Chapter 1. Installing Pipe Nozzles
22 T5 Flare Gas Transducer Installation Guide
1.3.4 Installing the First Welding Boss (cont.)
4. Position the welding boss such 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 boss as shown below.
5. Clamp the boss in place using a pipe strap or equivalent so that it cannot move during tack welding.
6. Check the boss alignment, then tack weld the carbon steel boss to the pipe in each of the four grooves between
the boss scribe marks.
7. Remove the clamp and check the alignment again. If the boss is misaligned by 0.02 in. (0.5 mm) or more, remove
the boss, grind off the welds and reinstall the boss.
Oblique Center Line Scribe Mark
Horizontal Scribe Mark
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