What is required before welding or cutting with a torch in a gas-containing area?

Before welding or cutting with a torch in a gas-containing area, it is critical to ensure that all sources of gas are secured. This means isolating or shutting off gas supplies to prevent the possibility of combustion or explosions due to sparks generated during the welding or cutting processes. Gas lines can be pressurized, and any breach or ignition source can result in hazardous situations. Therefore, securing all gas sources is a primary safety measure to maintain a safe working environment when carrying out such operations.

While it is also important to have emergency services on standby, ensure only certified personnel are conducting the task, and keep flammable materials away, the immediate and essential step is to ensure all gas sources are under control, significantly mitigating the risk of fire or explosion.