The last 90° elbow we will mention is the mitered elbow. The mitered elbow is not an actual fitting, but instead is a manufactured turn in the piping system. This elbow is made by making angular cuts in a straight run of pipe and then welding the cuts together after they have been rolled to a different angle (see Figure 46).

The mitered elbow may be classified as one, two, three, or four weld miters. The number of welds used depends on the smoothness of flow required through the turn. A two weld miter will create more turbulence within the pipe than will a four-weld miter.

Fig.46 Mitered elbows

Drawing symbols for mitered elbows

Figure 47 shows the double-line draughting symbols for two-weld and three-weld mitered elbows. Unlike the previous elbows, the weld lines in the adjacent views of the mitered elbow are represented by ellipses.

Ellipses are used because the welds are not perpendicular to your line of sight. Therefore, when projecting from the front view to any of the four adjoining views, the welds must be drawn elliptical in shape.

Fig.47 Mitre elbows drawing symbols

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