Mill tolerance and Piping Stress Analysis

“Where does mill tolerance come from?” Does the mill tolerance affects weight, Fy and sustained stress for B31.3?”, “What should be taken as a tolerance on plate? “, “What is the significance of ”.

Mill tolerance comes from the manufacturing process of seamless pipe. Welded pipes have a tolerance as well, but usually is not a mill tolerance and it is much lower because it’s more easy to get high accurancy when producing steel plates. On the other hand welded pipes need to consider the weld joint efficiency factor, to take in account the weakness in the welding.

Corrosion allowance is calculated from the corrosion rate per year (depending on pipe material, temperature, atmosphere, type of fluid, concentration,…)

https://www.scribd.com/document/219588607/Mill-Tolerance
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