettler, EFO, CFPS Director of Building and Codes/Fire Marshal Buckingham Township PO Box 413 4613 Hughesian Drive Buckingham, PA 18912 215-794-8836 www.buckinghampa.org _______________________________________________ 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) _______________________________________________ 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)
