Correct, and that is helpful. A lot depends on the sprink/piping layout. As others have pointed out, the difference in pipe size normally isn’t much. Just finished a project where the main down the corridor had to be 2.5” to make residential sprinks work. Was able to reduce it to 2” when we switched the design to QR. The primary reason was back-to-back sidewall sprinks in the demising walls combined with a marginal water supply – if the water supply had been better, a 2” main would have worked for the residential sprinks also. Just another tool to have in the toolbox.
Ed Kramer Bamford Fire From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack Sent: Wednesday, March 01, 2017 10:51 AM To: [email protected] Subject: Re: Dwelling Unit Sprinkler Calc You can use small room rule and do room area divided by number of heads to get 0.1 flow. Then compare that to data sheet. Travis Mack, SET 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 Sent from my iPhone On Mar 1, 2017, at 9:43 AM, Ed Kramer <[email protected] <mailto:[email protected]> > wrote: I agree – 4 heads regardless of walls, even if the walls are rated. It creates a bit of a penalty when using residential sprinks. I understand the reasoning back when we didn’t provide a .10 density, but not so much now. Sometimes I’ve found it’s more economical to switch to QR sprinks and then utilize the room design method. Just depends on the particulars of your layout. Ed Kramer Bamford Fire From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack Sent: Wednesday, March 01, 2017 10:17 AM To: [email protected] <mailto:[email protected]> Subject: Re: Dwelling Unit Sprinkler Calc It is regardless of walls. I pick 4 on one line if they are the most demanding. If unsure, just throw on a few calc areas and take the most demanding one. (Another plug for Autosprink - draw the extra remote areas. Tell it to keep most demanding and you are done). Travis Mack, SET 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 Sent from my iPhone On Mar 1, 2017, at 9:05 AM, Dewayne Martinez <[email protected] <mailto:[email protected]> > wrote: NFPA 13 (10) section 11.3.1.1 also includes “adjacent”. What does this mean actually? 4 heads on the same line regardless of the walls or 4 heads in the same area but may be supplied from different lines? The pictures in the appendix are not very clear. Thanks, Dewayne From: Sprinklerforum [mailto:[email protected] <mailto:[email protected]> ] On Behalf Of [email protected] <mailto:[email protected]> Sent: Friday, July 08, 2016 9:13 AM To: sprinklerforum Subject: Re: Dwelling Unit Sprinkler Calc In response to the original question, is it just me or are we over-thinking this? NFPA 13 says that when using residential heads, you calculate the 4 heads that produce the greatest hydraulic demand. No mention of units, rated walls, corridors, type of construction, etc. I didn't know George Church, but I would have liked him. _____ From: "Travis Mack" <[email protected] <mailto:[email protected]> > To: [email protected] <mailto:[email protected]> , "sprinklerforum" <[email protected] <mailto:[email protected]> > Sent: Tuesday, July 5, 2016 3:44:35 PM Subject: Re: Dwelling Unit Sprinkler Calc I'd probably grab the adjacent sprinkler in the adjacent room. Travis Mack, SET 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 Sent from my iPhone On Jul 5, 2016, at 12:34 PM, Bob <[email protected] <mailto:[email protected]> > wrote: I have a NFPA 13 building with Dwelling Units. They each have three Residential Sprinklers. 13 requires a four head calc. Can I calc the 3 residential sprinklers and pick up one QR sprinkler in the corridor and still satisfy the 4 head requirement? Or, should I pick up one residential sprinkler from an adjacent dwelling room? Thank you, Bob Knight, CET III 208-318-3057 <image002.jpg> _______________________________________________ Sprinklerforum mailing list [email protected] <mailto:[email protected]> 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 _______________________________________________ Sprinklerforum mailing list [email protected] <mailto:[email protected]> 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
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