Do usual spray fire extinguishers contain liquid nitrogen? Why don't firefighters use liquid nitrogen instead? - truck fire extinguisher
Why does not the fire department use of liquid nitrogen instead of water in fire engines?
Sunday, January 17, 2010
Truck Fire Extinguisher Do Usual Spray Fire Extinguishers Contain Liquid Nitrogen? Why Don't Firefighters Use Liquid Nitrogen Instead?
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There are many different types of fire extinguishers, depending on the intended use. Fire extinguishers in the house are graded A, B or C fires, and usually contain sodium bicarbonate, powder or equivalent.
The use of fire geometric symbol of the class icon should
A trash triangular green wood and solid fuel fires regular
B Red Square gasoline can with a puddle of burning flammable liquids and gases
C Blue Circle with a combustion engine electrical cables under tension Related Equipment
D Yellow Pentagram Burning combustible metals gears and bearings
K black combustion of cooking oils Hexagon Pan
So the answer to your first question is no, aerosol fire extinguishers are NOT using liquid N2.
Liquid N2 is not used for a number of reasons:
N2 liquid must be kept refrigerated to very low temperature or-321f-196C.
N2 fluid can cause serious damage to human tissue causing freezing
If the liquid evaporates, formed N2, N2 gas, which is a suffocating, displaces oxygen in the local atmosphere - in fact, dilute the local oxygenConcentration below the level that is safe for human life (under 19 vol% O2).
No fire extinguisher liquid nitrogen is not used. However, only some of them make an injection of gaseous nitrogen under pressure.
The number one reason that we are in our trucks cost. Taxpayers are already complaining about maintenance costs of FD on the list. The last thing we need to do is annoy them more, for the cost of liquid nitrogen.
Liquid nitrogen will require significant changes in trucks and expensive enough to go. The higher the purchase price is sufficient to deny their use. The water is still the best resources available to fight fires.
In addition to the liquid nitrogen evaporates into the air and it becomes impossible to direct the flow of a fire.
Apart than this, they would need huge quantity of liquid nitrogen which is not much possible to acquire.
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