Yes - my ASSUMPTION was that we had adequate coverage by the pendent sprinklers; and the sidewalls were in a relatively small pocket(s), which seems logical if the pendants covered the floor below properly. Given that scenario, I took the sidewall's purpose to be limited to: providing sprinklers within 12 in. of the ceiling within the pockets (or 4 to 6 in. in this case), and reducing any delay in sprinkler activation.
If they are incapable of controlling the fire, no problem, the adjacent pendent heads will do that; in a relatively small pocket, I would expect the sidewall activation to quickly drive the heat plume outside the pocket and activate the pendant heads. Admittedly, this is all theoretical. But what's the worst case scenario? How long could a fire grow before activating the pendent sprinklers adjacent to the pockets? Again, these are relatively small pockets whose floor areas are adequately covered by the Ex Haz pendent sprinklers below. Mark A. Sornsin, PE Fire Protection Engineer Ulteig Engineers, Inc. Fargo, ND 701.280.8591 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Cliff Whitfield Sent: Thursday, April 17, 2008 2:02 PM To: [email protected] Subject: RE: Extra Hazard Ceiling Pockets Fellow forumites, I guess I need to back up and expand my comments a little. When I said that I agree with Mark, I was trying to say that if what Mark described in his comments about the head spacing (which none of us know for sure except John) was accurate, and the pendant heads indeed provided adequate coverage for the EH occupancy, then I believe that the sidewall heads should not adversely affect the coverage for the room. I had envisioned a fairly small room with 4 to 6 heads at the lower ceiling and the ceiling pocket being something like an 8 x 12 area above the table. (The problem is, since we don't have a "picture" of what John is describing, it could be a 3000 sf room with a small ceiling pocket). If it is similar to what I envisioned, this seems like a case where 13 can't possibly cover ever known scenario and some sound engineering judgment needs to be made. (Which I can't actually do since I am not an engineer and don't play one on TV). Maybe someone on the forum with a modeling program could get the actual layout from John, run a model and let us know what the results are. Cliff Whitfield, SET Fire Design, Inc. _______________________________________________ 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)
