Re: Fire extinguishers

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

The Navy pretty much uses water on everything... They have pretty much
an endless supply of the stuff around the ship and any damage that it
might do to whatever it is being sprayed upon is secondary to the
damage that could occur if the fire got out of hand... Even for Class
D fires, we were taught to use salt water... OK, technically, it was
to use the force of the water stream to knock the burning metal
overboard.. <grin> If the burning item wasn't on deck, you were to
try to catch the burning item in a bucket of sand as it melted through
the decks... And *then* throw it overboard... Otherwise, it melts its
way through the ship and still ends up in the water, albeit with hole
for the damage control party to repair... Fuel oil fires work pretty
good with the low velocity fog nozzles...
.

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