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The crossing of pipes without connections is normally shown without interrupting the line representing the hidden line (fig. 5-5, view A). But when there is a need to show that one pipe must pass behind another, the line representing the pipe farthest from the viewer will be shown with a break, or interruption, where the other pipe passes in front of it, as shown in figure 5-5, view B. CONNECTIONS Permanent connections, whether made by welding or other processes such as gluing or soldering, should be shown on the drawing by a heavy dot (fig. 5-6). The draftsman normally will use a general note or specification to describe the type of connection. Detachable connections are shown by a single thick line (figs. 5-6 and 5-7). The specification, a general note, or bill of material will list the types of connections such as flanges, unions, or couplings and whether the fittings are flanged or threaded.
Figure 5-4.-Double-line pictorial piping drawing.
Figure 5-5.-Crossing of pipes.
Figure 5-7.-Adjoining apparatus. |
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