What must be installed in manual shut off criteria for fuels delivered through a central distribution system?

In the context of flame effects as outlined in the NFPA 160 Standard, the requirement for a manual shutoff valve at the point of delivery is critical for ensuring safety during any performance or demonstration utilizing flame effects. A manual shutoff valve provides immediate control over the fuel supply, allowing operators to quickly stop the flow of fuel in case of an emergency or an unexpected situation. This is essential because it allows for a rapid response when human intervention is needed, thereby reducing the risk of accidents or uncontrolled flame effects.

The presence of a manual shutoff valve directly at the delivery point ensures that operators have a reliable means to halt fuel supply without relying on electronic systems, which may fail or have delayed responses. This aligns with the fundamental safety principles of NFPA 160, emphasizing the importance of having direct, manual control over potentially hazardous materials in performances.

While other systems, such as remotely operated control panels or monitoring systems, can enhance safety and operational efficiency, they cannot replace the necessity of having an immediate manual shutoff mechanism to address urgent safety concerns effectively. The manual shutoff valve serves as a primary line of defense and is a critical component in the safe management of fuel within flame effect operations.