How often must dry chemical extinguishers requiring a hydrostatic test be emptied for maintenance procedures?

Dry chemical extinguishers requiring a hydrostatic test must be emptied every 6 years for maintenance procedures. This interval is established to ensure that the extinguishers are in good working condition and that the contents remain effective. The hydrostatic test serves to verify the integrity of the cylinder. By emptying the extinguisher, maintenance personnel can inspect the interior for any corrosion, sediment, or other issues that may compromise its functionality. Regular maintenance at this interval helps ensure the extinguisher will perform effectively during a fire emergency.