Enter the distance from the top of the floating head flange to the intersection of the dished head makes with the flange. This value is a positive dimension.
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The software can use the value you enter to automatically calculate the hr dimension (Distance from Flange Centroid to Head Centerline). After you enter a value for Distance from Flange Top to Flange/Head Intersection, press Enter and the software automatically calculates the distance from the flange centroid to the mid-point of the flange/head intersection (hr).
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Enter the dimension in the un-corroded condition. During the calculation, the software automatically considers the corrosion allowance to compute hr, as shown in the following illustration:
