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 (tel:860-535-2080) (ofc) 860-554-7054 (tel:860-554-7054) (fax) 860-608-4559 (tel:860-608-4559) (cell)
> > On Aug 23, 2022 at 12:35 PM, <Derrek Crigler > (mailto:[email protected])> wrote: > > > > > > NPFA 13 2016 23.4.4.7.3.2 > > > > > > > > > > From: Fpdcdesign <[email protected]> > Sent: Tuesday, August 23, 2022 9:30 AM > To: Discussion list on issues relating to automatic fire sprinklers > <[email protected]> > Subject: [Sprinklerforum] Re: Sizing of pipe below obstructions > > > > > > > > > > > Brett, any specific reference for that? > > > > > > > > > > > > > > > > > > > > > > > > On Aug 23, 2022 at 12:21 PM, <Brett Peters (mailto:[email protected])> > > 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. > > > > > > > > > > > > [email protected] (mailto:[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 (http://www.proudline.ca/) > > > > > > > > > > > > > > > > > > > > > > > > > > Proudline now offers ULc listed monitoring services, please contact > > [email protected] (mailto:[email protected]) for more information > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Tue, Aug 23, 2022 at 10:09 AM Fpdcdesign <[email protected] > > (mailto:[email protected])> wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Todd G Williams, PE > > > > > > > > > > > > > > > Fire Protection Design/Consulting > > > > > > > > > > > > > > > > > > Stonington, CT > > > > > > > > > > > > > > > > > > 860-535-2080 (tel:860-535-2080) (ofc) > > > > > > > > > > > > > > > > > > 860-554-7054 (tel:860-554-7054) (fax) > > > > > > > > > > > > > > > > > > 860-608-4559 (tel:860-608-4559) (cell) > > > > > > > > > > > > > > > > > > > > > > > > > > > _________________________________________________________ > > > SprinklerForum mailing list: > > > > > > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > > > To unsubscribe send an email to > > > [email protected] > > > (mailto:[email protected]) > > > > > > > > > > > > > > _________________________________________________________ SprinklerForum > > mailing list: > > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > > To unsubscribe send an email to > > [email protected] > > (mailto:[email protected]) > > > > > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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