What should be checked annually in stored pressure, dry chemical extinguishers with stainless steel shells?

In the context of stored pressure, dry chemical extinguishers with stainless steel shells, inspecting the internal components annually is crucial for ensuring the extinguisher’s operational readiness. This annual check involves examining the interior of the extinguisher for any signs of corrosion, damage, or blockages that might prevent the effective discharge of the extinguishing agent.

Over time, the dry chemical powder can become compacted or allow moisture to enter, which can affect its performance. A thorough inspection of the internal components can help identify issues such as obstructions or deterioration that may compromise the extinguisher's functionality in an emergency.

While checking the exterior finish, agent compatibility, and pressure levels is important as part of regular maintenance, these aspects do not directly assess the critical operational capabilities of the extinguisher in the same way that inspecting the internal components does. Thus, focusing on the internal parts ensures that the extinguisher will perform effectively when needed.