When should a hydrostatic test be performed on a fire extinguisher?

The correct timing for a hydrostatic test on a fire extinguisher is at the time of maintenance or recharging. This test is critical for ensuring the integrity and safety of the extinguisher's cylinder. During a hydrostatic test, the extinguisher is filled with water and subjected to high pressure to check for leaks, weak points, and overall structural integrity.

Performing the hydrostatic test at the time of maintenance or recharging allows for comprehensive assessment and ensures that any issues can be identified and addressed immediately, thereby enhancing the reliability of the fire extinguisher when needed. Although periodic inspections and maintenance are essential, the hydrostatic test is a specific requirement that does not happen annually or on a set schedule like every three or five years. Instead, it aligns with when maintenance or recharging occurs, as that is when the extinguisher is accessible and can be safely tested.