What is the first step in the oxy-fuel shut down procedure?

The first step in the oxy-fuel shutdown procedure is shutting off both cylinders because it helps ensure the safety of the work environment by preventing any gas from remaining in the system. When the cylinders are closed, it effectively stops the flow of oxygen and fuel, reducing the risk of leaks and potential hazards associated with pressurized gases. This step is crucial as it establishes a controlled environment and mitigates the risk of fire or explosion, which can occur if gases remain in the lines or equipment.

Subsequent steps involve turning off the torch and closing the oxygen valve, but these actions follow the initial step of closing the cylinders. Disconnecting fuel lines is also important, but it is best done after ensuring that there is no gas pressure in the system to maintain safety.