Question:

After performing strength calculation on a model, the following error message in AutoPIPE Vessel appears:

  675    GEOMETRY (xxx): thickness = xx mm (>= xxx mm) ==> PWHT is required.

Why and how to avoid it?

Answer: 

Please open AutoPIPE Vessel help screen and search for PWHT:

Select the topic = Requested, and read the information provided. 

As mentioned, even if the Requested options is not checked yes, the calculation is carried out and error message printed.