My thought here is, and maybe I'm not stating it well or not fully understanding your comment, that I have a pump and tank supplying the hydrant with 1500 (example) gpm at above the FMs required pressure, and the sprinkler system simultaneously with 450 gpm at the required pressure (say 45 psi as an example). Why would I need to add 250 gpm to the last line of the sprinkler calc? Isn't this already accounted for in this closed (no offsite source) system?
On Wed, Jun 29, 2011 at 12:14 PM, Todd Williams <[email protected]> wrote: > Perhaps those in the fire service could answer this better, but I'll give > my thought. My take is that our designs are to provide sprinkler protection > plus one or two hose streams to a fire prior to the fire department > augmenting the water supply (except for systems with pumps that equal or > exceed the pumps in their trucks) If that is the case, the hose stream > calculation needs to be included. If the pump is large, the hose streams > would be needed as part of the overall fire protection plan. So yes, you > have to include them. > > > At 02:53 PM 6/29/2011, you wrote: > >Back to an old question but a little different. Tank with sufficient > >capacity to supply duration for both a yard hydrant and the sprinkler > >system. Pump sufficient to supply required psi to the sprinks and meet the > >AHJ's requirement at the hydrant. Question: When calculating the sprinks > do > >I need to add the 250 gpm hose allowance on that demand curve? This seems > to > >be a 'safety cushion" for a water supply controlled by an outside party > such > >as a municipality. This is not the case here wherein the quantity of water > >and delivery pressures are completely controlled: a closed versus open > >system if you will. > > > >-- > >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 > > > >They are happy men whose natures sort with their vocations. -Francis > Bacon, > >essayist, philosopher, and statesman (1561-1626) > >_______________________________________________ > >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) > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860.535.2080 > www.fpdc.com > > _______________________________________________ > 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) > -- 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 They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ 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)
