10 Connections
10.7.3 Welding Ends (Butt welded) acc. to ASME B16.25 and ASME B16.9
Only welding ends for wall thicknesses up to 22 mm are described in this chapter.
There are two used standards at LESER:
ASME B16.25 (2003) for a wall thickness from 3 mm up to 10 mm (see figure 10.7.3-1)
ASME B16.9 (2003) for a wall thickness larger than 10 mm (see figure 10.7.3-2).
In most case ASME B16.25is applied.
Figure 10.7.3-1: ASME B16.25 – weld bevel details for
GTAW Root Pass with wall thickness
from 3 mm up to 10 mm
General Notes:
(a)
This detail applies for gas tungsten arc welding (GTAW)
of the root pass where nominal wall thickness is over 3
mm (0.12 inch) to 10 mm (0.38 inch) inclusive
Linear dimensions are in millimeters with inch values in
parentheses
(b)
Figure 10.7.3-2: ASME B16.9 – Plain bevel
From x (2) mm up to 22 mm
General notes:
a.
b.
Dimensions in parentheses are in inches
Other dimensions are in millimeters
Notes:
(1)
(2)
LWN 758.00
edition: 30.06.2010
see ASME B16.9 chapter 8 and fig. 1 for transition
contours
x = 5 (0.19) for carbon steel or ferritic alloy steel and 3
(0.12) for austenitic alloy steel
10.7-4
10 Connections
Dimensions of welding ends [mm]
The standard ASME B16.25 describes welding ends from a nominal size of 2½“ up to 36”. This
extraction deals only with sizes from 2 ½” up to 16”.
The schedule number is a designation system that combines sizes and wall thicknesses for ordering
pipes.
Nominal pipe size
2½”
3”
3½”
4”
5”
6”
8”
10”
12”
14”
16”
O.D. at welding ends
Wrought or fabricated
Schedule no. (1)
components (1)
A
40
73.0
80
73.0
160
73.0
XXS
73.0
40
88.9
80
88.9
160
88.9
XXS
88.9
40
101.6
80
101.6
40
114.3
80
114.3
120
114.3
160
114.3
XXS
114.3
40
141.3
80
141.3
210
141.3
160
141.3
XXS
141.3
40
168.3
80
168.3
120
168.3
160
168.3
XXS
168.3
40
219.1
60
219.1
80
219.1
100
219.1
120
219.1
140
219.1
40
273.0
60
273.0
80
273.0
100
273.0
120
273.0
STD
323.8
40
323.8
XS
323.8
60
323.8
80
323.8
100
323.8
STD
355.6
4XS0
355.6
60
355.6
80
355.6
STD
406.4
40
406.4
60
406.4
80
406.4
Cast components
A
75
75
75
75
91
91
91
91
105
105
117
117
117
117
117
144
144
144
144
144
172
172
172
172
172
223
223
223
223
223
223
278
278
278
278
278
329
329
329
329
329
329
362
362
362
362
413
413
413
413
B
62.5
59
54
45
78
73.5
66.5
58.5
90
85.5
102
97
92
87.5
80
128
122
116
109-5
103
154
146-5
140
132
124.5
203
198.5
193.5
189
182.5
178
254.5
247.5
243
236.5
230
305
303
298.5
295
289
281
336.5
333.5
330
325.5
387.5
381
373
363.5
Table 10.7.3-1: ASME B16.25 – dimensions of welding ends [mm]
Notes:
(1)
LWN 758.00
Data is from ASME B36.10M or a more precise rounding of the inch dimensions from table I-1. Letter designations
signify:
(a) STD = standard wall thickness
(b) XS = extra-strong wall thickness
(c) XXS = double extra-strong wall thickness
edition: 30.06.2010
10.7-5