Select the value from the list.
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Actual - Actual diameter and thickness. The software uses the actual diameter entered in the Nominal Diameter of Nozzle box and the actual thickness entered in the Actual Thickness of Nozzle (0 if Nominal) box.
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Nominal - Nominal diameter and thickness. The software looks up the actual diameter based on the nominal diameter entered in the Nominal Diameter of Nozzle box, and looks up the nominal thickness based on the schedule entered in the Nominal Schedule of Nozzle field.
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Minimum - Minimum diameter and thickness. The software looks up the actual diameter based on the nominal diameter entered in the Nominal Diameter of Nozzle box, and looks up the nominal thickness based on the schedule entered in the Nominal Schedule of Nozzle field. It will then multiply the nominal thickness by a factor of 0.875.