Use the single-line method when speed is essential. Orthographic pipe drawings may be single-line drawings where you draw the center line of the pipe as a thick line and add valves and fittings, or double- line drawings where you draw each valve and fitting. ORTHOGRAPHIC PLUMBING OR PIPE DRAWINGS: Orthographic pipe drawings show single pipes either straight or bent in one plane only. Methods of The two types of projection used in plumbing and piping diagrams are projection orthographic and isometric (pictorial). In this section little differentiation is made between plumbing and piping drawings. For these reasons, DMs should become familiar with plumbing and piping drawings and the plumbing and piping symbols used to show the size and location of pipes, fittings, and valves. Piping is also used as a structural element in columns and handrails. Plumbing/Piping Drawings Introduction Almost every conceivable fluid is handled in pipes during its production, processing, transportation, and use.
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