Which component should be turned off first to safely extinguish a torch flame?

When extinguishing a torch flame, it is important to prioritize safety and follow the correct procedure for turning off the gas components. The proper method involves turning off the oxygen supply first. This is because oxygen is the key element that supports combustion; without oxygen, flames cannot sustain themselves.

By turning off the oxygen supply first, you diminish the flame's ability to continue burning. This action also minimizes the risk of flashback, which is a potential hazard when dealing with flammable gases. When the oxygen is cut off, the fuel gas (like acetylene, propane, or butane) will cease to burn effectively, allowing for a safer extinguishing process overall.

Turning off the fuel gas sources afterward, such as acetylene, propane, or butane, effectively ensures that any remaining flammable gas is then eliminated once the flame is safely out, leading to a more controlled and secure shutdown of the torch system. Thus, turning off the oxygen first is a critical and necessary step to safely extinguish a torch flame.