Equipment connected to a piping system must have an accessible approved manual shutoff valve with what feature?

The requirement for an approved manual shutoff valve in a piping system to have a non-displaceable valve member is fundamental for safety and operational integrity. A non-displaceable valve member ensures that the valve remains securely seated in its closed position, reducing the risk of accidental leakage of propane. This feature prevents the valve from being unintentionally opened or displaced, thereby providing a reliable means of controlling the flow of propane.

Such a design is particularly important in gas systems, as it enhances safety by minimizing potential hazards associated with valve failure or improper operation. By ensuring that the valve cannot be inadvertently dislodged or left open, personnel can be confident in the system's ability to safely contain the propane until a deliberate decision is made to open the valve.

Options such as remote operation capability or automatic closure may offer convenience and functionality but do not inherently address the critical safety aspect of ensuring that the shutoff mechanism is secure. Similarly, while interlock mechanisms can enhance safety by preventing simultaneous operations, they do not directly contribute to the basic requirement of maintaining a reliable seal in the event of an emergency. Therefore, the inclusion of a non-displaceable valve member is a key feature for enhancing both safety and operational reliability in propane piping systems.