Still not semantically correct. You don't have to proved "fire flow" and "sprinkler demand" concurrently. Sprinkler demand is calculated as (sprinkler design area + hose stream allowance) x duration. Fire flow is just fire flow. You determine the most demanding and the water supply volume has to satisfy the worst case. However, the residual pressures at which these occur are usually very different - fire flow requires a 20psi minimum residual pressure. So it's more like sizing a bag for the greater load of either oranges or apples.
Steve L. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Monday, May 13, 2013 10:35 AM To: [email protected] Subject: Re: Sizing tanks with hydrants? Jack, I don't think you need to allow hose stream for this, but as mentioned you have to add fire flow per IFC, with whatever reduction for sprinklers the Fire Marshal allows. On Mon, May 13, 2013 at 10:30 AM, Jack Carlson <[email protected]> wrote: > > Yes - Tank serves sprinklers and hydrants > > NFPA 13 2010 edition > > Figure 11.2.3.1.1 .20/1500 > > Table 11.2.3.1.2 250 hose for 60 minutes min (assume remote > supervision) > > > Jack W. Carlson, SET > Triple "A" Fire Protection > Office - 251.649.2034 > Fax - 251.649.2037 > Cell - 706.247.5050 > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Bobby > Gillett > Sent: Monday, May 13, 2013 1:19 PM > To: [email protected] > Subject: Sizing tanks with hydrants? > > When sizing a water storage tank feeding a fire pump for a new > facility with multiple sprinkler systems and fire hydrants, do you > have to include any type of allowance for the hydrants? The tank will > be the sole source of supply for all (rural area). There will be no > hose stations or standpipes, only interior sprinkler systems - OH Group II with monitored alarms. > Typically this would be an 18,000 gallon tank minimum (.20x1500x60 mins). > I don't see anywhere that requires this, just making sure. > > > > Thank you in advance. > > > > Bobby Gillett > > Sr. Project Manager > > Key Fire Protection, Inc. > > (731) 424-0130 office (731) 424-9285 fax > > (731) 267-4853 cell > > <http://www.keyfireprotection.com> www.keyfireprotection.com > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.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) _______________________________________________ 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
