What type of nozzles does the local fire department use, and what pressure would they want on the tip? Size and length of the hose line on their standpipe packs? A.Steele
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Tom Duross Sent: Tuesday, September 01, 2015 8:28 AM To: [email protected] Subject: RE: PRV on Standpipe Calcs Why not just use field set valves? TD Pick a valve, use the manufacturer's curves. You can calculate the point at which you need valves - high static + churn. Steve Anyone have a good reference on calculating PRV setting on a combined standpipe. It's been 20 years since I've had to do one. I downloaded some directions from Hydratec, now I'm more confused than ever. I'm going to give them a call in the AM to see if they can give some additional guidance. Here are the system stats. City static 85, residual 41 @ 1350. Pump is 750gpm @ 105. Pump churn (off pump curve) 121 psi. Combined static + churn = 206. Building is 6 stories + partial basement. pump is in basement. Pump discharge to highest outlet = 85'. Based on static pressure alone I figure the first 4 floors will need PRV's on both the system and the hose valves. Where I am hung up is how to determine the pressure settings for the system PRV's. Richard Mote Designer Rowe Sprinkler Systems, Inc. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler .org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
