The first thing you have to do is find listed anti-freeze. Good luck. The rest is mood point if you are following the 2013 or newer NFPA 13 (7.6.2)
Duane T. Fox, Jr., CFPS, CFI, CFPE Asst Chief, Technical Services DE State Fire Marshal’s Office 302-856-5298 From: Sprinklerforum [mailto:[email protected]] On Behalf Of Dale Wingard Sent: Monday, January 30, 2017 9:44 AM To: [email protected] Subject: Re: Check valves on Antifreeze loops First, the loop requires a Reduced Pressure Backflow. Are you using the check valves to separate the two canopies? Sent from my Verizon Wireless 4G LTE DROID Douglas Hicks <[email protected]<mailto:[email protected]>> wrote: We have a building with 2 outside canopies, each is protected by an antifreeze loop. The sprinkler system has a backflow in a pit. Do each of the 2 antifreeze loops need a one way swing check valve, with a hole in the clapper? I will put a test port at each end of both loops, even though the loops are not 150 gallons.
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