Allan, Cloud-no-steel (unobstructed construction):
DEVICE Activation Times 1 CLOUD1 No Activation 2 CLOUD2 No Activation 3 CLOUD3 No Activation 4 CLOUD4 139.6 s 5 CEILING1 93.4 s 6 CEILING2 94.7 s 7 CEILING3 93.3 s 8 CEILING4 94.5 s Cloud-steel (obstructed construction): DEVICE Activation Times 1 CLOUD1 No Activation 2 CLOUD2 No Activation 3 CLOUD3 136.6 s 4 CLOUD4 No Activation 5 CEILING1 No Activation 6 CEILING2 No Activation 7 CEILING3 No Activation 8 CEILING4 No Activation the description is: &HEAD CHID='cloud', TITLE='8 ft ceiling, 9.375 gap, cloud cross fast fire, baseline activation'/ This is a 30'x30' room with (4) clouds with equal gaps all around and between clouds and the fire in the middle. CLOUD1 through CLOUD4 are pendents centered in the clouds and CEILING1 through CEILING4 are uprights directly above. for Cloud-steel, there are (5) 16" deep beams at 5' C-C. The 'plenum' space is 24" deep. The reason I think Dr. Floyd called this 'baseline activation' is because this set-up allows more of the plume to go up the gap. Since the main criteria is that the plume activate the cloud sprinklers and not the hot layer, and if his recommendations were accepted as a ..."reasonable degree of protection"..., the uprights would not be required, in fact they might even cause a big mess and delay or prevent the pendent from activating! To boil this whole thing down to a Standard it makes sense to tie max gap width to ceiling height. I have not checked the graphics or spread sheets yet but the only difference I would guess between obstructed and unobstructed construction above the clouds is a slight increase in the surface temperature on the top side of the clouds. Regards, Brad _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
