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[MW:20832] UG-80 & UG-81 Clearance

Dear Expert 
please clarify
 
1.          When the cross section passes through an opening
             or within 1 I.D. of the opening measured from the center
             of the opening, the permissible difference in inside
             diameters given above may be increased by 2% of the inside
             diameter of the opening. When the cross section
             passes through any other location normal to the axis of
             the vessel, including head‐to‐shell junctions, the difference
             in diameters shall not exceed 1%.

2.          The inner surface of a torispherical, toriconical,
              hemispherical, or ellipsoidal head shall not deviate outside
              of the specified shape by more than 11/4% of D nor inside
              the specified shape by more than 5/8%of D, where D is the
              nominal inside diameter of the vessel shell at point of attachment.
              Such deviations shall be measured perpendicular
             to the specified shape and shall not be abrupt. The
             knuckle radius shall not be less than that specified.

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