I will confess that I have never done a High-X system, but with the
relative small size of the building, the racking and the arrangement
of exits, I would be concerned from a life-safety standpoint about
it. If we use the pre-primed design, we would be OK with the water
supply. With the standard arrangement, we are right at the maximum
point that the water company will allow.
At 06:41 PM 2/11/2008, you wrote:
Have you considered High-X foam if your water supply is challenged?
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message ----- From: "Todd Williams - FPDC" <[EMAIL PROTECTED]>
To: <sprinklerforum@firesprinkler.org>
Sent: Monday, February 11, 2008 3:48 PM
Subject: RE: pre-primed foam system.
Chemical storage warehouse.
At 04:53 PM 2/11/2008, you wrote:
Check with your foam supplier on the life of the foam. Not all will
last 3 years and life span can depend on the water quality too.
Again check with the supplier on the galvanized. Some of the foams
react with Galvanized at certain concentration levels. Usually it's not
a problem for foam-water systems as the foam isn't in the pipe for a
long duration of time.
Also don't forget to check about containment. In some jurisdictions this
type of discharge has to be contained and removed as hazardous waste.
What are you trying to protect?
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 Todd
Williams - FPDC
Sent: Monday, February 11, 2008 4:40 PM
To: sprinklerforum@firesprinkler.org
Subject: pre-primed foam system.
I am designing a foam system to be fed from a limited volume public
water supply. NFPA 16 mentions a pre-primed foam system with significant
decreases in demand. I spoke to someone who knows foam and he said that
the system is filled with the foam-water mixture instead of just water
(and the foam mixed in at the riser). The biggest problem being that the
mixture breaks down over time, so it ends up as pretty much dirty water.
My questions are this: Has anyone worked with this type of system
before? I was thinking recommending a three year pre-priming schedule,
does this make sense? If the pipe is going to contain a mixture
full-time, should it be galvanized? The difference in using could be
the difference between a pump and tank for a 12,000 sqft warehouse.
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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