As I recall a big part of the reason that the "Window" sprinkler was so special was that the rated wall test requires the impact of the fire hose water on the structure after the fire has burned some specific amount of time. 100 Psi cold water hitting glazing that is even hot in only a few spots will shatter. The window sprinkler was able to wet the entire window surface evenly and dissipate the heat, so when the cold hose water hit it, nothing happened.
Now the "Window sprinkler" is an alternate to 2Hr. rating, but in the situation described, it would appear the school is a fully sprinklered structure, so under the building code they may have reduced the ratings down to 1 hour. Unfortunately that really doesn't help here, as there is no approved alternative sprinkler application that is equal to 1 hour rating either. The cost of testing and such to get a = to 1 Hr. is prohibitive. Maybe TYCO can do "Window Sprinkler Lite" for 1 hr rated wall assemblies? Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Leyton Sent: Tuesday, September 30, 2008 9:38 AM To: sprinklerforum@firesprinkler.org Subject: RE: Window Sprinklers The Tyco tests very conspicuously did not, nor does the listing include doors or moving casement windows. Fixed glass only, no horizontal mullions or bumps. The obvious being that the intent is to cool the glass and maintain separation, not water an opening in hopes of keeping fire and combustion byproduct from breaching it. Steve Leyton Protection Design & Consulting San Diego, CA _______________________________________________ Sprinklerforum mailing list http://lists.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)
