That is mind-bending Craig, thanks. I do not doubt the procedure for coming up with 2 million. I guess what's bothering me is along these lines: "If a couple three thousand GPM flowing for 30 minutes doesn't do the trick, how is 10 times that going to help"?
Brad -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Thursday, August 28, 2014 7:11 AM To: [email protected] Subject: RE: 1, 2 & 3 hour stored water duration requirements Fire Flow from Section 507 of the IFC is typically the driver when it comes to large aboveground tanks. This is one issue often forgotten or overlooked in fire protection design. When determining the adequacy of water supplies, both the sprinkler flow and Fire Flow must be considered. I had a project last year with 8000 gpm for 4 hour duration for fire flow. Yes it was a big honking tank, 2 million gallons. Deluge system flows were at the 7500 gpm mark. Got one right now that's a bit smaller with only 6000 gpm for 4 hours for fire flow. Rule of thumb for estimating tank cost is between .60 cents and $1.00 a gallon depending on location and installation issues. 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] _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
