The gap between the cover plate and the skirt does contribute to preheating the thermal element prior to the cover plate falling off. Even with the gap covered with the gasket, however, the operation of the sprinkler still falls within the standard response time criteria when subjected to room heat sensitivity testing. Therefore, the gasket is listed with the sprinkler, whereas varying thicknesses of any type of caulk sealant used by an installer or building owner to seal the gap is not. Regards, Salvatore J. Izzo, P.E. Manager - Reliable Technical Services
________________________________ From: [EMAIL PROTECTED] on behalf of Ed Kramer Sent: Wed 10/31/2007 14:22 To: [email protected] Subject: RE: Clean room sprinkler heads w/ covers It doesn't answer your question, but I noticed that for a least one of the manufacturers, if the air/dust seal is used, the sprinkler is no longer quick response. A bit of an issue in light hazard occupancies. Ed Kramer Littleton, CO >Interesting: The cut sheet on the sprinkler has the following in it: > >When properly installed, there is a >nominal 3/32 inch (2,4 mm) air gap >between the lip of the Cover Plate and >the ceiling, as shown in Figure 2. This >air gap is necessary for proper operation >of the sprinkler. > >They then go on to seal this gap with the air and dust seal. > >I was under the impression that the gap was critical for the proper >operation of the sprinkler, but this doesn't seem to be the case. This >same condition exists for the Reliable. > >Can someone explain why this gap is not required when the seal is >applied, but is required otherwise. > >Thanks > >Pete >VA _______________________________________________ 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) _______________________________________________ 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)
