12 total
On 8/12/2010 1:40 PM, Matthew J. Willis wrote:
Oh he will use fire in some way, guaranteed.
Greg, was this a total 12 sprinklers in the bag? Or 12 of the (x) number
fused?
R/
Matt
Matthew J. Willis, CET
Automatic Fire Sprinklers
Norred Fire Systems L.L.C.
318-387-1134 Voice
318-816-1087 Mobile
318-387-1163 Facsimile
[email protected]
-----Original Message-----
From: [email protected] [mailto:sprinklerforum-
[email protected]] On Behalf Of Reed Roisum
Sent: Thursday, August 12, 2010 1:18 PM
To: [email protected]
Subject: RE: heads in plastic bags
I bet Cahill has already begun his experiment...although I'm sure he is
disappointed that he doesn't get to set fire to anything on this one.
Reed A. Roisum, CET
Ulteig Engineers, Inc.
-----Original Message-----
From: [email protected] [mailto:sprinklerforum-
[email protected]] On Behalf Of Matt Grise
Sent: Thursday, August 12, 2010 1:09 PM
To: '[email protected]'
Subject: RE: heads in plastic bags
Perhaps the box allows some of the hot air to escape? The bag would
certainly allow radiative and convective heat into the package faster
than the cardboard. If the bag was in the sun, the radiation would be
allowed to directly heat the heads and elements. Add the trapped hot air
and maybe it is enough...
Matt Grisé PE*, LEED AP
Sales Engineer
Alliance Fire Protection
*Licensed in KS& MO
913.888.0647 ph
913.888.0618 f
913.927.0222 cell
www. AFPsprink.com
-----Original Message-----
From: [email protected] [mailto:sprinklerforum-
[email protected]] On Behalf Of Greg McGahan
Sent: Thursday, August 12, 2010 1:05 PM
To: [email protected]
Subject: Re: heads in plastic bags
I heard years ago from a 30 yr man that if you put heads in a ziploc
plastic bag that the heads would fuse when it is hot, but he had never
seen them fuse in or out of a box otherwise. We just had 12 heads fuse
in a ziploc bag with the plastic caps still in place in an enclosed
building under construction. It is a mystery to me, the glass was in the
bag, there are no marks on the heads, they are just fused. It is hot
here - 103 ish - but not that hot.
I also have never seen heads fuse in the back of a truck etc around
here, but these have.
Thanks
On 8/12/2010 12:53 PM, Ron Greenman wrote:
Why would heat transference into and out of a plastic bag be different
than the same regarding a box except for time lag? Now if directly in
the sun you'd get more radiant impingement quicker through the plastic
bag, if clear but I doubt if it would be significant. I think people
tend to equate how they "feel" regarding their own ability to regulate
their body temperature with heat on inanimate objects. Consider the
concept of one blanket or coat being "warmer" than another or that it
is "cooler" in the shade or when sitting in front of a fan. Is it the
insulating properties of the one blanket over the other relative to
your ability to produce heat or to some inherent quality of "hotness"
in the blanket (electric blankets notwithstanding)? Or is the breeze
from the fan wicking away your sweat quicker than evaporation by
itself causing you to lose heat quicker and thereby feeling cooler?
How about in the shade? Is the ambient air cooler or are you just not
being impinged on by both convection and radiation rather then just
the former? So put heads in the direct sun, in an environment where
heat in is faster than heat out and maybe, but I gots to think it
would have to be in Death Valley or somewhere equivalent.
On Thu, Aug 12, 2010 at 10:17 AM, Greg McGahan<[email protected]>
wrote:
Anybody ever heard that if you put sprinklers in plastic bags that it
can
cause them to fuse when heads in boxes won't - from heat inside trucks
etc?
Thanks,
Greg
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