Which statement is true about CO2 extinguishers?

Which statement is true about CO2 extinguishers?

• A. They must be weighed to determine charge; recharge if weight less than 10% of stamped weight
• B. They have a pressure gauge always
• C. They require replacement every year
• D. They do not require maintenance

Answer: (A)

CO2 extinguishers are stored-pressure cylinders, and the amount of extinguishing agent is most reliably checked by weight rather than by a pressure gauge. Each cylinder has a stamped full weight, and you compare the current weight to that value. If the weight is reduced by 10% or more, the extinguisher should be recharged. This method accounts for how a CO2 cylinder loses effective content and pressure over time and with temperature changes. CO2 extinguishers do require periodic maintenance and inspection, and they are not replaced every year. Many CO2 models do not have a pressure gauge, so relying on weight is the practical way to assess charge.

CO2 extinguishers are stored-pressure cylinders, and the amount of extinguishing agent is most reliably checked by weight rather than by a pressure gauge. Each cylinder has a stamped full weight, and you compare the current weight to that value. If the weight is reduced by 10% or more, the extinguisher should be recharged. This method accounts for how a CO2 cylinder loses effective content and pressure over time and with temperature changes. CO2 extinguishers do require periodic maintenance and inspection, and they are not replaced every year. Many CO2 models do not have a pressure gauge, so relying on weight is the practical way to assess charge.