Here is how I see the argument If you pipe the sprinkler with a smaller diameter line then that sprinkler has to be part of your hydraulic calculation (arguably you could just switch to the sprinkler below the obstruction and remove the sprinkler above the obstruction, as you are not required to calculate both but you have to calculate the most demanding) If you pipe the sprinkler with the same diameter line then there is no additional calculations required Piping under obstructions after design is already done it's just simpler to pipe the additional sprinkler with the same pipe diameter but if you know of the obstructions beforehand and include them in the initial calculations then you could pipe them with whatever works in the calculations.
Thanks Brett Peters General Manager Installation & Design Proudline Fire Protection Services Ltd. br...@proudline.ca 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 m...@proudline.ca for more information On Tue, Aug 23, 2022 at 1:34 PM Fpdcdesign <fpdcdes...@gmail.com> wrote: > What I have is an ESFR system where i need to add a single sprinkler in 2 > locations under ducts. 23.4.4.7.3.1 states that sprinklers under > obstructions do not need to be included in hydraulic calculations. > 23.4.4.7.3.2 states that if the sprinklers are under obstructions are piped > with the same size branch piping, additional calculations under > obstructions are not required. I’m assuming that the difference is that > the first one is based on one or two sprinklers under obstructions in > isolated location. The other is if enough sprinklers are installed under > obstructions to create an new calculation area. Neither really address any > restrictions on pipe sizes for sprinklers under obstruction. > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860-535-2080 (ofc) > 860-554-7054 (fax) > 860-608-4559 (cell) > > > On Aug 23, 2022 at 12:35 PM, <Derrek Crigler <der...@adfiresprinklers.com>> > wrote: > > NPFA 13 2016 23.4.4.7.3.2 > > > > *From:* Fpdcdesign <fpdcdes...@gmail.com> > *Sent:* Tuesday, August 23, 2022 9:30 AM > *To:* Discussion list on issues relating to automatic fire sprinklers < > sprinklerforum@lists.firesprinkler.org> > *Subject:* [Sprinklerforum] Re: Sizing of pipe below obstructions > > > > Brett, any specific reference for that? > > > > > > > On Aug 23, 2022 at 12:21 PM, <Brett Peters <br...@proudline.ca>> wrote: > > Typically non storage sprinkler supplied with 1" > > Storage type sprinkler supplied with same size as branch line (typical for > ESFR sprinklers) > > > > Thanks > > > > Brett Peters > > General Manager Installation & Design > > Proudline Fire Protection Services Ltd. > > br...@proudline.ca > > 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 > m...@proudline.ca for more information > > > > > > > > > > > > > > On Tue, Aug 23, 2022 at 10:09 AM Fpdcdesign <fpdcdes...@gmail.com> wrote: > > > > > > Todd G Williams, PE > > Fire Protection Design/Consulting > > Stonington, CT > > 860-535-2080 (ofc) > > 860-554-7054 (fax) > > 860-608-4559 (cell) > > > _________________________________________________________ > 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 > > _________________________________________________________ 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
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