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If during some point of your project, you change your Element Templates or Named Expressions, already modeled pipelines are not automatically redrawn to represent new look. You need to manually 'trick' OPM into redrawing your old components and unfortunately, there is no tool or key-in to do just that. There are multiple commands in OPM which does redraw components after them, but I would recommend to use "Edit Insulation" in Pipeline Manager, as it requires very little user input and does redraw all components as needed.
Note: this is only applicable to users working in a file based mode, users working with a OpenPlant ModelServer setup should not get into these kind of issues, as updated Element Template should be used on the next component check-out.
If your line has no insulation, just add some to it (there is no difference in the settings), click OK.
After component update finishes, Edit the insulation again and check on the Remove Insulation to get your pipeline to the original state.
After these updates, your pipeline should have a new Element Template applied to it, according to the changed Named Expressions. If you pipeline already has some insulation, you would need to switch the order of steps 2-3, by firstly removing insulation, and then adding it back again.