And besides, the rule is for hangers on pipe to PEND heads in ceilings, to restrain against the thrust that might push the head above the ceiling-- if the FD is there, the auto aspect has changed.
-----Original Message----- From: Thom [mailto:[email protected]] Sent: Wednesday, January 05, 2011 10:32 AM To: [email protected] Subject: RE: Hanger spacing - 100 psi No this is not the pressure 13 is referring too! What is the normal system operating pressure? That is the number you use. Can a FDC push pressure over 100 Psi? Of course. Can an FDC push pressure over 200 Psi? Yes, but do we design bassed upon that? No! why because normally that is not what the pressure will be when the system operates, and if it operates the responding engine company may not even charge the hose to the FDC if the fire is already out. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Wednesday, January 05, 2011 5:16 AM To: [email protected] Subject: Hanger spacing - 100 psi NFPA 13 (2002) section 9.2.3.4.3 discusses hanger spacing deviations for piping with maximum pressure exceeding 100 psi as being different from spacing with pressures less than that. If the fire department hooks up to the FDC with 150 psi pressure, would that be the valve used for determining the maximum pressure? If that is the case, when would the lesser value be used? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.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)
