Hi Mike, I did the same exercise as you did using the WALKTHRU.DAT file. Changed the pressure/temperature, ticked Appendix P and material to API5L-X60. And the allowables are not the same. See attached. I also tried my model with A53-a and the allowables came to the same value between the two years as you said previously. I then tried all the API5L materials in the material list and every time, the allowables were different between the two year. I noticed that the expansion allowable is always 345MPa for the entire API5L series and that some give different operating allowables as well. Could it be a material library problem?
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