See NFPA-33 (2007 edition), paragraph 9.4.6...a new requirement. You must calculate for 30-gpm from the sprinkler protecting the stack.
rick matsuda city of dallas -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ryan Hinson Sent: Wednesday, August 27, 2008 12:38 PM To: [email protected] Subject: Small orifice sprinkler use in paint booth exhaust duct Can I use a small orifice head in the exhaust stack of a paint booth in lieu of 11.2K heads that are in the rest of the booth 14' below to balance the calcs? A larger orifice head draws too much water to make the calcs workable. NFPA 13(2002) 8.3.4 alludes only to explicitly allowable use in light hazard occupancies on wet systems. Does this head have to be an upright at the top of the stack(which is 4' in diameter, vertically oriented, and about 11' in length with a rain cover over the top), or can it be a SDWL installed in the middle or near the bottom? The required location this head is driving the whether this system can be wet or not. Thank you, Ryan L. Hinson, Nicet III Design Manager Fire Construction Design Services, LLC #C124 A Division of Fire Construction Services, Inc. 6950-43rd Avenue SE St. Cloud, MN 56304 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
