I just had him install the extra gauge before the BFP to eliminate any loss from through the BFP for the test reading. We still have the gauge located on the system riser per NFPA.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of G. Tim Stone Sent: Monday, December 14, 2009 11:00 AM To: [email protected] Subject: RE: forward flow test problem Dewayne, Are you getting a false lower PSI reading due to the location of the pressure gage? Refer to 2002 ed. (Fig. A.8.15.2.4) Unacceptable pressure gage location. G. Tim Stone NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 TEL: (802) 434-2968 Fax: (802) 434-4343 [email protected] > -----Original Message----- > From: [email protected] [mailto:sprinklerforum- > [email protected]] On Behalf Of Matt Grise > Sent: Monday, December 14, 2009 11:49 AM > To: '[email protected]' > Subject: RE: forward flow test problem > > Are there any major users in the area? > > Matt Grisé PE*, LEED AP > Sales Engineer > Alliance Fire Protection > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > -----Original Message----- > From: [email protected] [mailto:sprinklerforum- > [email protected]] On Behalf Of Dewayne Martinez > Sent: Monday, December 14, 2009 10:46 AM > To: [email protected] > Subject: forward flow test problem > > We have a job where the residual pressure recorded during the backflow > test is lower than expected. The hydrant used for the original water > test is about 10ft lower than the system riser and has a flow test > result of 72PSI static, 62PSI residual, flowing 902GPM (off a > circulating system). I had my fitter install a pressure gauge before > the 1st check on the BFP and the we recorded a static of 67PSI but a > residual of 50PSI at a flow of 715GPM. I confirmed with the water > utility that the gate valve for the water lead in is fully open and > that > no pumps or valves have been shut off for water main breaks or > maintenance. Unfortunately, they will not run a new flow test in > winter. > Any ideas as to what is causing the low residual pressure? > Thanks, > Dewayne Martinez > Design Build Fire Protection > New Berlin, WI > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:Sprinklerforum- > [email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:Sprinklerforum- > [email protected] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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)
