What is the maximum allowed inward deformation for top side rail?

The maximum allowed inward deformation for the top side rail being measured at 30mm is based on industry standards that dictate tolerances for structural integrity and safety in dry van containers. This specific measurement ensures that the walls of the container remain functional and do not compromise the overall capacity to secure and protect cargo.

Inward deformation can occur due to various external forces, such as stacking, transportation stresses, or mishandling. Setting a permissible limit helps maintain the structural form of the container, ensuring it can withstand common stresses without leading to significant operational or safety issues. Allowing a deformation of 30mm recognizes some flexibility in material while still prioritizing the container's durability and safety during its lifecycle. This balance is crucial for maintaining the container's effectiveness in protecting its contents.

The other options present smaller tolerable limits, which, while they might appear to provide a stricter guideline, do not align with the established standards for maximum deformation in conventional dry van containers. This ensures containers can accommodate some level of wear and tear while still being robust enough for regular use.