That gives you about 25 psi of friction loss. If you can make that work you are good with residential. Why 5-6 sprinklers if going with residential pendents? Are you not permitted to do the 4 residential sprinkler calc?
Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone > On Nov 21, 2017, at 7:58 AM, John Irwin <[email protected]> wrote: > > Well I have not run the calc, but I’ll have a 750GPM pump at about 135PSI of > head 100’ below this calc area. It looks like I will end up calculating 5 > sprinklers … maybe 6 > > John Irwin > DynaFire Inc. > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Travis Mack > Sent: Tuesday, November 21, 2017 9:54 AM > To: [email protected] > Subject: Re: [EXTERNAL] Interesting issue .. residential sprinklers .. > > If you are truly 20x20, then you are looking at 67 psi with the 4.9 vs 13 psi > with something like a Tyco EC-11. Do you have enough pressure where 50 psi is > of no issue? > > Travis Mack, SET > MFP Design, LLC > "Follow" us on Facebook: > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > Send large files to MFP Design via: > https://www.hightail.com/u/MFPDesign > > Sent from my iPhone > > On Nov 21, 2017, at 7:46 AM, John Irwin <[email protected]> wrote: > > Yes. That’s an option as well. I have a pump so I am not terribly worried > about the demand. However the difference in price between a residential > pendent and something like a Tyco EC-5 is over $10. And I’m looking at over > 1,000 of these buggers. > > John Irwin > DynaFire Inc. > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Kyle.Montgomery > Sent: Tuesday, November 21, 2017 9:44 AM > To: [email protected] > Subject: RE: [EXTERNAL] Interesting issue .. residential sprinklers .. > > Residential sprinklers are “permitted” in dwelling units, not “required”, > right? Couldn’t you use any one of a number of commercial QR extended > coverage sprinklers? > > That might mess you up if you are trying to do a 4-sprinklers residential > calc… or it could help because you could get a larger K-factor and lower > starting pressure for 20x20. > > -Kyle M > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of John Irwin > Sent: Tuesday, November 21, 2017 4:27 AM > To: [email protected] > Subject: [EXTERNAL] Interesting issue .. residential sprinklers .. > > I am working on a project with a lot of 20x20 rooms in dwelling units. I have > a concrete deck so my piping will be exposed. I am trying to find a 20x20 > solutions but keep running in to road blocks. Maybe someone has an idea. > > The way I see it, I need one of the following … > > I need a residential pendent sprinkler that can be installed with a deflector > distance from the deck greater than allowed by NFPA 13 OR I need a > residential UPRIGHT sprinkler listed for 20x20 spacing OR I need a listed > hanger attachment that will allow me to install 1" branch piping tight to a > concrete deck. > > And go. > > > John Irwin > DynaFire, Inc. > > > _______________________________________________ > 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
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