Or otherwise: A "Pipeline" has "Design Size" in the "Design Conditions" (no "Size" -Value in the "Operating Conditons") A "Pipe Run" carrys the "Size" value for this branch of the Pipeline. So you note the "Design Size" in the "Design Conditions" upon creation of the "Pipeline". This immediately becomes the "Size" in the "Operating Conditions" of Run P1 that you are going to place subsequently. If you have several runs now you can change the "Operating" Size togehter or one by one - while the "Design Size" yet stays the same - given by the process calculations - or only is changed when the process is newly calculated.
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