This does not compute. If you have a six-story building it's what, 70' high? With static and friction head, that shouldn't be more than about 40-43 PSI from the street, unless you're using 3" risers ...
And remember that the 100 PSI is at the discharge side of the valve; most hose valves have at least 3 PSI and sometimes as much as 7 or 8 PSI head loss (we've had this discussion on-forum before). Steve -----Original Message----- From: Todd Williams - work [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 07, 2007 6:22 AM To: [email protected] Subject: pump tricks I seem to be running into several situations lately where there is a very fine balancing act between meeting the 100 psi at the top outlet of the standpipe and not exceeding 175 psi at the base of the riser. (6 story hotels are a good example) Does anybody have any good ideas they'd care to share on making these work? I'd like to limit the use of extra-heavy pipe and fitting (especially larger sizes) and PRVs. I have several tricks up my sleeve, but I'm running out of sleeves. Todd 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
