In NFPA 13 that term is only used with regards to support of piping. BUT, a cushion or safety factor can be mandated by the AHJ and it can vary.
I've seen requirements for 10% or 10psi off your tested residual and Static, 10% off just the residual, 15% difference between demand and actual available, it runs the gamut. Everyone probably has a number they use of what they feel safe with. There are factors that often weigh into that number. First check with the AHJ or Underwriter to see if they have a requirement. 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 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Karen Purvis Sent: Wednesday, September 23, 2009 2:47 PM To: [email protected] Subject: Safety factor Can anyone tell me, does NFPA 13 or 14 say anything about a particular safety factor to be used in the hydraulic calculations? Karen Purvis Senior Designer Facility Systems Consultants 713 South Central Street, Suite 101 Knoxville, TN 37902 ph.865-246-0164 fax 865-246-1084 _______________________________________________ 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)
