As I understand it, the Table is based on test data using ½ and large orifice sprinklers, which don’t always give the best results against high piled storage, so that could explain some of the inconsistencies.
Having said that though, it looks to me that Column C is generally less demanding than Column E. ie. For 20 ft storage in a 25 ft high building, Col. C wants a 0.60 density whereas Col. E wants 0.70. Best regards, Larry Keeping From: Sprinklerforum <[email protected]> On Behalf Of Dewayne Martinez Sent: May-20-19 2:50 PM To: [email protected] Cc: Dewayne Martinez <[email protected]> Subject: NFPA 13 (2013ed) figure 15.2.2 Group A plastics, 5-12ft of storage, 15 to 20ft ceiling Figure 15.2.2 / table 15.2.6(a) Why is Group A, Expanded, Cartoned, Stable (Column E) less of a hazard then Group A, nonexpanded, stable, cartoned (Column C)? One would think that since the expanded has a higher heat release rate so it would be higher density. Can anyone help me understand this? Thanks, Dewayne Martinez Fire Protection Design Manager TOTAL Mechanical Building Integrity W234 N2830 Paul Rd. Pewaukee, WI 53072 [email protected]<mailto:[email protected]> Ph: 262-522-7110 Cell: 414-406-5208 http://www.total-mechanical.com/ [cid:[email protected]]
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