and what about a 200 psi hydro for 2 hours---? that's not "normal" :)
-----Original Message----- From: Brad Casterline [mailto:[email protected]] Sent: Tuesday, February 18, 2014 2:20 PM To: [email protected] Subject: RE: Static Pressure/Working Pressure Ron, At what elevation is the 178? If it is at the discharge gage, you would be at Pn=175 at 6.93 feet above it. Sorry, I know you asked about interpretation of a different normal pressure, and I think "churn" is not normal, as you say. But I'm not a P.E. or A.H.J. brad -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Tuesday, February 18, 2014 1:50 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
