[Sprinklerforum] Re: Once upon a grid...

[Rick Matsuda]

The rule is…you must calculate the “hydraulically most demanding area” which is often difficult to determine.  Rick On Feb 18, 2023, at 2:11 PM, Vince Sabolik <vi...@wtfp.net> wrote:  Thanks Rick - I fully understand the hydraulic stuff, but I was hoping to be able to point to a rule somewhere. On 2/18/2023 2:53 PM, Rick Matsuda wrote: It’s hydraulics. If you have a remote area in the middle of the grid, then water is flowing to the sprinklers from both mains. If the remote area has four sprinklers on each branchline, then two sprinklers are fed from each main. If you have six sprinklers on each branchline, then three sprinklers are fed from each main.  As a plan reviewer, I required an additional remote area to be calculated if there was more than half the number of sprinklers on deadend “outriggers” if all the branchline pipes were the same size. The deadend lines are hydraulically more demanding.  I also required additional remote areas if you down-sized the outrigger piping.   Rule of thumb for you…don’t put more than half the number of sprinklers from the width of the remote area on an outrigger and don’t change the outrigger pipe sizes.  Rick Matsuda On Feb 18, 2023, at 1:43 PM, Vince Sabolik <vi...@wtfp.net> wrote:  Thanks Mike - That sure would explain a lot of uncalculated three head outboards that I've seen, but I was hoping for a written down rule somewhere. On 2/18/2023 2:00 PM, Mike Morey wrote: I was always told it was half the number of heads per line in the remote area. Theory being roughly half the water goes each way back to the mains anyways, so half the heads was half the water that one direction. Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Manager • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 /  cell 260.417.0625 /  fax 260.487.7991 email mmo...@shambaugh.com Vince Sabolik West Tech Fire Protection, Inc. 11351 Pearl Road   /   Strongsville, Ohio   44136 Phone 440 238-4800    Fax  440 238-4876   Cell 440 724-7601 _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org --

Vince Sabolik West Tech Fire Protection, Inc. 11351 Pearl Road   /   Strongsville, Ohio   44136 Phone 440 238-4800    Fax  440 238-4876   Cell 440 724-7601 _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org

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