Tank sizing for some situations presents an uncomfortable dilemma because there are pressures from all sides to minimize the tank size yet we all know the tank contains the single most important item. Some codes can be argued to say the size is for sprinkler demand only. The code might also qualify that by implying the actual system calculated sprinkler demand is used for sizing. So in this case the OH-2 system might have a 1.8 overage at its most demanding location. But then what happens if the fire event occurs at the least pressure demanding part of the system where the overage is higher than 1.8? Here we can only hope that more water in less time is better and perhaps not so many sprinklers open and someone is present to manage the run time. The same pressures to limit the tank size might also work against installing a more water efficient sprinkler system for that OH-2 space.
> On Mar 20, 2019, at 8:57 AM, Travis Mack <[email protected]> wrote: > > If you have hydrants downstream of the tank, do you need to account for site > fire flow requirements? > > If so, you could be looking at 180k gallons and up. > > Travis Mack, CFPS, CWBSP, RME-G, SET > 480-505-9271 > MFP Design, LLC > "Follow" us on Facebook: > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > <https://www.facebook.com/pages/MFP-Design-LLC/92218417692> > Send large files to MFP Design via: > https://www.hightail.com/u/MFPDesign <https://www.hightail.com/u/MFPDesign> > > Sent from my iPhone > > On Mar 20, 2019, at 6:45 AM, Brian Harris <[email protected] > <mailto:[email protected]>> wrote: > >> Looking for preliminary sizing for a water storage tank. Worst case for this >> particular building would be OH-2. (.2/1500 = 300gpm + 250 hose. 550gpm for >> a minimum of 60 minutes = 33,000 gallons). Per NFPA22 (2013) 5.1.3.1 round >> it up to 40,000 gallons. Does that sound about right? >> >> Brian Harris, CET >> BVS Systems Inc. >> Design Manager >> bvssystemsinc.com <http://bvssystemsinc.com/> >> Phone: 704.896.9989 >> Fax: 704.896.1935 >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> <mailto:[email protected]> >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> <http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > <mailto:[email protected]> > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > <http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org>
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