My pleasure! It woke me up in the middle of the night- but see how nice this is?-- you did not even have to look at the gage to know the drop was just 7 pounds, not 20 :)
-----Original Message----- From: Fletcher, Ron [mailto:[email protected]] Sent: Monday, June 28, 2010 8:37 AM To: [email protected]; [email protected] Subject: RE: Accuracy of Hydrant Flow Test Using Pitot Diffuser Thanks for the idea. I'll save this one. Regards, Ron Fletcher Pre Construction Services [email protected] Aero Automatic Sprinkler Co. 21605 N. Central Avenue Phoenix, AZ 85024 Phone 623-580-7836 Fax 623-434-3420 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Sent: Sunday, June 27, 2010 10:37 AM To: [email protected] Subject: RE: Accuracy of Hydrant Flow Test Using Pitot Diffuser Thanks Ron, very interesting and informative. Here is something else about flow tests I think is interesting, and might come in handy sometime for someone willing to trudge through this: say you're bidding a 4- story Comfort Inn and you need to know the water at least close enough to know 1 res head per room or 2, but all you got on you is the tapped cap w/ gage, the wrench, a 25' tape, and your comb- could you do it? Say static is 60 psi, get a decent stream going, and walk out and drop your comb across from where you think the middle of the splash is. Shut it down. Measure from the hydrant to the comb--- 16'. Measure from the the ground to the center of the butt--- 4'. The time of flight of a droplet straight down from 4' is half a second. The time of flight of a droplet shot straight out from the same height is also half a second (knowing this is the other key to applying velocity pressure correctly in calcs). If the water went 16 feet in .5 sec the velocity is 32 ft/sec x .03 ft^2= about 1 ft^3/sec, about 450 GPM, x .8 for the butt, about 360 GPM. So you got 60 and... dang it! I glanced at the residual when I was shutting down but forgot to remember it. No prob! The velocity head h=v^2/2g is 45 ft x.433= 20 psi----oh yea, the residual gage read 40 psi. -----Original Message----- From: Loren Johnson [mailto:[email protected]] Sent: Saturday, June 26, 2010 12:34 PM To: [email protected] Subject: Re: Accuracy of Hydrant Flow Test Using Pitot Diffuser Ron, could you please send me a copy as well? Thank you. Loren Johnson - CFPS, CET The Hitchcock Co. Peoria, IL --- On Sat, 6/26/10, [email protected] <[email protected]> wrote: > From: [email protected] <[email protected]> > Subject: Re: Accuracy of Hydrant Flow Test Using Pitot Diffuser > To: [email protected] > Date: Saturday, June 26, 2010, 6:47 AM > Ron , please send me a copy. Thanks > > Lamar Vaughn,SET > > > ---- "Fletcher wrote: > > Sometime back there was a thread about flow tests and > the accuracy of > > using diffusers with built in pitot tubes. I had said > that I had an > > article written for the AWWA Journal on the subject. > Some of you had > > asked for a copy of the article which I couldn't find > at the time. I > > found it, it's been scanned and can be sent to anyone > still interested. > > Let me know through PM or the forum and I will forward > a copy. > > > > Ron Fletcher > > Aero Automatic > > Phoenix, AZ > > _______________________________________________ > > 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) _______________________________________________ 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)
