That section is when there are no hose valves or hydrants on the water supply from the tank. When there is no means to utilize hoses there is no need to account for the Hose Stream allowance in the calcs.
This section does not apply to systems where the fire water storage tank supplies a loop where there are either hydrants or buildings with hose connections. If I remember correctly, if your building has hose connections internally, you add the interior hose demand at the base of the riser and the remainder at the point of connection to the existing UG supply. If you only have yard hydrants and no internal hose connects you add the total hose stream demand at the point of connection to the existing UG supply. Remember that sprinklers are for control, not necessarily for extinguishment so there could be sprinklers flowing and hose line attack occurring at the same time. Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jarron Gass Sent: Wednesday, June 29, 2011 3:26 PM To: [email protected] Subject: RE: Hose Stream NFPA13, 2010 edition 11.1.6 Hose Allowance. 11.1.6.1 An allowance for inside and outside hose shall not be required where tanks supply sprinklers only. Jarron J. Gass - J. & J. Fire Protection Co., Inc. 101 Powell Rd., Butler, PA 16002, -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Wednesday, June 29, 2011 3:15 PM To: [email protected] Subject: Re: Hose Stream 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) _______________________________________________ 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) _______________________________________________ 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)
