Pipe or Tube Ovality Calculator

Reference: Acceptable ovality of a pipe should be determined by user, but as a guideline, 5% is a typical acceptance criteria, and ASME defaults to 8%.

ASME B31.1-2001
104.2 Curved Segments of Pipe (B) For ferrous material, when the radius of a bend is 5 nominal pipe diameters or greater, and the nominal wall thickness of the pipe is schedule 40 or thicker, the difference between maximum and minimum diameters shall not exceed 8% of average measured outside diameter of the pipe before bending.