What is the first step in securing the Portable Exothermic Cutting Unit (PECU) during an emergency?

The correct procedure for securing the Portable Exothermic Cutting Unit (PECU) during an emergency is to release the torch oxygen lever first. This action is crucial because it stops the flow of oxygen to the cutting torch, which is essential in preventing a potential backfire or unintended ignition of the fuel. By stopping the oxygen supply, you effectively reduce the risk of the flames spreading or intensifying.

While other actions, such as disconnecting the fuel line, turning off the gas supply, or extinguishing nearby flames, are important components of overall fire and emergency response, they should be executed after ensuring that the torch is no longer actively producing heat and flames. This prioritization helps to establish a safe environment more quickly and effectively during an emergency situation.