I would not approve it based on the fact we have a local code requirement to have a 10 psi cushion. However, without that local code requirement it would definitely be approved. Without a local code requirement for a cushion there is no basis to not approve it.
Rich Richardson Seattle Fire Department -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mike Hairfield Sent: Monday, November 30, 2009 12:17 To: AFSA SprinklerFORUM; Richardson, R Subject: RE: Calcs-How much margin I would approve it but ask for "As Built" Calcs!!!!! Mike > From: [email protected] > To: [email protected] > Date: Mon, 30 Nov 2009 14:15:07 -0600 > Subject: RE: Calcs-How much margin > > I would approve it. > I would also check the calculations VERY, VERY close. > > David Autry > Plans Examiner > Nebraska State Fire Marshal's Office > 246 S. 14th Street > Lincoln, NE 68508 > 402-471-9659 > 402-471-3118 fax > www.sfm.ne.gov > > ** Note new email address: [email protected] > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Monday, November 30, 2009 2:11 PM > To: [email protected] > Subject: Calcs-How much margin > > I've got a calc I'm reviewing, after all said and done, 3.63 psi margin > between demand and available. Designer used 4.2K heads to get the flow > exactly to the decimal of the required flow. This is an industrial type > project. With a .15 gpm/sf density at 92 sf per head, the flow would be 13.8 > gpm and he's dead on the money. The concern would be that over the years if > there was any change in the water supply or decay of the piping, that the > operation of half the design area would be questionable. > > Would you approve or reject this design? Is this cutting it just a bit close? > > > > > Craig L. Prahl, CET > Fire Protection Specialist > Mechanical Department > CH2MHILL > Lockwood Greene > 1500 International Drive > PO Box 491, Spartanburg, SC 29304-0491 > Direct - 864.599.4102 > Fax - 864.599.8439 > [email protected] > http://www.ch2m.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) _______________________________________________ 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)
