In this section the entire model, except the T junction, will be created. The model to be created is composed of two pipes forming a 60-degree angle. To start with, the first pipe will be created. This pipe will then be rotated to create the second pipe.

Creating the profile

1. Select the ok layer and click on Layer To use. From now on, all entities created will belong to the ok layer.
2. Choose the option Line, located in Geometry Create Line.
3. Enter the following points: (0, 11), (8, 11), (8, 31), (11, 31), (11, 11) and (15, 11). Press ESC to indicate that the process of creating lines is finished.



Figure 8. Profile of one of the disks around the pipe

4. From the Copy window, choose Lines and Translation. A translation defined by points (0, 11) and (15, 11) will be made. In the Multiple copies option, enter 8 (the number of copies to be added to the original). Select the lines that have just been drawn.



Figure 9. The profile of the disks using Multiple copies

5. Choose Line, located in Geometry Create Line. Select the last point on the profile using the option Join C-a, which is in Contextual on the mouse menu. Now choose the option No join C-a. Enter point (200, 11). Press ESC to finish the process of creating lines.
6. Again, choose the Line option and enter points (0, 9) and (200, 9). Press ESC to conclude the process of creating lines. (Figure 10)

Figure 10. Creating the lines of the profile

Figure 11. Copy of the vertical line segment starting at the origin of coordinates

7. From the Copy window, choose Lines and Translation. As the first and second point of the translation, enter the points indicated in Figure 11. Click Select and select the vertical line segment starting at the origin of coordinates. Press ESC.
8. Choose Geometry Create Intersection Multiple lines. Select the two last lines created and the vertial line segment coming down from the tangential center. (See Figure 12.) Press ESC.



Figure 12. Selecting the lines to intersect

9. Choose Geometry Delete All Types. (This tool may also be found in the GiD Toolbox.) Select (to delete) the lines and points beyond the vertical that passes through the tangential center. Press ESC. The result should look like that shown in Figure 13.