Based on projects requirement to use HVAC pressed elbow radius 1.5D to 1D, below are modification required in AutoPLANT. 

Steps to Accomplish:

1. Go to Start>All program>Bentley>Plant V8i>Tools>Class editor.
2. Select the project , say ‘Metric’ project here
3. Search HVAC Pressed elbow. Refer below image.

            

      4.Click on HVAC Pressed Elbow.

      5.Click on draw method, refer below image.

           

      6.PElbow.ebs file will open for editing.

      7.Search “calculate torus radius” and change to radius=1.0*pipe OD,

         refer below image.

          

      8. Save the file File>save.

      9. Now open “Ports.ebs”file for editing, refer below image.

          

     10.Search “calculate the radius up to the centerline of the duct”.

     11. Change to “rad=1.0* length1” refer below image

          

      12. Save the file.

      13. Now open model and verify result for bend pressed elbow, elbow will be placed with radius 1D.