Probability approach which addresses the uncertainty and likely values of pipe performance properties by using distributions of geometric and material property values. NOTE These distributions are combined with a limit state equation to determine the statistical distribution of a performance property. The performance distribution in combination with a defined lower percentile determines the final design equation.
Source: API TR 5C3, Technical Report on Equations and Calculations for Casing, Tubing, and Line Pipe Used as Casing or Tubing; and Performance Properties Tables for Casing and Tubing, Upstream Segment, First Edition, December 2008. Global Standards