Neither. You need 4,000 gpm at the 6 or how ever many hydrants there are. At the flow you need 20 psi residual at the same hydrants. Think of it like a hydrant flow test with 3 or so hydrants open and the 4th residual of 20.
Chris Cahill Fire Protection Engineer Burns & McDonnell 952-656-3652 [email protected] -------- Original message -------- From: [email protected] Date:12/05/2014 8:29 PM (GMT-06:00) To: [email protected] Subject: Re: A Poll of the Experienced I think I agree with you, but to be very specific, let's assume I'm designing a new building on a greenfield site which is served by a public water system. The building is type V construction, 600,000 square feet and fully protected with ESFR sprinklers. Table B105.2 indicated a fire flow rate of 8000 GPM, reduced to 4000 GPM for sprinkler credit, at minimum 20psi. My question is, WHERE is this 4000 GPM at 20 psi measured? At the city water main connection? Or at the fire pump discharge? Mark at Aero 602 820-7894 Sent from my iPhone > On Dec 5, 2014, at 7:17 PM, "Cahill, Christopher" <[email protected]> > wrote: > > Neither. It's the flow you need for a building. You might get it from a muni > or private. Absolutely nothing to do with sprinklers except you get a > reduction if building is sprinklered. > > > Chris Cahill > Fire Protection Engineer > Burns & McDonnell > 952-656-3652 > [email protected] > > > -------- Original message -------- > From: [email protected] > Date:12/05/2014 8:12 PM (GMT-06:00) > To: [email protected] > Subject: A Poll of the Experienced > > Over this weekend I'd like to ask the opinion of those forumites experienced > in the reading and understanding of the "International Fire Code" on the > topic of "Fire Flow" described in Chapter 5, and further prescribed in > Appendix B. Is the available flow rate and residual pressure referenced, > intended to describe these values of the municipal or private water supply > available to the building site? Or, the minimum output of any fire pump > associated specifically with the automatic sprinkler system in the building? > Any takers? Questions? Clarifications? > Thanks for any answers. > > Mark at Aero > 602 820-7894 > > Sent from my iPhone > > _______________________________________________ > 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
