I told you about the heads we found with caulked on cover plates 2" below
the cup didn't I?
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "George Church" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, October 31, 2007 2:42 PM
Subject: RE: Clean room sprinkler heads w/ covers
Not to mention the adhesive tendency of a silicone caulk which could let
the
solder on the plate melt, but hold it from dropping. Talk about an
obstruction to spray!
glc
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Sal Izzo
(TECH- 103)
Sent: Wednesday, October 31, 2007 2:11 PM
To: [email protected]; [email protected]
Subject: RE: Clean room sprinkler heads w/ covers
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
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