You can use a non-hydrant for a flow test. Back to goals. Flow that we pitot is just the way commonly used to measure flow. Would anyone be shocked if direct read flow meters eventually replace pitot gauges?
Yes, you can use gauges on another location. Use a quality gauge that you know the calibration history of. Many of the points you are going to gauge are downstream of a check valve of some type. Domestic meters installed in the last couple decades have a gasketed check valve. At my home the water district replaced the old meter with one the has a check. If you are downstream of a check you should leak water prior to taking initial reading through completion of the test. On a domestic system this will keep the reading consistent with the main (disregarding except for head difference). I've seen temporary connections installed very early in a project to ascertain available flow. We needed to find flow available at 20 psi. Goal was to determine type of construction, per IBC. bv ----- Original Message ----- From: "Matt Grise" <[email protected]> To: [email protected] Sent: Wednesday, June 19, 2013 6:28:15 AM Subject: RE: water test without hydrants Could you flow the line with a 2.5" nozzle and then use the pitot pressure as the residual? Somebody call out if I am wrong - but the pitot is usually lower than the residual, so you know you would be safe. Then you would have the real static, real flow, and a conservatively low "residual". If the flow measures in the 1000 gallon range, then you should still have a usable flow number for your calculations. The pipes will be a little bigger than if you had the real residual pressure, but it could be an option if there is no other way. Matt Grisé PE*, LEED AP, NICET II Sales Engineer Alliance Fire Protection 130 w 9th Ave. North Kansas City, MO 64116 *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 Todd - Work Sent: Wednesday, June 19, 2013 8:15 AM To: [email protected] Subject: Re: water test without hydrants I am looking into hose bibs that are fed from the same main (there is a high and low service in that area). Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com On Jun 19, 2013, at 9:04 AM, Dwight Havens <[email protected]> wrote: > It is a matter of where you want the test to be "effective". If you really > want to know what the public supply can provide, then thestatic and residual > readings need to be taken off of that main. In Phoenix I used to use the > upstream tap on the nearest backflow prevention assembly, but in Phoenix, > these were at the property line, above ground, because we did not worry about > freezing conditions. I have used hose bibs at properties, after ensuring that > there were not check valves between the bib and the water supply. > > Regards, > > Dwight > > > > > ________________________________ > From: Todd - Work <[email protected]> > To: "[email protected]" > <[email protected]> > Sent: Wednesday, June 19, 2013 8:21 AM > Subject: Re: water test without hydrants > > > Wouldn't that be the equivalent of putting the pressure gauge on another > outlet of teh flow hydrant? > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > www.fpdc.com > > On Jun 19, 2013, at 8:08 AM, "Martinez, Dewayne" > <[email protected]> wrote: > >> Couldn't you just put the pressure gauge on the flange connection before >> the hose valve? >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of >> Todd - Work >> Sent: Wednesday, June 19, 2013 6:28 AM >> To: [email protected] >> Subject: water test without hydrants >> >> I have a client who tapped a new 6" line into an 8" public main which >> does not have any hydrants on it. Now we have to get a flow test. My >> thought is to put a flange on the 6" with a 2-1/2" hose valve, to which >> I connect my fire hose and Hose Monster. We would then need to find a >> nearby property tapped off that line and read pressures from that >> system. It seems to make sense, but am I missing something? >> >> Todd G Williams, PE >> Fire Protection Design/Consulting >> Stonington, CT >> www.fpdc.com >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler >> .org >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
