5 gallon bucket and a stop watch Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 www.fpdc.com
> On Jun 20, 2014, at 11:45 AM, "Brad Casterline" <[email protected]> > wrote: > > Whaaaa...? Where has 291 been all my life?!? > I think I'll propose adding that if one has neither a gage OR a pitot, how > to do it with a comb and a ruler. > > -----Original Message----- > From: Parsley Consulting [mailto:[email protected]] > Sent: Friday, June 20, 2014 10:20 AM > To: [email protected] > Subject: Re: to Pitot or not to Pitot? > > Roland, > Excellent description of what the intent of -291 describes in > section 4.9. As our mutual friend Joe Hankins used to say "Don't > measure with a micrometer when you're going to cut with a chainsaw." > *Ken Wagoner, SET > *Parsley Consulting*** > *350 West 9th Avenue, Suite 206 > *Escondido, CA 92025-5053 > *****Phone 760.745.6181* > Visit our website <http://www.parsleyconsulting.com/> *** >> On 6/20/2014 8:04 AM, Roland Huggins wrote: >> NFPA 291 says use a Pitot but IF a pitot is not available then a butt > gauge will provide APPROXIMATELY the same results. Unless one broke the > bloody thing, if one doesn't have a pitot I suspect they shouldn't be out > there. Nonetheless, the velocity pressure in the discharge stream equals > 100% of the pressure whereas the gauge pressure is just the normal pressure > (that being total pressure minus velocity pressure) prior to the water > outlet but it shouldn't be seeing the pressure loss associated with the > water going through the outlet. Since the pitot reading is recommended to > limit the velocity (not exceeding 30 psi on the pitot), it may not be a lot > of difference. Combining this with the exacting precision associated with > many pitot readings, it could be the TC felt it was close enough (like using > hand grenades). >> >> Roland >> >> >> Roland Huggins, PE - VP Engineering >> American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives >> Dallas, TX >> http://www.firesprinkler.org >> >> >> >> >> >> On Jun 20, 2014, at 6:05 AM, Brad Casterline <[email protected]> > wrote: >> >>> Yesterday's flow test thread, along with talk of "because that is the way > we >>> have always done it" reminded me of something I have been wanting to post >>> since last Christmas-- I was 'calculating' flow tests and looking for any >>> info that might help and I discovered something that surprised me, that >>> being NFPA 13 (2007) A.23.2.1 (2). For the flowing hydrant we can either >>> attach a second gage or use a pitot. I have always used a pitot because > that >>> is the way the person who taught me had always done it. >>> >>> No question here, just thought I'd throw this out there on a Friday > morning. >>> >>> >>> >>> thanks, >>> >>> >>> >>> Brad Casterline, NICET IV >>> >>> Fire Protection Division >>> >>> >>> >>> FSC, Inc. >>> >>> P: 913-722-3473 >>> >>> [email protected] >>> >>> www.fsc-inc.com >>> >>> >>> >>> Engineering Solutions for the Built Environment >>> >>> >>> >>> _______________________________________________ >>> 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
