I think this would be the most accurate solution to the problem.You can also test the backflow device at the same time.
LV ---- Dewayne Martinez <[email protected]> wrote: > 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) _______________________________________________ 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)
