In the piping discipline a north arrow is used as a “point of reference.” Accurate isometric layout is based on the correlation of the orientation of the north arrow on the Piping Arrangement drawing and the north arrow on the piping isometric. Figure 13.8 illustrates the representation of the north arrow on the arrangement drawing and the north arrow on the isometric. Piping “isometric” and “spool” drawings shows a complete line from one piece of equipment to another. It gives all information necessary for fabrication and erection of piping. Items and information that are shown on an ISO include the following: The various runs of pipe, fittings, and valves should be roughly in proportion for easy understanding.
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