因此,較小口徑的焊管大都采用直縫焊,大口徑焊管則大多采用螺旋焊。
DN15
|
1/2
|
21.3
|
2.8
|
DN20
|
3/4
|
26.9
|
2.8
|
DN25
|
1
|
33.7
|
3.2
|
DN32
|
1.25
|
42.4
|
3.5
|
DN40
|
1.5
|
48.3
|
3.5
|
DN50
|
2
|
60.3
|
3.8
|
DN65
|
2.5
|
76.1
|
4.0
|
DN80
|
3
|
88.9
|
4.0
|
DN100
|
4
|
114.3
|
4.0
|
DN125
|
5
|
140
|
4.5
|
DN150
|
6
|
168.3
|
4.5
|