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2.2.4 Installing the First Welding Boss - Diametrical (cont.)
3. Position the welding boss so that the four scribe lines on the welding boss are lined up with the horizontal
scribe mark and the oblique center line on the pipe. Make sure you orient the tapered end of the welding boss
against the pipe as shown in Figure 18 below.
4. Clamp the welding boss in place using a pipe strap or equivalent, so that it cannot move during tack welding.
5. Check the boss alignment, then tack weld the carbon steel welding boss to the pipe in each of the four grooves
between the welding boss scribe marks.
6. Remove the clamp and check the welding boss alignment again. If the welding boss is misaligned by
0.02 in. (0.5 mm) or more, remove the welding boss, grind off the welds and reinstall it.
Model T17 Installation Guide
Oblique Center Line Scribe Mark
Figure 18: Welding Boss Orientation
Chapter 2. Installing the Pipe Nozzles
Top View
Horizontal Scribe Mark
Side View
13
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