Iso metric drawings interppretation:
Unlike orthographic, piping isometrics allow the pipe to be drawn in a manner by which the length, width and depth are shown in a single view. Isometrics are usually drawn from information found on a plan and elevation views. The symbols that represent fittings, Valves and flanges are modified to adapt to the isometric grid. Usually, piping isometrics are drawn on preprinted paper, with lines of equilateral triangles form of 60°.
The Iso, as isometric are commonly referred, is oriented on the grid relative to the north arrow found on plan drawings. Because ISO’S ARE NOT DRAWN TO SCALE, dimensions are required to specify exact lengths of piping runs.
Pipe lengths are determined through calculations using coordinates and elevations. Vertical lengths of pipe are calculated using elevations, while horizontal lengths are calculated using north-south and east-west coordinates.
Piping isometrics are generally produced from orthographic drawings and are important pieces of information to engineers. In very complex or large piping systems, piping isometrics are essential to the design and manufacturing phases of a project.
Piping isometrics are often used by designers prior to a stress analysis and are also used by draftsmen to produce shop fabrication spool drawings. Isometrics are the most important drawings for installation contractors during the field portion of the project.
Why is this method used?
Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawings. It is an axonometric projection in which the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees.
When is this method used?
Drawing in isometric projection, normally means drawing very accurately using traditional drawing equipment. This includes using T-Square, set squares, and measuring accurately.
The isometric drawing seen opposite has been drawn precisely, using skills learned through hours of practice. When these skills have been developed, sketching in isometric becomes second nature.
Roles and responsibilities:
Designers also use exploded views to explain their designs to clients/customers and manufacturers. Furthermore, exploded views of products are often supplied to customers, who in turn assemble the product. A good example of this is ‘knock down’ furniture. When the flat pack is opened, an instruction sheet or booklet explains how the furniture is assembled, often in the form of isometric exploded views.
The drawings seen below, were supplied with an instruction booklet. They are two of numerous diagrams drawn in isometric projection. They help explain how the cabinet and all its component parts are assembled, to form the finished product.
These are accurate drawings constructed by a designer, that explain how the product he/she has designed is assembled.