Enter the distance from the flange centroid to the intersection of the head centerline and the flange. This distance is known as the hr dimension and should be entered in the corroded condition. The hr dimension is positive if it is above the flange centroid and is negative if it is below the flange centroid.
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If the Distance from Flange Top to Flange/Head Intersection is known, you can enter it in the un-corroded condition and press Enter. The software calculates the hr dimension in corroded condition and places its value in the input.
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The hr dimension is used in the Code calculation but not in the Soehren's calculation as shown in the following illustration:
