Only the sprinklers are 175, everything else is 250-300. Ron F -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Cahill, Christopher Sent: Tuesday, February 18, 2014 1:42 PM To: [email protected] Subject: RE: Static Pressure/Working Pressure
I revise my comments just a bit now understanding the discharge is OK it's something below discharge that is over 175. But same points though, whatever is over 175 if listed then OK. If talking about firefighter standpipe valves the FD can accept the 3 psi. I would if I were the FD. PRV's have killed firefighters. But I'd still want the higher pressure listed valves/pipe/fittings/sprinklers....so it doesn't break (and yes I get the difference in probability of 178 vs. 175 and something breaking is negligible). Chris -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, February 18, 2014 2:33 PM To: [email protected] Subject: RE: Static Pressure/Working Pressure The valves are below the pump discharge. The churn at the pump discharge is less than 175. Ron F -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Pete Schwab Sent: Tuesday, February 18, 2014 1:20 PM To: [email protected] Subject: RE: Static Pressure/Working Pressure What is the elevation of the first floor hose valves in relation to the discharge flange of the fire pump? Peter Schwab VP of Purchasing & Engineering Technologies Wayne Automatic Fire Sprinklers Inc. 222 Capitol Court Ocoee, Fl 34761 Mobile: (407) 468-8248 Direct: (407) 877-5570 Fax: (407) 656-8026 www.waynefire.com Celebrating over 34 years of life safety -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, February 18, 2014 2:50 PM To: [email protected] Subject: Static Pressure/Working Pressure 3.8.1.9.2 Static Pressure. The pressure that exists at a given point under normal distribution system conditions measured ... We have a project with an electric pump and when combined with the current water supply the churn pressure is 178 psi. A nationally known engineering firm wants us to install PRV's on the lowest level of the building because of the 3 psi. Our position is that the pressure only exists at churn and that is similar to an overnight pressure surge in a municipal water system. The over pressure will be compensated for by the pressure relief valves once the pump stops. Are we being overly loose with our interpretation of "normal" or is the engineering firm correct? Ron F _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
