Personally, I have always calculated the outriggers because sometimes they are more demanding. If a designer reduces the spacing between the sprinklers on the outriggers to make up for the distance against the wall, this can force you to pick up extra heads in the same Sq Ft area. It takes a couple of minutes to be sure and I have busted people in review where the calcs did not work.
On Sat, Feb 18, 2023 at 11:31 PM Travis Mack <[email protected]> wrote: > With the modern software systems it’s quite simple. You just put as many > design areas in the plan as needed to find the most demanding. It’s not > like we are doing hand calcs and taking hours to do them. It is generally > only a few seconds to a few minutes to put a calc area on a system. > > Travis Mack, SET > > *M.E.P.CAD* | > > 181 N. Arroyo Grande Blvd. #105 I Henderson, NV 89074 > > www.mepcad.com | *m: 480.547.9348* > > > > *AutoSPRINK | AutoSPRINK FAB | AutoSPRINK RVT | AlarmCAD* > > > > Book appointment time in my calendar > > https://calendly.com/t_mack_mepcad > > ------------------------------ > *From:* Rick Matsuda <[email protected]> > *Sent:* Saturday, February 18, 2023 1:23:12 PM > *To:* [email protected] <[email protected]>; Discussion list on issues relating > to automatic fire sprinklers <[email protected]> > *Subject:* [Sprinklerforum] Re: Once upon a grid... > > 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 <[email protected]> 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 <[email protected]> > <[email protected]> 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 *[email protected] > > *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 > [email protected] > > > _________________________________________________________ > SprinklerForum mailing > list:https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] > > > -- > > > > *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 > [email protected] > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected] -- Greg McGahan *Genesis Fire Services, LLC* *4912 Glover Lane. Milton, FL **32570* *P- 850-637-8535* *C- 850-712-9555*
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