Draw a single line, input the pipe diameter and radius, select the single line to automatically transform into a 3D pipeline

[jylai]

The attachment is just a simple example

T3.dwg

[BIGAL]

1st your example dwg is flat the pipe is not 3D.

 

Ok rather than code this is how I would do it.

Fillet the pline with correct radius as required.

Draw a circle that is dia on end point of pline

Ucs ob pick pline near circle

Use Rotate3d to rotate the circle to a vertical alignment look at Ucs Icon I used Y axis 90.

Use extrude path 

UCS W

All done`

 

You need to practice your 3d solid skills. I made this faster than I could write code.

Edited March 14 by BIGAL