What is the maximum allowable discharge duration for dry chemical systems?

The maximum allowable discharge duration for dry chemical systems is in the range of 10 to 30 seconds. This duration is established to ensure that the extinguishing agent is discharged quickly enough to effectively control and suppress a fire, especially in environments where rapid response is crucial.

Discharge times longer than 30 seconds may not provide the necessary concentration of the extinguishing agent in the specific area where it is needed. This can lead to inefficiencies in combating the fire due to potential re-ignition or insufficient coverage. Additionally, a prolonged discharge time could result in a waste of the extinguishing agent, which can be costly and environmentally harmful.

The specified duration allows adequate time for the system to focus the dry chemical on the fire while minimizing risks associated with prolonged exposure to the hazardous environment. Therefore, the range of 10 to 30 seconds is optimal for effectiveness and safety in fire scenarios involving dry chemical extinguishing systems.