Brief Notes on Chemistry of Fire Extinguishers
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There are two main types of fire extinguishers: stored-pressure and cartridge-operated. In stored pressure units, the expellant is stored in the same chamber as the firefighting agent itself. Depending on the agent used, different propellants are used. With dry chemical extinguishers, nitrogen is typically used; water and foam extinguishers typically use air. Stored pressure fire extinguishers are the most common type. Cartridge-operated extinguishers contain the expellant gas in a separate cartridge that is punctured prior to discharge, exposing the propellant to the extinguishing agent. This type is not as common, used primarily in areas such as industrial facilities, where they receive higher-than-average use. They have the advantage of simple and prompt recharge, allowing an operator to discharge the extinguisher, recharge it, and return to the fire in a reasonable amount of time. Unlike stored pressure types, these extinguishers use compressed CO2 instead of nitrogen, although nitrogen cartridges are used on low temperature (-60 rated) models.
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Brief note on Fire Extinuishers
When used properly portable fire extinguishers can savd lives and properly by putting out a small fir or containing it until the free department arrives.
Portable fire extinguishers for home use , however are not designed to fight large or spreading fires .
Six types of fires extinguishers are found in the market :
Foam (aqueous film forming foam (AFFF)): solid and liquid fires
Carbon dioxide (CO2): solid, liquid, gas, oil, fat and electric fires
Dry chemical powder: solid, liquid, gas, oil, fat and electric fires
Wet chemical: solid, oil and fat fires
Vaporizing liquid: solid, liquid, gas and electric fires
Extinguishing agents are kept under pressure in the cylinders using compressed air, gas or chemicals that produce gas when initiated by suitable means. Once the safety lock is removed and the trigger or handle is squeezed, the contents come out through the extinguisher's nozzle at high pressure.
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#Hope its help
_________________________
Brief note on Fire Extinuishers
When used properly portable fire extinguishers can savd lives and properly by putting out a small fir or containing it until the free department arrives.
Portable fire extinguishers for home use , however are not designed to fight large or spreading fires .
Six types of fires extinguishers are found in the market :
Foam (aqueous film forming foam (AFFF)): solid and liquid fires
Carbon dioxide (CO2): solid, liquid, gas, oil, fat and electric fires
Dry chemical powder: solid, liquid, gas, oil, fat and electric fires
Wet chemical: solid, oil and fat fires
Vaporizing liquid: solid, liquid, gas and electric fires
Extinguishing agents are kept under pressure in the cylinders using compressed air, gas or chemicals that produce gas when initiated by suitable means. Once the safety lock is removed and the trigger or handle is squeezed, the contents come out through the extinguisher's nozzle at high pressure.
_________________
#Hope its help
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