Interpretation of the NB/T47003.1-2009 standard \"Steel Welded Atmospheric Pressure Vessels\"

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NB/T47003.1-2009 \"Steel Welded Atmospheric Pressure Vessels\" – Standard Interpretation, Page P150. In the calculation of the C-type example round steel tie rod, where does the value of 2000 for the tie rod length come from? Since tie rods are installed between the reinforcement columns adjacent to the container walls, shouldn’t the minimum length of these tie rods be at least equal to the width of the container plus the thickness of the four nuts attached to them? Similarly, in the Type E example, why is the length of the tie rod exactly equal to the length of the container? I think it is best to apply tension rods only in the width direction: the length of the tension rod should be equal to or greater than the width of the container plus the thickness of the four nuts attached to the rod. There are many instances in this standard where the standards and their definitions conflict with each other, making it difficult to understand. I will continue to follow up on this issue, and I hope that the experts at HaiChuan can provide some guidance.