DispSilh 0
PLANTINSULATIONDISPLAY <ON>: ON in Plant 3d
NavisWorks In the Standard properties Turn OFF insulation “Iso Information” “PNPInsualtion Display” Off or make it transparent.
https://knowledge.autodesk.com/support/autocad-plant-3d/troubleshooting/caas/sfdcarticles/sfdcarticles/Pipe-from-AutoCAD-Plant-3D-will-not-display-insulation-in-Navisworks-if-DISPSILH-is-on.html
https://knowledge.autodesk.com/support/autocad-plant-3d/learn-explore/caas/CloudHelp/cloudhelp/2018/ENU/Plant3D-UserGuide/files/GUID-A0C04E0C-C5E2-478F-ADBA-7998FCC19E72-htm.html
https://knowledge.autodesk.com/support/autocad-plant-3d/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/Plant3D-UserGuide/files/GUID-3A78A23F-FC41-4056-8908-B71FDC01413F-htm.html