Go try a photoelectric smoke detector and a flaming fire. The sprinkler
will go first in many. I've lit a lot of fires and the detector can take up
to 5 minutes.
Go find the local FD training center. Get a couch and put a head and smoke
detector above your head while sitting on one end of the couch. Light a
good flaming fire on the other end. I'm sure you'll agree the sprinkler
going first has MUCH more use to the occupant (i.e. you). I've done it many
times, you'll be fine.
Chris Cahill, P.E.
Fire Protection Engineer
Sentry Fire Protection, Inc.
763-658-4483
763-658-4921 fax
Email: [EMAIL PROTECTED]
Mail: P.O. Box 69
Waverly, MN 55390
Location: 4439 Hwy 12 SW
Waverly, MN 55390
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, December 21, 2006 9:59 AM
To: [email protected]
Subject: RE: both QR & SR sprinklers
Well I can see that happening in some cases, guess it depends on the
type of incident, fuel loading and such. But if the sprinkler goes
first at the elevated temperature, that's not much use to the occupant.
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.lg.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Matthew
J. Willis
Sent: Thursday, December 21, 2006 10:48 AM
To: [email protected]
Subject: RE: both QR & SR sprinklers
I would offer Craig, in demonstrations I have conducted, and others I
have seen, the sprinkler went off Well before the detector.
Matt
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, December 21, 2006 10:45 AM
To: [email protected]
Subject: RE: both QR & SR sprinklers
George, what in the difference between an SR and QR makes you say that
the SR won't provide much "Life Safety"? How much difference in
response time can you measure between the two?
Quite honestly the smoke detector in the room will be the thing that
saves the life of the occupant more so than the sprinkler head. If it's
a 155 or even a 135 degree head, by the time the sprinkler activates,
the occupant is already cooked. The sprinkler is more to control the
spread of fire and allow evacuation of adjacent areas before the fire
can spread and block exits.
But granted, if the QR will give a few more seconds for evacuation then
I'd certainly prefer to use them. But if the code allows SR and the
owner is worried about $$$$$ you might be in for a hard sale. Those who
write the checks are more concerned about what's the minimum than what
gives the best protection.
(For those sensitive individuals, Sorry for be so graphic)
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.lg.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of George
Church
Sent: Thursday, December 21, 2006 10:05 AM
To: [email protected]
Subject: RE: both QR & SR sprinklers
My response was simply aimed at the fact that a SR head won't give much
Life Safety to the poor SOB in the hotel room but a QR will.
If our aim is to save lives and property from fire, QR was the only
answer.
We have the tools, let's use them whenever we can to this aim.
George Church
Rowe Sprinkler
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of rod
Sent: Wednesday, December 20, 2006 11:25 AM
To: [email protected]
Subject: RE: both QR & SR sprinklers
Well that is interesting Todd. There is some ambiguity here for sure. I
guess at the end of the day what I am looking at with this issue is that
although the word "only" doesn't appear it is only the standard response
head that is addressed with those two exceptions and in many cases with
our standards they can't rule out every scenario but rather spell out
how to perform and then give exceptions to those rules. This addresses
Ed's comments on the fast response also. True that it doesn't say that
you can't but I would submit that it doesn't say that you can and I
believe that the intent is to NOT mix heads with the same thermal
sensitivity within the same compartment. Interesting that I looked at
101 and the same wording is there; except that it refers to the same
smoke compartment. This would be even more restricting in life safety
applications where a smoke compartment would likely entail many rooms
rather than just this one room that we are talking about. Interesting
thread for sure.
Rod DiBona
Rapid Fire
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