Which of the following actions should be performed after closing the fuel gas valve during shutdown?

After closing the fuel gas valve during shutdown, backing out the regulator screws until they are loose is the correct action to take. This procedure is essential for ensuring that the regulator is not under pressure, which can help prevent any potential leaks or hazards. Loose regulator screws allow for proper depressurization of the system, enhancing safety for the next use of the oxyfuel cutting equipment.

Ensuring that the regulator is not engaged when equipment is not in use reduces wear and tear, prolongs its life, and prepares the system for proper maintenance. Once the system is depressurized, it becomes safer to move on to other shutdown procedures, such as returning the equipment to storage or disconnecting hoses.

In contrast, the other options do not adequately address safety protocols. Opening both hoses could create a risk of fuel gas escaping into the environment, which is not advisable. Returning the torch to storage without adjusting the regulator could pose a safety risk, as any remaining gas could lead to dangerous situations. Similarly, disconnecting the power supply is not relevant directly after handling the fuel gas valve; it's vital to manage the fuel gas system specifically before dealing with electrical components.