Bill, Have you looked at 12.1.3.4.1 and A12.1.3.4.1? I have always been under the assumption that 20 feet clear above the top of storage was the max.
Ron Fletcher Aero Automatic Phoenix, AZ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bill Brooks Sent: Wednesday, February 16, 2011 6:42 PM To: [email protected] Subject: Rack Storage Sanity Check (13-2010) Figure 17.2.1.2.1(d) shows my situation - Group A plastics, four tier double row racks, but 23 (twenty three) ft ceiling clearance. I'm assuming one level of in-racks below the top tier is necessary based on 12.1.3.4.4, with in-racks spaced at 5 ft based on bottom right Figure 17.2.1.2.1(d). If this is an acceptable arrangement it looks like the Group A plastic protection could be less demanding than encapsulated Class IV for this configuration if you discount the differences in the spacing of the in-racks for each case. Is this because the encapsulated Class IV commodities can be a greater fire hazard than the cartoned (or exposed unexpanded) plastics? Am I missing something really big with respect to ceiling clearance and Group A plastics? I know you just can't do ESFR when ceilings are too high, but are Group A plastics similar? Bill Brooks William N. Brooks, P.E. Brooks Fire Protection Engineering Inc. 372 Wilett Drive Severna Park, MD 21146-1904 410-544-3620 410-544-3032 FAX 412-400-6528 Cell _______________________________________________ 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)
