Consider the following picture (I'm an Engineer, not an artist). It shows the same connections as the one you presented, in 2D and exaggerated to emphasize that the main routing doesn't matter. I would argue this is a grid, whether it is laid out the way I show, or the way it is on your drawing.
As Matt said, you could remove the main shown on the bottom half of your drawing and have two loops connected by a single main, which I don't think anyone could argue as a grid. https://linksharing.samsungcloud.com/wfZyNvb88QlZ On Tue, Oct 26, 2021, 1:01 PM Travis Mack via Sprinklerforum < [email protected]> wrote: > Gridded System - parallel cross mains connected by multiple branch lines > causing sprinkler to receive water from both ends. > > Looped System - Multiple cross mains tied together to provide more than > one path for water. Branch lines are not tied together. > > You don't have parallel mains, You don't have cross mains tied together > either. I would go with Kevin Hall's answer. The intent of a gridded > system is a single sprinkler can receive water from two directions. > Therefore, it seems to be more of a grid than a loop. > > Travis Mack, CFPS, CWBSP, RME-G, COC, SET > Senior Engineering Manager > MFP Design > 480-505-9271 ext. 700 C: 480-272-2471 > [email protected]<mailto:[email protected]> > www.mfpdesign.com<http://www.mfpdesign.com> > > Send large files to us via: https://www.hightail.com/u/MFPDesign< > https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hightail.com%2Fu%2FMFPDesign&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=eGdMZGu2wXhUupGwgGTrqF3b54OP5%2BAZvlHhABSexWY%3D&reserved=0 > > > > From: Sprinklerforum <[email protected]> On > Behalf Of Richard Carr via Sprinklerforum > Sent: Tuesday, October 26, 2021 10:56 AM > To: [email protected] > Cc: Richard Carr <[email protected]> > Subject: RE: Gridded dry system > > With the center fed main and not two outer mains with lines fed from both > mains, I would not call it a grid, no matter what you call it, I like the > layout and should not be anything code wise to prohibit it. > > Thank you > > Richard M. Carr, SET > Project Manager/Design > Diboco Fire Sprinklers, Inc. > 325 Jackson Loop Road > Flat Rock, NC 28731 > > [email protected]<mailto:[email protected]> > 828-696-3400 > 828-696-2288 Fax > 828-708-9118 Mobile > > > > -----Original Message----- > From: Sprinklerforum <[email protected] > <mailto:[email protected]>> On Behalf Of > Kevin Hall via Sprinklerforum > Sent: Tuesday, October 26, 2021 1:42 PM > To: [email protected]<mailto: > [email protected]> > Cc: Kevin Hall <[email protected]<mailto:[email protected]>> > Subject: Re: Gridded dry system > > The operating sprinkler will receive water from two directions. That meets > more of the definition of gridded than it does loop. > > > The above is my opinion and has not been processed as a formal > interpretation in accordance with the NFPA Regulations Governing Committee > Projects. This is provided with the understanding that the AFSA assumes no > liability for this opinion or actions taken on it and they are not to be > considered the official position of the NFPA or its technical committees. > AFSA cannot provide design or consulting engineering services, and this > opinion should therefore not be considered, nor relied upon, as such. > > > Kevin Hall, M.Eng., P.E., ET, CWBSP, PMSFPE > > Coordinator, Engineering and Technical Services > > American Fire Sprinkler Association > > [email protected]<mailto:[email protected]> > > 214-349-5971 > > > On Tue, Oct 26, 2021 at 1:38 PM Richard Carr via Sprinklerforum < > [email protected]<mailto: > [email protected]>> wrote: > > > I think you could call it a looped dry system if it will make you feel > > better. > > > > Richard M. Carr, SET > > Project Manager/Design > > Diboco Fire Sprinklers, Inc. > > 325 Jackson Loop Road > > Flat Rock, NC 28731 > > > > [email protected]<mailto:[email protected]> > > 828-696-3400 > > 828-696-2288 Fax > > 828-708-9118 Mobile > > > > > > > > -----Original Message----- > > From: Sprinklerforum <[email protected] > <mailto:[email protected]>> > > On Behalf Of Ed Kramer via Sprinklerforum > > Sent: Tuesday, October 26, 2021 1:31 PM > > To: [email protected]<mailto: > [email protected]> > > Cc: Ed Kramer <[email protected]<mailto:[email protected]>> > > Subject: Gridded dry system > > > > Is this sprinkler system a gridded system? I've avoided this type of > > design in the past for dry systems because it 'kinda' a grid, but not > > really. Now I'm questioning my questioning. What are your thoughts? > > > > > > > > Reference NFPA 13 (2019) sections 8.2.3.10<http://8.2.3.10> and > 3.3.206.5<http://3.3.206.5>. > > > > > > > > https://www.dropbox.com/s/u2hw3cbvlga4fcq/Dry%20Attic%20System.pdf?dl=< > https://www.dropbox.com/s/u2hw3cbvlga4fcq/Dry%20Attic%20System.pdf?dl=> > > 0 > > > > > > > > > > > > Ed Kramer > > > > > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected]<mailto: > [email protected]> > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl< > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl> > > er.org _______________________________________________ > > Sprinklerforum mailing list > > [email protected]<mailto: > [email protected]> > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl< > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl> > > er.org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected]<mailto: > [email protected]> > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > < > 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 > < > 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
