When should leak tests on stored pressure extinguishers be performed?

The correct timing for performing leak tests on stored pressure extinguishers is after a recharge. This is crucial because when an extinguisher is recharged, it undergoes a pressure change, and there is a possibility that seals or valves may not be fully intact. The leak test ensures that the extinguisher can maintain its proper pressure without any loss over time. This is vital for ensuring the extinguisher is in optimal working condition and ready for use in an emergency.

While other intervals, such as monthly or yearly checks, are important for overall maintenance, they do not specifically address the critical need to verify the integrity of the extinguisher's enclosure immediately following a recharge. Performing a leak test before installation is also essential; however, it focuses on ensuring that a new unit is functioning correctly rather than verifying the status of an already charged unit after modifications.