For inert gas agents, multiple storage container sizes connected to a common manifold are permitted. Which option describes this allowance?

• A. Not permitted
• B. Permitted to utilize multiple storage container sizes connected to a common manifold
• C. Only identical sizes
• D. Only containers of the same volume

Answer: (B)

Inert gas systems can be designed with different-sized storage cylinders feeding a single common manifold. This arrangement is allowed because it provides flexibility in achieving the required total agent quantity without forcing every cylinder to be the same size. The individual cylinders each have their own valves, but they join into one discharge path, where regulators or flow control devices ensure the overall discharge remains within the system’s design parameters and the target concentration is achieved safely. This modular approach simplifies procurement, inventory, and maintenance, and it accommodates expanding or replacing cylinders without redesigning the network. The critical point is that the common manifold can accept multiple cylinder sizes while still delivering the correct total mass flow and concentration when released as designed.