Defines whether the shell thickness calculation is for the entire shell course according to API-653 Section 4.3.3.1. This selection uses equation 4.3.3.1.a, which deducts one foot from the fluid height.
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This deduction only occurs if the one-foot method is in use.
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The software only displays this box when you select 653 in the API Design Code box at the top of the Tank Data tab.