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Flange Sizing and Tightening
Nominal Pipe Size (inches)
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1/4
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
5
6
8
10
12
14
16
18
20
24
Class
150
300
400
600
900
1500
2500