As an AHJ we are in a similar position and would have to accept it if it met the absolute code minimum requirements.
These are MINIMUM requirements. Many projects may need to be designed to a higher level than the legal minimum. That is why in SC the designer is required by State Law [See ยง40-10-250(B) at http://www.scstatehouse.gov/code/t40c010.htm] to be either a PE or [when exempt under the engineering law] a SC licensed sprinkler contractor with a NICET IV. It is the responsibility of the designer to account for reasonably foreseeable problems with the water supply capacity during the design life of the system. The designer will be the person in court being asked to justify their design choices if the system fails... The NFPA Handbook commentary to (2007) NFPA 13 23.1.2 [page 844] provides good information that should be read and carefully considered by the designer. David W. S. Blackwell, II, PE, CFI-I, CFPE Engineering ---------------------------------------------------------------- Office of State Fire Marshal 141 Monticello Trail Columbia, SC 29203 Phone: 803.896.9833 Fax: 803.896.9806 Email: [email protected] OSFM Website: http://www.llr.state.sc.us/firemarshal.asp ---------------------------------------------------------------- -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Richardson, R Sent: Monday, November 30, 2009 3:20 PM To: [email protected] Subject: RE: Calcs-How much margin 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) _______________________________________________ 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)
