Sloppy syntax. In MANUAL standpipe systems the FDC is the primary water supply ...
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Tuesday, May 13, 2014 1:59 PM To: Sean Lockyer; [email protected] Subject: RE: Can a hydrant flow from the pumper connection be used for thehydraulic calculations ? The premise puts cart ahead of horse. The inlet connection is, by definition, a supplemental water supply and not a primary one in fire sprinkler systems. Every system is required to have at least one automatic water supply capable of meeting the demand in flow and pressure. In standpipe systems, the FDC is the primary water supply and NFPA 14 now requires that manual systems be hydraulically calculated from the inlet connection to the most demanding hose connections as such. So ... no, you can't do that per the standard. Steve Leyton -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Sean Lockyer Sent: Tuesday, May 13, 2014 1:48 PM To: [email protected] Subject: Can a hydrant flow from the pumper connection be used for thehydraulic calculations ? Here is an interesting question: In the event that you do not have an adequate amount of water flow (in terms of GPM) is it acceptable to flow the 4-1/2" pumper connection in lieu of the standard 2-1/2" connection on the side ? I know that in NFPA 291 it is recommended to only blow off the 2-1/2" outlet but when you blow off the pumper connection there is a formula used to reduce it. However, even after the formula reduction you still have a far higher amount of water (once again, in terms of GPM). My question is this, can you use that GPM in your hydraulic calculations ? I would have to think that most AHJ's would be hesitant to allow this to be used since you are artificially inflating the water supply. What does everyone else think ? Sean Lockyer Project Designer 4617 Parkbreeze Court Cell 386-279-1197 Orlando, Florida 32808 [email protected] Phone: 407-816-9101 www.AITLifeSafety.com Fax: 407-816-9104 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
