Out-of-roundness of the pipe, calculated as follows: (Dmax – Dmin) / (Dmax + Dmin), where Dmax and Dmin are maximum and minimum pipe outside diameter, respectively.

Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards



Deviation of the circumference from a circle which has the form of an elliptic cross section.

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards

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