Tell him it's a rule for doing the calc, not an absolute that is being modeled. Don't even bring up what happens as what happens in the basic calc is variable considering number of open heads, city pressure at the time of the incident, and based on a lot of constants which are always approximations. There is very large range to plus and minus and if the FD has enough flow they care not about the pressure. They brought a big pump to the party in that shiny red thing they came in.
On Tue, Nov 18, 2014 at 1:28 PM, Matt Grise <[email protected]> wrote: > Maybe you could explain that it does drop the [available] supply PSI - > thereby reducing the safety margin. It just does not increase the demand > psi. > > 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: Sprinklerforum [mailto: > [email protected]] On Behalf Of Brian Harris > Sent: Tuesday, November 18, 2014 3:22 PM > To: [email protected] > Subject: RE: Hose added to calc's. no PSI > > Craig- > The owner is very skeptical of there being enough water supply without > adding a tank, we provided calculations for the sprinkler system and now he > wants a civil engineer to provide fire calc's as well. The civil guy was > asking why we didn't include any extra psi drop for the outside hose > allowance. > > Brian Harris, CET > BVS Systems Inc. > bvssytemsinc.com > > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of > [email protected] > Sent: Tuesday, November 18, 2014 4:15 PM > To: [email protected] > Subject: RE: Hose added to calc's. no PSI > > Why does he care? > > Craig L. Prahl > Fire Protection Group Lead > CH2MHILL > Lockwood Greene > 1500 International Drive > Spartanburg, SC 29303 > Direct - 864.599.4102 > Fax - 864.599.8439 > CH2MHILL Extension 74102 > [email protected] > > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of Brian Harris > Sent: Tuesday, November 18, 2014 1:59 PM > To: [email protected] > Subject: Hose added to calc's. no PSI > > I've been trying to explain to a civil engineer that we (fire sprinkler) > include outside hose allowance into our calc's but only for the extra gpm, > not as far as additional psi goes. I'm sure it's the way I'm trying to > explain it that's not making any sense to him, can one of you more versed > in the English language help me out and put it in layman's terms for me? > > Brian Harris, CET > BVS Systems Inc. > Sprinkler Division > bvssystemsinc.com<http://bvssystemsinc.com/> > Phone: 704.896.9989 > Fax: 704.896.1935 > > _______________________________________________ > 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 > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
