Just one more thing and then I'll quit. "how to estimate the gpm of a flow test by yourself because you've lost the pitot that came with the kit, and there are no formulas in the standards or aps for that"
t = SQRT (2h/g) where t is the 'time of flight' in seconds and h is the height of the butt in feet. Say h = 4ft. t=(8/32)^.5=.5 sec. Say the length of the stream is 20 ft. If the water went 20 ft in .5 sec it is going 40 ft/sec. A 2.5" C=.9 butt is .0307 ft^2, * 40 ft/sec=1.228 ft^3/sec, *7.48*60= 551 GPM. No one in their right mind would avocate basing final calcs on this. So it's an open question as to wether or not I would. . . ;) Brad On Oct 1, 2016 4:30 PM, "Brad Casterline" <[email protected]> wrote: > Thanks Trevor. > I like graphs. I'm a slow learner but i dont let that stop me. > On Oct 1, 2016 4:11 PM, "Brad Casterline" <[email protected]> wrote: > >> Wow Ron thanks! >> That pow thing blows my mind but that's ok. >> I might seem overly sensatitve about this but it is one of the two or >> three 'light bulb' moments I've had in my sprinkler career. I don't know if >> you have heard designers say things like, "suddenly it just clicked", or >> not. I have, but I guess I'm the only one who heard gravity click with >> sprinkler calcs. Before that Q,K,P was so mysterious, although I could >> sleep at night, it was fitfull. >> >> Thanks again man, >> >> Brad >> On Oct 1, 2016 3:54 PM, "rongreenman ." <[email protected]> wrote: >> >>> Brad- >>> >>> 919gpm using the standard formula by hand. The only trick is the square >>> root of P which may have to be bracketed if it's not one you know. I can >>> use a simple calculator for that though. Took about 45 seconds with a >>> calculator with a square root function. A couple of minutes if i need to >>> bracket and less than the 45 seconds if its a square root I know (like for >>> 30). >>> >>> And here is the calculator tape for the truly annal: >>> >>> pow(30,1/2) * 6.25 * 0.9 * 29.83 >>> = 919.04421883382455 >>> >>> 2.5 squared is just one of those I have memorized. >>> >>> On Sat, Oct 1, 2016 at 1:35 PM, Trevor Spain <[email protected]> >>> wrote: >>> >>>> If you need to be able to print a report or save a report as a pdf, >>>> download the free hydrant flow test program from here: >>>> >>>> http://igneusinc.com/files/files.html >>>> >>>> Trevor Spain >>>> >>>> >>>> On 10/1/2016 2:03 PM, Mark Phillips wrote: >>>> >>>>> http://www.firehydrant.org/info/hycalc.html >>>>> >>>>> Love it and used it for years >>>>> >>>>> >>>>> Sent from my Verizon 4G LTE Droid >>>>> On Oct 1, 2016 2:52 PM, Travis Mack <[email protected]> wrote: >>>>> Follow the formula in the standards. >>>>> >>>>> 29.83 x hydrant coefficient x pumper modification x diameter x >>>>> diameter x sqrt (pitot pressure) >>>>> >>>>> Keep it all simple. No need to overcomplicate everything. >>>>> >>>>> There are even several apps to put in your phone to do this stuff. >>>>> Keep it all simple. >>>>> >>>>> Travis Mack, SET >>>>> MFP Design, LLC >>>>> "Follow" us on Facebook: https://www.facebook.com/pages >>>>> /MFP-Design-LLC/92218417692 >>>>> Send large files to MFP Design via: >>>>> https://www.hightail.com/u/MFPDesign >>>>> >>>>> Sent from my iPhone >>>>> >>>>> On Oct 1, 2016, at 11:35 AM, Brad Casterline <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> >>>>> My pleasure Jeff, thanks for saying. >>>>> >>>>> On Oct 1, 2016 1:32 PM, "Jeff Normand" <[email protected]<mailto: >>>>> [email protected]>> wrote: >>>>> Thanks for sharing Brad. >>>>> >>>>> On Sat, Oct 1, 2016 at 1:28 PM, Brad Casterline < >>>>> [email protected]<mailto:[email protected]>> wrote: >>>>> >>>>> Say it's a 2.5" butt (small, smooth and well rounded my personal >>>>> favorite) so C=.9. >>>>> >>>>> ((2.5/24) ^2) * PI = .034 ft^2. >>>>> .034 * .9 = .0307 ft^2. >>>>> >>>>> Say pitot = 30 PSI. >>>>> 30/.433=69.284 ft (h). >>>>> v=(2gh)^.5=(2*32.2*69.284)^.5=69.8 ft/sec. >>>>> .0307 ft^2 * 69.8 ft/sec = 2.05 ft^3/sec, * 7.48 * 60 = 920 GPM. >>>>> >>>>> That's not too shabby! >>>>> >>>>> Brad >>>>> >>>>> _______________________________________________ >>>>> Sprinklerforum mailing list >>>>> [email protected]<mailto:Sprinklerforum >>>>> @lists.firesprinkler.org> >>>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>>>> iresprinkler.org >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Sprinklerforum mailing list >>>>> [email protected]<mailto:Sprinklerforum >>>>> @lists.firesprinkler.org> >>>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>>>> iresprinkler.org >>>>> >>>>> _______________________________________________ >>>>> Sprinklerforum mailing list >>>>> [email protected]<mailto:Sprinklerforum >>>>> @lists.firesprinkler.org> >>>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>>>> iresprinkler.org >>>>> _______________________________________________ >>>>> Sprinklerforum mailing list >>>>> [email protected] >>>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>>>> iresprinkler.org >>>>> >>>>> >>>>> >>>> _______________________________________________ >>>> Sprinklerforum mailing list >>>> [email protected] >>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>>> iresprinkler.org >>>> >>> >>> >>> >>> -- >>> Ron Greenman >>> >>> 4110 Olson Dr., NW >>> Gig Harbor, WA 98335 >>> >>> [email protected] >>> >>> 253.576.9700 >>> >>> The Universe is monstrously indifferent to the presence of man. -Werner >>> Herzog, screenwriter, film director, author, actor and opera >>> director (1942-) >>> >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>> iresprinkler.org >>> >>>
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