GE T17 Installation Manual page 38

Chapter 2. Installing the Pipe Nozzles
2.3.4 Installing the First Welding Boss - MR1 Mid-Radius (cont.)
Table 5: X Values for Common Pipe Sizes with 0.375" Wall Thickness
NPS (inches)
2. Scribe the oblique center line on the pipe from the horizontal scribe line upward around the pipe, at the
calculated or tabulated distance from the true center line. The oblique center line should be marked on the side
of the true center line that is closer to the second nozzle location. One end of the oblique centerline should stop
at the horizontal scribe line, as shown in Figure 38 below.
30
Pipe OD
DN (mm)
26 650
28 700
30 750
32 800
34 N/A
36 900
38 N/A
40 1000
42 1050
44 1100
46 N/A
48 1200
52 1300
54 N/A
56 1400
60 1500
64 1600
66 N/A
True Centerline
Figure 38: Scribing the Oblique Centerline
X Dimension
inches
0.502
0.501
0.499
0.498
0.497
0.496
0.495
0.494
0.493
0.493
0.492
0.492
0.491
0.490
0.490
0.489
0.488
0.488
Oblique Centerline
x
Oblique Centerline
Ends at Horizontal Line
mm
12.76
12.72
12.68
12.65
12.62
12.59
12.57
12.55
12.53
12.51
12.50
12.49
12.46
12.45
12.44
12.42
12.41
12.40
Model T17 Installation Guide