GE T17 Installation Manual page 39

2.3.4 Installing the First Welding Boss - MR1 Mid-Radius (cont.)
3. Position the first welding boss such that the three scribe lines on the welding boss are lined up with the
horizontal scribe mark and the oblique center line on the pipe. Make sure that you orient the boss as shown in
Figure 39 below.
Oblique Center Line Scribe Mark
4. Clamp the welding boss in place using a pipe strap or equivalent, so that it cannot move during tack welding.
5. Check the welding boss alignment, then tack weld the carbon steel boss to the pipe in each of the four grooves
between the welding boss scribe marks.
6. Remove the pipe strap and check the alignment again. If the welding boss is misaligned by 0.02 in. (0.5 mm) or
more, you must remove the welding boss, grind off the welds and reinstall the welding boss.
Model T17 Installation Guide
2nd Boss
1st Boss
1st Boss
Figure 39: Tack Welding the First Welding Boss
Top View
Flow Direction
Horizontal Scribe Mark
2nd Boss
Side View
Chapter 2. Installing the Pipe Nozzles
31