I satisfied my goofy curiosity "which will activate first, a 155F Standard Response or a 200F Quick Response"? And the winner is... BOTH !, depending on Ceiling Height. At C.H.= 13'-1 1/2" the 200F QR blew at 24.0 sec. The 155F SR at 26.3 sec. At C.H.= 19'-8" the 155F SR popped at 29.2 sec. The 200F QR at 30.9 sec. The reason is, RTI is established using empirical measurements of the temperature and velocity of the air-- the temp falls like a rock with greater horizontal dist from the fire, where-as the velocity varies with ceiling height.
I was going to title this thread "well i'll be a monkey's uncle" for having bad-mouthed NFPA #13 regarding the QR Reduction at 20 Feet Glitch Q__o. For both scenarios I used a 2 megawatt fire, and the heads were 6'-7" from the center of the plume, with a floor and ceiling only (no walls). Brad Casterline, NICET IV Fire Protection Division FSC, Inc. P: 913-722-3473 bcasterl...@fsc-inc.com www.fsc-inc.com Engineering Solutions for the Built Environment -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120614/5048f562/attachment.html> _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
