There is a very, very, very small amount of situations where you need to calculate the high sprinkler heads with the low sprinkler heads (under the mezzanine).
If there is a large opening to the floor above, it would depend on how it is zoned. If the they are the same zone then you may need one (which is the case a lot of times because of fire alarms). If they are 2 different zones, then no you wouldn't need a calculation. Be careful about large openings in the floor above, usually you need a water curtain around those (unless a shaft enclosure is not required and sprinklers are not what's keeping it from being required). You would not need to calculate the sprinkler obstructions with the high sprinklers unless specifically instructed to do so by a code section. You may need to run a calculation with the low sprinklers and the sprinkler heads under the obstructions. This of course really depends on the height differences, layout, number of sprinklers, etc. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, March 20, 2014 10:23 AM To: [email protected] Subject: Sprinklers under mezzanine Gentlemen, NFPA 13 par. 23.4.4.6.3 states: The requirements of 23.4.4.6.1.1 to include every sprinkler in the design area shall not apply where spray sprin- klers or CMSA sprinklers are provided above and below ob- structions such as wide ducts or tables. Question: Does the same apply to sprinklers underneath mezzanines? And how about sprinklers under a floor with a large opening to the (sprinklered) floor above? And how when the large opening is filled with obstructions (pipe rack) with additional sprinklers underneath the obstructions? Looking forward to your insight.... Best regards, Frans Stoop TOS architecture & fire protection Netherlands <[email protected]> Tel. +31-24-324 0112 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
