The intent is to calculate the 4 most demanding sprinklers that would activate in a single fire event, therefore we tend to submit the version that reflects that scenario but we typically prove the calcs for our sake.
On Thu, Jul 20, 2023 at 11:07 AM Brett Peters <[email protected]> wrote: > LOL, unfortunately I have someone arguing that it can be done the other > way because "those heads have a larger area of coverage". > In my opinion they are twisting the definitions of "adjacent" and > "hydraulically most demanding" to include the sprinklers that cover the > largest area but in my opinion the largest floor space doesn't > necessarily present as the most demanding. > > I will be on Holidays from August 12th to 21st, returning to work on > Tuesday August 22nd > > Thanks > > Brett Peters > General Manager Installation & Design > Proudline Fire Protection Services Ltd. > [email protected] > 780 490 7602 office ext 202 > 780 490 7605 fax > 780 777 0568 cell > 780 718 2676 24h > Visit us at www.proudline.ca > > Proudline now offers ULc listed monitoring services, please contact > [email protected] for more information > > > > > > > On Thu, Jul 20, 2023 at 9:31 AM Chris Dorn < > [email protected]> wrote: > >> Brett, >> >> I think you answered your own question. “I always choose whatever gives >> me the greatest pressure loss not necessarily the larger flow.” Wouldn’t >> that by definition be the hydraulically most demanding area regardless of >> location? It’s exactly what I do also in this situation. >> >> Chris Dorn >> >> >> >> >> >> >> >> *From:* Brett Peters <[email protected]> >> *Sent:* Thursday, July 20, 2023 11:15 AM >> *To:* Sprinklerforum <[email protected]> >> *Subject:* [Sprinklerforum] Residential Design in NFPA 13 >> >> >> >> Having a debate on which sprinklers actually have to be part of the >> hydraulic calculation in a residential unit in a 13 building (So the >> calculation has to include 4 sprinklers) - NFPA 13, 2013 >> >> >> >> 11.3.1.1* The design area shall be the area that includes the four >> adjacent sprinklers that produce >> >> the greatest hydraulic demand. >> >> >> >> With 11.3.1.1 in mind if you have a space where you have less than 4 >> sprinklers in a compartment and you have to start adding sprinklers in >> other compartments to come up with 4 in the calculation, what is the method >> that you have to use? >> >> So for arguments sake this scenario is 2 sprinklers in one compartment >> and then two "adjacent" sprinklers outside of that compartment but there >> are sprinklers in different directions that can be considered as "adjacent" >> >> 1. Adding sprinklers from the next compartment on a different >> sprinkler line which would qualify as an "adjacent sprinkler" and >> potentially have 4 sprinklers fed form 3 different lines or >> 2. adding "adjacent sprinklers" that are first on a common sprinkler >> line and potentially having 3 sprinklers on a single line. >> >> My argument is that scenario 2 has to be followed as that would produce >> the largest demand to a sprinkler line and if required increase the size of >> that line. >> >> The other argument is that in scenario 1 they are picking the "adjacent >> sprinkler" that has a larger protection area, so the actual water flow >> might be slightly higher but it spreads the flow through 3 different lines >> instead of only 2 >> >> >> >> So scenario 1 has more flow but less pressure loss resulting in smaller >> piping and scenario 2 has less flow but more pressure loss requiring larger >> pipe to be installed. >> >> >> >> So what are other people doing in these situations and what is really >> considered as producing the greatest hydraulic demand? I always choose >> whatever gives me the greatest pressure loss not necessarily the larger >> flow. >> >> >> >> I will be on Holidays from August 12th to 21st, returning to work on >> Tuesday August 22nd >> >> >> >> Thanks >> >> >> >> Brett Peters >> >> General Manager Installation & Design >> >> Proudline Fire Protection Services Ltd. >> >> [email protected] >> >> 780 490 7602 office ext 202 >> >> 780 490 7605 fax >> >> 780 777 0568 cell >> >> 780 718 2676 24h >> >> Visit us at www.proudline.ca >> >> >> >> Proudline now offers ULc listed monitoring services, please contact >> [email protected] for more information >> >> >> >> >> >> >> >> >> >> _________________________________________________________ >> 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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