Note the use of "as appropriate" -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bobby McCullough Sent: Tuesday, May 29, 2007 1:37 PM To: [email protected] Subject: RE: Minimum safety factor
He could be referring to: 13: 2007 23.2.1.2 The volume and pressure of a public water supply shall be determined from waterflow test data. An adjustment to the waterflow test data to account for daily and seasonal fluctuations, possible interruption by flood or ice conditions, large simultaneous industrial use, future demand on the water supply system, or any other condition that could affect the water supply shall be made as appropriate. Note the use of "shall". Georgia requires a 10 psi cushion and it is in the Rules and Regulations. Some local AHJs have changed it to 5 psi in combination with a 24 hour static pressure study. Bobby McCullough -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of George Church Sent: Tuesday, May 29, 2007 8:21 AM To: [email protected] Subject: RE: Minimum safety factor 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) _______________________________________________ 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)
