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If a stress analysis is required after calculating the wall thickness, is it necessary that the sum of primary stress and secondary stress be less than the allowable stress in order to use this calculated wall thickness? Where are the experts?
There are specific formulas or rules for calculating and selecting wall thickness. If the stress value does not meet the requirements, it generally has no effect on the wall thickness. Of course, if the wall thickness is too thin, it loses its meaning for mechanical analysis.
The calculation of pipe wall thickness is based on ASME B31.3 or B31.1. Stress analysis takes into account the flexibility of the pipeline; the pipe wall thickness is determined first, and stress analysis is carried out thereafter, without re-calculating the wall thickness just because the stresses are within acceptable limits.
The wall thickness is determined through conventional design calculations, and most of the stress issues arising from stress analysis can be resolved by changing the direction or installing supports; generally, the wall thickness is not altered.