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] <[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
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