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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