Re: Fire extinguishers

On 15 May 2007 07:11:32 -0700, "dcaster@xxxxxxx" <dcaster@xxxxxxx>
wrote:

On May 14, 6:49 pm, Jon Elson <e...@xxxxxxxxxxxxxxxx> wrote:


I got a bunch of retired water/air units on eBay.
These have 5 gallons of water pressurized with
compressed air. You wouldn't want
to use it on live electrical equipment
Depending on the hazards at your place, you may need several
types, for combustible metals, fuels, electrical, etc.

Jon

You might not want to use a portable water fire extinguisher on live
electrical equipment. But you might want to use a hose. NASA did a
study on computer fires. Burning printed circuit boards are hard to
extinguish.
NASA's conclusion was to use water. The water stream breaks up and
does not conduct electricity well and besides the water in the hose is
grounded. Maybe the water on the burning boards conducts, but that
causes the circuit breakers to blow. The water provides cooling which
is what is needed. The Navy came to pretty much the same conclusion
and uses low velocity fog nozzles.

Dan

A lot of computer centers have gone to water flood and fog. A couple
seconds before the water is released, main power contactors kill the
power. CO2 flood tended to make chips and components pop like popcorn
due to thermal shock.

All because of the Halon ban.

Gunner

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