Which of the following choices is NOT one of the means of closing the emergency shutoff valve?

The choice that is not a means of closing the emergency shutoff valve is manual shutoff from a satellite orbiting the earth. This option is impractical and unfeasible for emergency situations. Emergency shutoff valves are typically designed to be activated through more immediate and accessible means, such as manual shutoff at the valve itself, remote electronic control, or automatic activation in response to pressure loss.

Manual shutoff at the valve allows for quick action on-site, ensuring immediate response in the event of an emergency. Remote electronic control provides an option for operators to close the valve from a distance, which can be critical in scenarios where the operator must maintain safety. Automatic activation upon pressure loss is essential for ensuring that the system reacts autonomously to dangerous conditions, thus preventing potential hazards. The reliance on satellite technology for such urgent operations does not align with the practical needs of propane system safety protocols.