To determine the distance a pipe travels in the north direction, or any other horizontal plane, one must establish the length using two coordinates. If line 01-2-C30-10" turns north on the arrangement drawing, it must also be shown turning north on the iso. ![]() ![]() The elbow is oriented toward the north according to the north arrow. The line begins at nozzle N1 with a flange and elbow welded together, fitting make-up. Use the procedure that follows to render a piping isometric for line 01-2-C30-10".Īs shown in Figure 13-11, line 01-2-C30-10" is attached to vessel V-101 at nozzle N1 and nozzle C of vessel E-101. Piping isometrics are generally drawn to represent the configuration up to and including the first fitting in the piperack. However, this does not apply to a pipe in a pipe-rack. Remember, the isometric must provide a detailed description of the pipe's routing from beginning to end. ![]() By using this information and the isometric symbols that correspond to the various orthographic drawing symbols the pipe drafter can render an isometric describing the pipe's routing. ![]() Drawing symbols, callouts, coordinates, and elevations provide detailed information of the pipe's configuration and routing through the unit. As an isometric for a particular line is developed, constant reference to the piping arrangement, section, or elevation drawings is essential.
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