I hate to further complicate an already-complicated situation, but why not take the pump rating down to where you don't need the PRV? Are you confident that this valve will receive the regular inspections AND TESTING required to assure its functionality when called upon? And don't forget that the available listed reducing valves are all rated at 165 PSI max., not 175.
Additionally, if a pumper hits an FDC at 150 PSI and you have 165-175 already on the system, it's going to have little initial effect except to confuse the fire department. This one will need a sign telling the FD to pump at 175, but you'll be exposing everything downstream to pressure packing, including the building systems (all equipped with relief valves, right?) I dunno - I think FDC's on the sprinkler laterals are a better idea unless they specifically view the loop as a standpipe system. In which case I would dial that pump down ... Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Tuesday, September 23, 2008 12:54 PM To: [email protected] Subject: RE: UG FIRE LOOP - pumper connection We have a pressure reducing valve down stream from the fire pump so it is basically a flat 175PSI curve. The fire truck will draw from the same 12" supply. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Arthur Tiroly Sent: Tuesday, September 23, 2008 2:34 PM To: [email protected] Subject: RE: UG FIRE LOOP - pumper connection What are the system pressures from the fire pump churn and rated psi? Will the fire truck draw from the same 12" water supply? The fire pump may shut down if the pumper provides adequate pressure. Fore severe demand use the UL fire pump may exceed the truck's ability to maintain flow and pressure. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Tuesday, September 23, 2008 3:18 PM To: [email protected] Subject: UG FIRE LOOP - pumper connection I have a job which has a 2000GPM fire pump supplied by a 12" city main. The pump in turn feeds a 10" UG fire loop that runs around the building. The FDC connection is located away from the building and connects to the 10" fire loop. A fire hydrant supplied from the municipal water supply is located next to the FDC. So the pumper truck will hook up to the municipal hydrant and pump into the FDC for the UG loop. Do you see any potential problems with a pumper truck, rated for 1700 GPM, pumping into a fire loop supplied by a 2000GPM fire pump? Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) __________ Information from ESET NOD32 Antivirus, version of virus signature database 3466 (20080923) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3466 (20080923) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
