C02 fire extinguishers don’t have a pressure gauge because they use liquefied C02 (commonly known as dry ice) which as a chemical characteristic, always …
Buckeye Model C-100-SE 100 lb. Carbon Dioxide Wheeled Fire Extinguisher Model Number 35100; Buckeye Model C-50-SE 50 lb. Carbon Dioxide Wheeled Fire Extinguisher Model Number 35050; Buckeye Model OS W-150 …
Why is there no pressure gauge on a CO2 fire extinguisher?
Because the CO2 gas is pressurized at up to 70 bar nitrogen pressure . and As per IS2190 2012 it says pressurized mean fire fighters can not understand to its pressurized or not so the net weight and tare weight been embossed on every Co2 fire extinguisher so if we find 10% less then net weight we need to refill the Co2 fire extinguisher.
CO2 extinguishers don’t have gauges as they self pressurise (by the boil off of liquid CO2 into CO2 gas in the ullage space) as oppose to being separately pressurised by a Nitrogen over gas and as a result remain at constant pressure until all the liquid CO2 has gone, so a gauge wouldn’t tell you anything!
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Why does a CO2 extinguisher have no pressure gauge?
CO2 extinguishers have no gauge because they are filled with liquefied CO2. C02 is a gas at room temp until it is compressed to around 830 psi. at which point, it begins to liquefy under that pressure. At that point the pressure will remain constant until the container is filled to its rated capacity (by weight), with liquid C02.
Why don’t fire extinguishers have a level gauge?
The best way to verify the extinguisher is charged is by weight, so the gauge is virtually useless. I assume they don’t have liquid level gauges because they are inaccurate, an added expense, relatively complicated, and unnecessary for yearly checks. But that’s just conjecture.
What happens to CO2 in a fire extinguisher?
Although CO2 is stored in its solid form, once the pressure is released from the fire extinguisher and the CO2 is released into room temperature (or anything warmer than -110 degrees Fahrenheit) it immediately changes into a gas. This neat characteristic of CO2 is called sublimation- meaning that it turns immediately from a solid to a gas.
Can carbon dioxide pressure be measured with a pressure gauge?
My guess would be that the carbon dioxide is a liquid in equilibrium with its vapor, so that the gauge would not give any indication of the quantity. As one adds or removes the gas, the pressure is always the vapor pressure, until there is no liquid left. A simple go/no-go indicator would be as meaningful as a gauge, and far less expensive.
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Why portable co2 extinguisher has no gauge??? Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher