Which of the following actions is prohibited in flat-bar top rails?

In the context of flat-bar top rails, the prohibition of certain actions is critical for maintaining the integrity and safety of the container. The correct answer—regarding the prohibition of inserting—aligns with the need to avoid compromising the structural strength of the top rails. Inserting typically refers to adding material or components that were not originally designed for the flat-bar top rails, which can lead to weaknesses or failures in load-bearing areas.

The integrity of the flat-bar design is critical in the container’s structure, and any modifications that involve inserting foreign objects or materials can create unexpected stress points. This can have severe implications for safety during transport and handling, as well as leading to regulatory compliance issues.

While other actions like sectioning, patching, and welding might be used in certain contexts to repair or modify different parts of a container, these actions are typically more controlled and designed to maintain or restore structural integrity when performed according to established safety protocols. In contrast, inserting involves unauthorized modifications that can directly undermine the intended design and functionality of the flat-bar top rail structure.