For Information Only...
In some Engineering Companies, the material selection for the Piping Classes is done by the Piping Department, Not by the Design Section, not by the Stress Analysis Section either, but by the Material Engineering Section (who work together with the Material Control Section guys).
Material Engineers (in Piping Departments) are the ones that select the specific materials and ASME Classes (earlier named: "rating") and/or wall thicknesses and reflect its selection in the Material Selection Diagrams or Metalurgy Diagrams (Process Flow Diagrams that doesn't show the fluid properties but the Metalurgic selection for pipes and pieces of equipment).
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