Time to ask him to show it to you, you just can't seem to locate the imaginary section he's trying to enforce.
I just love the paragraphs where cushions are mandated- like "add a 10% buffer"- does that mean Add 10% to the volume? Add 10% to the required pressure? 10% of the demand? Decrease supply by 10%? If they'd require tank gradient correction and then a REASONABLE cushion, tailored to the specific job's water supply, it would go a l;ong way in making sense of "what they want" being reasonable. A 10 PSI cushion in a cliff-like water supply isn't much, and 10 PSI on a 42 PSI residual-on a mature, flat curve supply- could easily force a fire pump where it isn't justified or an improvement. glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - work Sent: Tuesday, May 29, 2007 8:01 AM To: [email protected] Subject: Re: Minimum safety factor I have never seen anything in NFPA 13 (I'll go out on a limb and say there isn't anything). FM uses a 10 psi cushion. Maybe that's where he came up with the number. At 07:21 AM 5/29/2007, you wrote: >I have an AHJ requesting that I provide 10PSI (not 10%, I already >checked) safety factors on my hydraulic calculations. I asked him where >he came up with this number since they do not have a published fire >ordinance. He referred me to the appendix in 13 but will not specify a >specific section. Is there any such section pertaining to a safety >factor requirement that I am missing? > >Thanks, >Dewayne Martinez >Design Build Fire Protection >[EMAIL PROTECTED] > > >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > >To Unsubscribe, send an email to:[EMAIL PROTECTED] >(Put the word unsubscribe in the subject field) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut 860-535-2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
