I have seen things like this when the grid is not symmetrical, ie two branch lines from one main reducing to a single line attaching to the other main.
That is a little extreme though Todd Williams Fire Protection Design/Consulting Stonington, CT 860-608-4559 > > On Apr 9, 2026 at 10:11 AM, <Parsley Consulting > (mailto:[email protected])> wrote: > > > Each time I believe I've 'seen it all' something comes across my desk > which rattles my brain in a big way. > > I'm looking at three calculations for a grid, one of the remote area, the > other two are shifted one sprinkler to the East, and one to the West. > > Top of riser values: > > RA 1663.44 gpm @ 106.107 psi > East 1653.71 gpm @ 106.113 psi > West 1609.12 gpm @ 97.934 psi > > I don't believe I've ever seen a peak of a single sprinkler generate a > pressure difference of almost 9 psi (RA to West) > > I've checked all the obvious reasons - modified pipe sizes or lengths, > differing flows from sprinklers - and I don't see anything which would cause > the peaking results for the West shift > > I'm open to any suggestions. Color me baffled. > > sincerely, > Ken Wagoner, SET > Parsley Consulting > 3002 Younger Drive > Harrisonville, Missouri 64701-3909 > Phone: (760) 745-6181 > Visit the website > (https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.parsleyconsulting.com%2f&c=E,1,Y5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9ZqW2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_n5hDHeK&typo=1) > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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