Chapter 2. Installing the Pipe Nozzles
48
Model T17 Installation Guide
2.4.4 Installing the First Welding Boss - MR2 Mid-Radius (cont.)
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
below.
Figure 59: Scribing the Oblique Centerline
Table 9: X Values for Common Pipe Sizes with 0.375” Wall Thickness
Pipe OD
X Dimension
NPS (inches)
DN (mm)
inches
mm
26
650
0.502
12.76
28
700
0.501
12.72
30
750
0.499
12.68
32
800
0.498
12.65
34
N/A
0.497
12.62
36
900
0.496
12.59
38
N/A
0.495
12.57
40
1000
0.494
12.55
42
1050
0.493
12.53
44
1100
0.493
12.51
46
N/A
0.492
12.50
48
1200
0.492
12.49
52
1300
0.491
12.46
54
N/A
0.490
12.45
56
1400
0.490
12.44
60
1500
0.489
12.42
64
1600
0.488
12.41
66
N/A
0.488
12.40
Oblique
Centerline
True Centerline
Oblique Centerline
Ends at Horizontal Line
x
