When storage containers are connected to a manifold, what is required to prevent agent loss during maintenance?

• A. Automatic means, such as a check valve, shall be provided to prevent agent loss and to ensure personnel safety if the system is operated when any containers are removed for maintenance.
• B. Manual valves only must be used.
• C. No valve is required.
• D. A separate storage building is necessary.

Answer: (A)

Automatic isolation is required when containers are connected to a manifold to prevent agent loss and protect personnel during maintenance. An automatic means, such as a check valve, automatically blocks flow if any container is removed, so the system cannot discharge or leak through the open port even if maintenance is being performed. This keeps the agent contained and reduces the risk of exposure or unintended release.

Relying on manual valves alone isn’t as reliable, since human action may be delayed or omitted during maintenance, potentially allowing a leak or discharge. A separate storage building isn’t addressing the containment and safety concern during maintenance, and having no valve at all would leave the system unprotected.