I was trying to be logical about the obstructions in the inner core discharge, which FM are so concerned with. Having a ‘cross’ of two 100mm wide obstructions seems totally untenable.
You can’t put a Pendent ESFR over a 100mm wide bottom chord so the only difference with an Upright is the Range Pipe and the yoke shadow. Cheers, Russell Gregory Christchurch New Zealand From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, 28 March 2017 3:41 PM To: [email protected] Subject: Re: Am I reading this right? If what you are saying is true, and I'm not questioning your statement, then this condition would not allow the lower obstruction to be the bottom chord of a steel bar joist or open web wood joist because the range pipe would need to be centered in the web of the joist and parallel to the joist, a physical impossibility. The obstruction would have to be something other than a structural member. Is this your experience? Mark at Aero 602 820-7894 Sent from my iPhone On Mar 27, 2017, at 7:05 PM, Russell & Carol Gregory <[email protected]> wrote: Because an Upright ESFR sprinkler can be connected directly to a Range Pipe of up to 100mm NB thus it is tested with an obstruction to core discharge. The Upright ESFR sprinkler must have the yoke arms aligned with the Range Pipe therefore the obstruction is in the shadow area from the yoke arms. Accordingly another obstruction of up to 100mm wide may be positioned below the Upright ESFR, PROVIDING it is directly below the Upright ESFR and is ALIGNED with the Range Pipe. If it is other than directly below and parallel with the Range Pipe then it is not permitted within the Core so must be at least 300mm away from below the Upright ESFR. I have seen it stated that Upright ESFR are more tolerant of obstructions to Core Discharge but I believe this is not the case as the arrangement must be as I have described. Regards, Russell Gregory Christchurch New Zealand From: Sprinklerforum [mailto:[email protected]] On Behalf Of Vince Sabolik Sent: Monday, 27 March 2017 11:53 PM To: [email protected] Subject: Am I reading this right? NFPA 13, 2013 8.12.5.3.2.1 The requirements of 8.12.5.3.2 shall not apply where upright sprinklers are located over the bottom chords of bar joists or open trusses that are 4 in. (102 mm) maximum in width. Does this mean that an upright ESFR can be at or near center of a bar joist? Thanks, Vince <image002.jpg> 11351 Pearl Road / Suite 101 Strongsville, Ohio 44136 Phone 440 238-4800 Fax 440 238-4876 Cell 440 724-7601 Vince Sabolik _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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