65 PSI is required at the valve outlet, but you are on to a very important consideration. Depending on hose type, actual inside diameter and the pressure class of the nozzle or tip, you may require more pressure.
Off the topic, your query pertains to Class II - ask the responding fire department if they even want Class II in the building (regardless of what the code says). It may well serve everyone's needs better if these stations were eliminated in favor of the Class III exception in sprinklered buildings or placed as just 1.5" or 2.5" hose valves at a pressure to be specified by the FD. The foregoing is my opinion only and does not necessarily represent the opinion or intent of the NFPA 14 Technical Committee on Standpipe and Hose Systems. Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: Monday, July 11, 2011 10:11 PM To: [email protected] Subject: NFPA 14 Standpipe systems shall be one of the following: (1) Hydraulically designed to provide the required waterflow rate at a minimum residual pressure of 100 psi (6.9 bar) at the outlet of the hydraulically most remote 21/2-in. (63.5-mm) hose connection and 65 psi (4.5 bar) at the outlet of the hydraulically most remote 11/2-in. (38.1-mm) hose station. 65 psi is required at the end of the 100 foot long 1 1/2" hose or at the beginning? I would say at the beginning as that would be the outlet of the hose stations. But would like other opinions. Thanks, Tony _______________________________________________ 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)
