So Ken, I'll ask you too, What GPM do you come up with? On Oct 1, 2016 2:28 PM, "Parsley Consulting" <[email protected]> wrote:
> Travis, > that's the most worthwhile advice I've read on this forum in some > time. Just keep it as simple as possible. The more complex one makes the > math the greater the opportunity for a digit, a decimal, a square, a square > root, take your pick, to applied incorrectly, and thus skew the results to > where they're no longer relevant. > > Look at equation 4.9.3 in -291. It's exactly the same equation you > quoted. Very simple. > > 29.84 * c * d² * √p > > > Of course, I suppose the charts in -291 could be helpful if you didn't > need the results calculated out to tenths of a gallon. They're all the > result of the same equation with a C = 1.00 so converting to a different > hydrant outlet coefficient is relatively easy. > > See disclaimer below. > sincerely, > > *Ken Wagoner, SET Parsley Consulting* > > > > > > > > > * 350 West 9th Avenue, Suite 206 Escondido, California 92025 Phone > 760-745-6181 <760-745-6181> Visit our website > <http://www.parsleyconsulting.com/> IMPORTANT NOTICE: This correspondence > is not a Formal Interpretation issued pursuant to NFPA Regulations. Any > opinion expressed is the personal opinion of the author and does not > necessarily represent the official position of the NFPA or its Technical > Committees. In addition, this correspondence is neither intended, nor > should it be relied upon, to provide professional consultation or services > It should be noted that the above is my opinion as a member of the NFPA > Installation of Private Fire Service Mains and their Appurtenances > Committee in accordance with the NFPA Regulations Governing Committee > Projects and should therefore not be considered, nor relied upon, as the > official position of the NFPA or its Committees * > > > On 10/01/2016 11:51 AM, Travis Mack 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]> > wrote: > > My pleasure Jeff, thanks for saying. > On Oct 1, 2016 1:32 PM, "Jeff Normand" <[email protected]> wrote: > >> Thanks for sharing Brad. >> >> On Sat, Oct 1, 2016 at 1:28 PM, Brad Casterline <[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] >>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-f >>> iresprinkler.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 > [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 > >
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