Thanks, I will look into the cut sheet. The fitter preformed an alarm test so only a small amount of water was flown.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Pinigis Sent: Friday, May 09, 2008 1:22 PM To: sprinklerforum@firesprinkler.org Subject: RE: Change in static pressure Look at the cut sheet on the BFP. Some BFPs require a significant amount of pressure to open at very low flows. For example, an 12" Ames 2000SS requires almost 6 psi to operate at very low flow so it can sit there all day with an upstream pressure nearly 6 psi higher than the system side pressure. Paul J. Pinigis, P.E. Chief Life Safety Engineer -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Friday, May 09, 2008 1:55 PM To: sprinklerforum@firesprinkler.org Subject: Change in static pressure I have a job site which is 10ft higher than the water supply. A gauge on the water supply hydrant reads 55 PSI static pressure while two gauges on the system riser after the BFP read 37 PSI? The total elevation change between the system gauges and the supply gauge is about 17ft. Why would there be a 18 PSI difference between the gauges when elevation only accounts for 7.36 PSI? I confirmed with the city that there are no shut valves. Any thoughts? Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org 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 Sprinklerforum@firesprinkler.org 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 Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
