Rules Of Isometric Drawing. In order to get a more complete view of the object, an orthographic projection may be used. Dimension is given relative to the centreline of piping.
The lines that are vertical and parallel are in their true length. Isometrics are not drawn to scale but should be proportional to easy understanding. Dimension is given relative to the centreline of piping.
Vertical edges are drawn as vertical lines. The angle between all the three axes must be 120 degrees. Horizontal edges are drawn at 30 degrees.
Projectorlines represent receding edges of an object. As a rule, they show an object from three different views (usually the front, top, & right side). An isometric drawing covers a complete line as per the line list and pefs.
Vertical edges are drawn as vertical lines. Isometric drawings also inform which piping should be constructed at the fabrication shop and which should be assembled at the construction/platform field itself. Such as structures, existing equipment…etc coordinates should also be shown on the isometric drawing
However, if the object in figure 2 had a hole on the back side, it would not be visible using a single isometric drawing. The angle between all the three axes of the coordinate plane must be equal to 120 degrees. Horizontal edges are drawn at 30 degrees.
What are the rules in isometric drawing? One vertical axis and two horizontal axes that are drawn at 30 degree angles from their true position. The rules of isometric projection:
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