What is one sign that a dry chemical system may require replacement?

A dry chemical system that has experienced multiple discharges without maintenance is a clear indicator that it may require replacement. Each time a dry chemical system discharges, the integrity of the components can be compromised. These discharges deplete the extinguishing agent, and if the system isn't properly recharged or inspected afterward, its effectiveness can significantly diminish. Regular maintenance is essential to ensure reliability and safety; therefore, a system that has undergone multiple activations may not function as intended in future emergencies if it has not been properly serviced.

In contrast, a system exhibiting normal functioning indicators or consistently meeting inspection standards suggests that it is in sound working order and does not require immediate replacement. A system that has never been activated does not inherently imply a need for replacement, as long as it has been maintained and meets inspection standards. Hence, the best choice that clearly shows the necessity for replacement is a system that has discharged multiple times without proper maintenance.