What must fully enclose the cylinder cascade containers and dispensing system?

The correct answer emphasizes the need for fencing around the cylinder cascade containers and dispensing system. Fencing serves several crucial purposes in ensuring safety and security in settings where compressed natural gas (CNG) is utilized. It acts as a physical barrier that helps prevent unauthorized access to high-pressure gas equipment, thereby minimizing the risk of accidents or tampering. Additionally, fencing can protect both the equipment and individuals from potential hazards associated with CNG, such as leaks or explosions.

Fencing is typically designed to meet regulatory requirements and industry standards, ensuring that it provides adequate protection while allowing for safe and accessible operations. In contrast, walls would provide a more enclosed environment but might not be necessary or practical in all scenarios, and they could limit visibility, which is important for safety monitoring. Tents are not a suitable choice as they do not offer the necessary structural integrity or security against external hazards. Barriers can be part of a broader safety strategy but may not fulfill the same comprehensive role that fencing does in this context. Overall, the choice of fencing aligns best with regulatory compliance and operational safety in environments using compressed natural gas.