How can you tell if a fire extinguisher has been discharged or is defective?

A fire extinguisher can be assessed for discharge or defectiveness primarily by observing the pressure gauge and any physical damage. When the pressure gauge is located in the red zone, it indicates that the pressure is either too low, suggesting that the extinguisher may have been partially or fully discharged, or that it is defective. Visible damage, such as dents or cracks, also communicates that the extinguisher may not function properly in an emergency situation.

In contrast, a gauge located in the green zone represents that the extinguisher is in proper working condition and has sufficient pressure. A full color label does not provide information about the operational status of the extinguisher, and the removal of the safety pin alone does not signify whether the extinguisher is defective or has been discharged, as a safety pin is often removed in preparation for actual use rather than indicating its condition. Hence, monitoring both the pressure gauge and physical integrity is essential for ensuring that a fire extinguisher is ready for use.