Yeah I thought so as well but it’s one of those times when you think you are sure you know something and then can’t find it and question yourself …
John Irwin DynaFire Inc. *From:* Sprinklerforum [mailto: [email protected]] *On Behalf Of *Travis Mack *Sent:* Tuesday, November 21, 2017 10:11 AM *To:* [email protected] *Subject:* Re: [EXTERNAL] Interesting issue .. residential sprinklers .. Check chapter 11. I don’t have the standard in front of me. But that has been in the standard for about 2-3 decades. 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 8:07 AM, John Irwin <[email protected]> wrote: I thought we were talking about the standard spray. But you’re correct. It does look like Reliable has the residential option to allow me to be greater than 4” from the deck. I can’t find where NFPA 13 allows a 4 residential sprinkler calculation. I was starting to think that was only in 13R. Can you direct me to that code reference? John Irwin DynaFire Inc. *From:* Sprinklerforum [mailto: [email protected]] *On Behalf Of *Travis Mack *Sent:* Tuesday, November 21, 2017 10:02 AM *To:* [email protected] *Subject:* Re: [EXTERNAL] Interesting issue .. residential sprinklers .. 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] <[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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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