What tag should be attached to valves operated by firemen?

The correct answer, "Gas Off," is significant because it clearly indicates that the valve is in the off position, which is critical for safety in an emergency response situation. Firefighters must quickly ascertain the status of valves to ensure that gas supplies do not pose an additional hazard during firefighting efforts or rescues.

Using "Gas Off" as a tag helps to communicate to all responders at the scene that the valve has been intentionally shut down, preventing potential leaks or ignition sources that could complicate an already dangerous situation. This tag is consistent and universally understood within the firefighting community, enhancing swift decision-making and ensuring the safety of both the responders and the individuals in the affected area.

The other tags may imply different statuses or operations, but they do not provide the same level of clarity regarding the valve's function during emergency response. For example, "Gas Operational" could suggest that the valve is active, which might mislead personnel into assuming it is safe to use. Similarly, "Gas Closed" might not convey the active effort taken to secure the valve for safety, while "Gas Maintenance" potentially implies ongoing work and the need for caution, rather than signaling a safe, inactive state.