The UG supply line is 6" plastic water pipe coming off a 10in main in the street. I thought maybe the new 6" is obstructed somehow but that should have showed up during the UG flush. There is a new hydrant on the 6in lead in and a wall hydrant on the backside of the building. What does the forum think about putting the gauge on the hydrant and flowing the wall hydrant out the back side of the building for the flow? This would eliminate the water utilities concerns about "icing" the street and I would only have to be concerned about the owners landscaping.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matt Grise Sent: Monday, December 14, 2009 10:51 AM To: '[email protected]' Subject: RE: forward flow test problem What is the underground supply line to the system riser like? Could it be causing extra pressure loss? 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:[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:[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)
