What is the measurement requirement for door sill web inward deformation?

The measurement requirement for door sill web inward deformation is crucial for maintaining the structural integrity and functionality of a dry van. Measuring from the undamaged area ensures that the deformation assessment reflects the actual condition of the door sill. This approach focuses on a stable reference point and helps in accurately determining the extent of any damage or deformation that has occurred.

Using undamaged areas for comparison helps in assessing the impact of any forces that may have caused the deformation, thus providing a clearer picture of the door structure's condition. This is important for warranty assessments, repairs, and ensuring that the dry van meets safety regulations.

Focusing on the other options, measuring from the center may disregard significant areas of deformation that could impact the function of the door and the overall safety of the van. Similarly, exceeding or being less than 50mm doesn't provide a comprehensive view of the condition if it's measured inaccurately or not from a proper point. Therefore, relying on undamaged areas is the most effective method to assess inward deformation accurately.