If you were to put caps on the left and right lines going north and south, it resembles a compound gridded system and a sprinkler can receive water from both sides.
The east and west lines are essentially the mains and so is the 4" in the middle. Yes is has a looped piping arrangement and is symmetrical but it is a gridded system by NFPA-13 definition. If you were to not tie the lines together, it would be a loop. Regards, Sean W. Conlin E:[email protected] This message, including any attachments is considered confidential and for use only by the intended recipient(s). Any other distribution, copying or disclosure is strictly prohibited. Please delete this communication and notify Demand Sprinkler Design Inc. if you are not the intended recipient or have received this message in error. Demand Sprinkler Design Inc. accepts no responsibility or liability for any loss or damage from use, including damage from viruses. -----Original Message----- From: Ed Kramer <[email protected]> Sent: October 26, 2021 1:31 PM To: [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 and 3.3.206.5. https://www.dropbox.com/s/u2hw3cbvlga4fcq/Dry%20Attic%20System.pdf?dl=0 Ed Kramer _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
