What type of component must be installed on a bundle from the shell to facilitate pulling it?

The correct choice for the component that must be installed on a bundle from the shell to facilitate pulling it is tube steel. In the context of heat exchangers, particularly shell and tube heat exchangers, tube steel provides the necessary structural support for the tube bundle. This structural support is crucial during the installation and maintenance process, especially when the bundle needs to be pulled out for cleaning or repairs.

Tube steel is specifically designed to interact with the tube bundle, ensuring stability and allowing for safe transport. It assists in keeping the tubes in place and distributing the load evenly, which is essential for preventing damage to the tubes and maintaining the integrity of the heat exchanger system.

On the other hand, while floating heads and channel heads are components that play roles in heat exchangers, their primary functions are related to allowing for differential thermal expansion and providing access for maintenance rather than facilitating the pulling of the bundle. A shell cover also serves the function of enclosing the heat exchange area but is not primarily designed for bundle pulling. Thus, tube steel is the essential component for this function.