On Mon, Aug 31, 2015 at 5:08 PM, Steve Leyton <[email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
> > > Pick a valve, use the manufacturer's curves. You can calculate the point > at which you need valves - high static + churn. > > Steve > > -------- Original message -------- > From: "Richard L. Mote" <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> > Date: 08/31/2015 6:01 PM (GMT-06:00) > To: [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > Subject: PRV on Standpipe Calcs > > > Anyone have a good reference on calculating PRV setting on a combined > standpipe. It's been 20 years since I've had to do one. I downloaded some > directions from Hydratec, now I'm more confused than ever. I'm going to > give them a call in the AM to see if they can give some additional guidance. > Here are the system stats. > City static 85, residual 41 @ 1350. Pump is 750gpm @ 105. Pump churn (off > pump curve) 121 psi. Combined static + churn = 206. Building is 6 stories > + partial basement. pump is in basement. Pump discharge to highest outlet = > 85'. Based on static pressure alone I figure the first 4 floors will need > PRV's on both the system and the hose valves. Where I am hung up is how to > determine the pressure settings for the system PRV's. > > Richard Mote > Designer > Rowe Sprinkler Systems, Inc. > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) -- Sent from Gmail Mobile _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
