Craig:
I wasn't saying a pre-action sprinkler system instead of a wet pipe system.
My preference is a wet system with independent smoke sensors tied to the
fire alarm system. The only time I use pre-action is when the owner is
the nervous type.
Otherwise, the water damage can be greater due to potential operation of
more heads due to the operational delay.
Regards,
James L.(Jim) Roberts, PE, SET
Fluor Corporation
100 Fluor Daniel Drive - C104F
Greenville, SC 29607
864.281.5149
864.281.4916(Fax)
<[EMAIL PROTECTED]>
Sent by:
[EMAIL PROTECTED]
To
prinkler.org
<[email protected]>
08/23/2007 11:07 AM
cc
Please respond to
sprinklerforum
Subject
RE: Carbon Dioxide
System Discharge Time
Can the room be occupied at any time either by service personnel or
other occasional operators? Typically the answer would be yes as all
equipment needs human intervention at some time.
What Jim is saying is that a Pre-action sprinkler system would actually
be the best choice and the most cost effective with something like
FM-200 as the next choice instead of CO2. There are some serious life
safety issues you must consider when using CO2 in potentially occupied
spaces.
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 Reza
Esmaeili
Sent: Thursday, August 23, 2007 10:59 AM
To: [email protected]
Subject: Re: Carbon Dioxide System Discharge Time
Jim,
I forgot to explain, the room doesn't have any operators at all, and
carbon dioxide is the best choice.
Thanks,
Reza
[EMAIL PROTECTED] wrote:
Reza:
I would not recommend a CO2 system as it is potentially too dangerous. I
would consider a clean agent sytem per NFPA 2001.
Hopefully, this is only a back-up to a wet pipe system, which is still
my favorite.
Regards,
James L.(Jim) Roberts, PE, SET
Fluor Corporation
100 Fluor Daniel Drive - C104F
Greenville, SC 29607
864.281.5149
864.281.4916(Fax)
Reza Esmaeili
Sent by: To
[EMAIL PROTECTED] [email protected]
prinkler.org cc
08/23/2007 10:18 AM
Please respond to Subject
sprinklerforum Carbon Dioxide System Discharge Time
Hi all,
For designing a total flooding high pressure carbon dioxide system in a
3,500 cubic feet computer room with electrical equipment and cable runs,
I have specified my room as "Dry electrical hazard" with flooding factor
of
0.083 lb/cubic.feet and 50% design concentration according to NFPA-12.
My questions are as below:
1)- Is a computer room fire a deep seated fire?
2)- NFPA 12 states that "For deep-seated fires, the design concentration
shall be achieved within 7 minutes, but the rate shall be not less than
that required to develop a concentration of 30 percent in 2 minutes." Is
it a problem if the total discharge time would be only 1 minute for this
case?
Many thanks for your help in advance.
Reza
---------------------------------
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