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 Post subject: Freeze Hazard?
PostPosted: Sun Jan 14, 2018 5:36 pm 
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Joined: Mon Apr 26, 2010 10:21 am
Posts: 136
Here in Atlanta, it rarely gets cold enough long enough, but the prolonged frigid weather this year has me worried about the AFFF fire system in the race car stored in an unheated garage. Does anyone know how vulnerable to freezing the water-based solution in the fire bottle would be?


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 Post subject: Re: Freeze Hazard?
PostPosted: Sun Jan 14, 2018 5:50 pm 
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Joined: Fri Apr 13, 2012 6:16 pm
Posts: 9
I had my car in an insulated garage with no heat, in MN and everything was ok. It was a milder winter though. Do you have an old style trouble light that you could set right near the bottle? The heat from the bulb might be enough to keep things from freezing.


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 Post subject: Re: Freeze Hazard?
PostPosted: Mon Jan 15, 2018 6:36 am 
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Joined: Sun Jan 23, 2011 4:54 am
Posts: 1658
oh crap!! Never thought of the AFFF freezing. I assumed it would be lower freezing temp since there were a fair amount of AFFF additive to the water, but noooo.. Standard 6% AFFF seems to be spec'd at to freeze -1C (30F).

I could certainly see this being a problem for the many racers that live north of I-10.. We've had several hard feezes here in Houston in the last couple years, and I've never had an issue with the stuff in the bottle freezing. we have another cold snap coming this week and snow expected tomorrow, but I fortunately don't have to worry about it right now-- at the last race, I was trying to diconnect the bottle to do some work under the dash which required the cable to be removed.. well ya- I got in a hurry and accidentally pulled the freakin pin.. so the can is empty right now anyway.

With a quick bit of googling, there are many "low temp AFFF" options out there like this one:
http://www.chemguard.com/fire-suppressi ... -lt29.aspx
https://www.ansul.com/en/us/DocMedia/F-2003282.pdf

Would it be acceptable to replace the solution in the bottle to one of these lower temp options? However, I assume this may affect the SFI/FIA rating of the system??

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Houston Region
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 Post subject: Re: Freeze Hazard?
PostPosted: Thu Jan 18, 2018 4:38 am 
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Joined: Tue Nov 24, 2009 5:32 am
Posts: 439
Well if it gets cold enough in your shop to freeze and damage your AFFF fire system, then if you have plumbing in your shop it will get cold enough burst water pipes.

In South Carolina you can normally count the days where the temp gets under freezing on both hands and not run out of fingers, but this is not a normal year, like a lot of the South we are having morning lows in teens, and 20s almost everyday for well over a month now, for sure one of the coldest winters I can ever remember in the South. Bottom line my shop is climate controlled, and on these cold days and mornings I just make sure heat is on but turned back to around 45-50 degrees.

I am getting ready to build a new shop, it will be insulated to the hilt, even going for the best insulated garage doors, entrance doors, and even insulated windows, it will have gas heat and central A/C, although here the AC is more important most years, I am getting to old to work in a 100 degree shop in the summer. I gave up on not having AC about 5 years ago in the current shop, and it was amazing once I ACed the current shop how much more I got done in the dog days of summer, bottom line, it paid for itself.

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 Post subject: Re: Freeze Hazard?
PostPosted: Thu Jan 18, 2018 6:40 am 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1052
Location: Spring Hill, FL.
Yes they freeze. Drop light and some insulation over it.

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