Defines the distance from the top of the tank shell to the location of the top wind girder.
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If the top wind girder is at the top of the shell, type 0.
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If the top wind girder is below the top of the tank, such as for a walk-way, type the actual distance.
If you specify a value of greater than 0.01, the software shows the wind girder on
the 3D model. The software displays intermediate wind girders, when applicable, after
analysis on the model and in the Wind, Material, Thickness & Weights report.