If your over pressure condition is strictly at churn and your hydraulic demand is less than 175 psi at flow I would suggest a pump with a PLD. They really work and are the best (I think) solution when dealing with a steep supply curve or mandatory pressure reductions imposed by the local AHJ. The added cost to a diesel pump is pretty reasonable too.
Ron Fletcher Aero Automatic Phoenix, AZ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Wednesday, July 09, 2008 9:07 AM To: [email protected] Subject: Pressure reducing valve location for a fire pump I have to install a pressure reducing valve on the discharge side of the fire pump. I know from past discussions that if standpipes are present, the valve must be installed after the last control valve for the fire pump to satisfy NFPA 14. What if this is a large warehouse falling strictly under 13? Could it be placed between the pump discharge and check valve (just like pressure relief valve on a diesel FP) and sized per minimum relief valve in 2-20 (NFPA 20 99ed)? I have a 2000gpm pump with a 8" discharge flange and would like to get a 8" pressure reducing valve to work instead of a 10in (size required for discharge pipe) to save some money. I checked the spec sheets and the 8" valve can handle the flow at 150%. Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
