Hi Ken, Thank you for the model. I have found that some of Directional Piping System Variables are missing. I was able to repair model using below procedure: Open a new clean model in the project and load piping. Then XREF the original model as Overlay. Once that is in, BIND INSERT attached XREF. Then use the EXPLODE command on the model. Save the model and confirm that all components are valid. To get full list of Piping System Variables type in AutoCAD command line (at_pipingsystem_displayvariables). Compare variables with ones from new model. Attaching repaired model for testing purpose. Regards, Artiom
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