Orthographic projection is used to show multiple views of an object in a single plane. Two methods of projection used in pipe drawings are orthographic and isometric (pictorial). A set of symbols has been developed to identify these features on drawings. Piping drawings show the size and location of pipes, fittings, and valves. For these reasons contractors, manufacturers, and engineers should become familiar with pipe drawings. Piping is also used as a structural element in columns and handrails. The age of atomic energy and rocket power has added fluids such as liquid metals, oxygen, and nitrogen to the list of more common fluids such as oil, water, gases, and acids that are being carried in piping systems today. Today almost every conceivable fluid is handled in pipes during its production, processing, transportation, and use. Water was at one time the only important fluid that was moved from one point to another in pipes.
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