We calc 4 residential heads...that is the section it is under and therefore meets the letter of the law in my honest opinion. If res heads are used in the corridor we do exactly what Travis suggests and pick up the remaining heads in the corridor and check the adjacent rooms as well until we find the 4 most demanding in a reasonable adjacent area. Since they do not differentiate between compartments sometimes you end up flowing very demanding sidewalls from 2 adjacent rooms. Honestly it often does not change pipe sizes anyway but they are the most demanding.
My 2 cents worth - better safe than sorry with the differences we usually see being so small. Greg Greg McGahan Living Water Fire Protection, LLC <http://www.livingwaterfp.com> 1160 McKenzie Road Cantonment, FL 32533 850-937-1850 fax 850-937-1852 On Wed, Mar 1, 2017 at 10:43 AM, Ed Kramer <[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]. > org] *On Behalf Of *Travis Mack > *Sent:* Wednesday, March 01, 2017 10:17 AM > *To:* [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 > > 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 <dmartinez@total-mechanical. > com> 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]. > org] *On Behalf Of *[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]> > *To: *[email protected], "sprinklerforum" <sprinklerforum@lists. > firesprinkler.org> > *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 > > 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]> 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 <(208)%20318-3057> > > <image002.jpg> > > > > _______________________________________________ > 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 > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > >
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