Which of the following is NOT part of isolating a confined space?

In the context of isolating a confined space, certain procedures are essential to ensure safety before any work begins. Lock-out/tag-out procedures are critical because they prevent the accidental re-energization of machinery or equipment while maintenance is being performed. Removing sections of ductwork can also be a part of isolation procedures, as it creates a physical barrier that helps prevent backflow of air pollutants or hazardous materials. Additionally, using a double block-and-bleed system is a common practice in isolating sections of piping to eliminate the risk of leaks or exposure to hazardous substances.

Inerting with combustible gas, on the other hand, does not align with isolation procedures. In fact, inerting typically involves the introduction of non-combustible gases to displace oxygen and prevent combustion in an enclosed space, which may be necessary for creating a safe atmosphere. However, it does not directly contribute to isolating the space from energy sources or hazardous materials. Instead, it focuses on managing the atmosphere within the space rather than isolating it from external threats or influences. Thus, this action does not fit into the isolation procedures necessary to secure a confined space before beginning work.