If it's over 18" why would you be looking at the floor mounted rules? Aren't these rules to allow an exception to the general rule to keep things out of the zone 18" below the deflector? And yes the exception is only for LH. Clearance to storage...18", obstructions that prevent the discharge from reaching the hazard...18". Go to the library stack section, again 18". So I think you are fine down to 18" above the top of the wall.
On the clg. not sure I would have even questioned 6" x 6" open grate with 1/8" wire. The rules as supported by the annex are intended to concern them selves with horizontal flow of water. Even if you were 18" above this "clg" I don't think this is what the open grid clg rules are a concerned with. But even applying the rules you comply so it's a moot point. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Gregg Fontes Sent: Tuesday, February 09, 2010 5:21 PM To: [email protected] Subject: Floor Mount Vertical Obstructions Scenario, mini storage with multiple 10' x 10', 10' x 8' and so on cubicles with partitions stopping at 8'-0 with a 6" x 6" open grate/wire 1/8" diameter fence ceiling at 8'-0. Existing calculated ordinary hazard group II, .20 gpm over 1500 sq. ft. with upright fire sprinklers at 10' x 12' spacing. Existing upright fire sprinkler deflectors are at 13'-6, placing them 5'-6 above the 6" x 6" open grate/wire ceiling. NFPA 13 2007 8.6.5.2.2 addresses floor mount vertical obstructions for light hazard only. NFPA 13 2007 8.14.12 addresses open-grid ceilings. Since the sprinkler deflector is greater than 36" above the open grated/wire ceiling, the existing system is in compliance 8.14.12. However, since NFPA 13 dose not address the vertical obstructions for ordinary hazard in this situation, the vertical partitions would be an obstruction. Therefore, the existing upright fire sprinkler spacing would need to be modify to either place the sprinkler directly over the partition or over each cubical. In other words, you could not ignore the vertical partition in this situation. Am I looking at the correct? Thanks, Gregg Fontes Cen-Cal Fire Systems, Inc. 209-334-9119 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
