oops-- It occurred to me maybe I should not have put that material in my Dropbox, so I deleted it.
Here is the link to get it: https://www.fmglobal.com/fmglobalregistration/ Brad -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Wednesday, May 27, 2015 8:09 AM To: [email protected] Subject: RE: Highrise https://www.dropbox.com/s/2r3373ag0trh2q0/FMDS0311.pdf?dl=0 Tony, the above link is to FM Data Sheet 0311 Pressure Reducing Valves for Fire Protection Service, revised last month. I don't think much changed but I can't recall having ever read it, so it was interesting to me. I'll likely catch some flack, but since we are supposed to calculate the available Static and Residual ("Source Calc") at the valve inlet, I was curious what the difference would be using H-W and D-W. For D-W I used 62.4 lb/ft^3, 1.01 Centipoises. I figured 4" S10 flowing 500 and 750, and 6" S10 flowing 500, 750, and 1000. Here are the pf/ft: HW=.055, DW=.048. (4"-500). HW=.115, DW=.108. (4"-750). HW=.008, DW=.006. (6"-500). HW=.016, DW=.014. (6"-750). HW=.029, DW=.024. (6"-1000). It takes quite a bit of length to make a pound of difference, but it all adds up I guess. I don't know what software you use but it is very easy to calc it both ways these days, then decide how you feel!!! Brad > > -----Original Message----- > > From: Sprinklerforum on behalf of T. Silva > > Sent: Mon 5/25/2015 10:44 PM > > To: [email protected] > > Subject: Highrise > > > > Can you share your strategies for highrise buildings? Or direct me to > > a source for information? > > > > I am planning to reduce the pressure after the fire pump, using two > > pressure reducing valves in series. Then run two standpipes, one low > > pressure and the other, high pressure and use additional pressure > > reducing valves at each floor where the pressure exceeds 175 psi.This > > PRV at each floor will reduce the pressure (only where it exceeds 175) > > to both the sprinkler zone and hose connection. Any problem with that? > > Or do I have to use a PRV for only the sprinkler zone and a pressure > > reducing hose valve for the hose connection? The hose connections are > > 2 1/2" with 2 1/2" x 1 1/2" reducers. > > > > Any feedback will be appreciated. Thanks. > > > > Tony > > > > > > > > Call > > Send SMS > > Add to Skype > > You'll need Skype Credit Free via Skype > 253.680.7346 > 253.576.9700 (cell) _______________________________________________ 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
