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In a technical paper, “Estimation of Residual Stress Levels in Fitness For Service Evaluations of Linepipe,” ROSEN Group Engineers Bob Andrews and Simon Slater provide the basis for recommended residual stress levels to use in the assessment of axial cracks in steel transmission pipelines.

Presented at the 2018 ASME Pressure Vessels and Piping Conference in Prague, this effort earned Andrews and Slater the award for “Outstanding Technical Paper” from the ASME PVP Design & Analysis Technical Committee.

In the paper, Andrews and Slater consider the recommended residual stress levels in standard codified Fitness For Service methods and adjust the recommendations to account for details of the manufacturing approaches used for linepipe. The approaches include major current manufacturing routes such as high frequency induction welding, and also processes which are no longer used, for example flash butt welding. Recommended residual stress levels and open literature results are then summarized for each method. For most processes the recommended residual stress levels are low, which has beneficial effects on the tolerable crack sizes calculated in Fitness for Service assessments.

Interested in reading the full paper? Visit the ASME digital Collection for more information.