ASME/ANSI B16.5 Class 150 SO

Nominal Pipe Size  Outside Diameter of Flange Diameter of Raised Face Thickness of Flanges Min. Diameter of Hub Length Through Hub Bore Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approximate Weight kgs
NPS O R tf X Y B W I n  
1/2 90 34.9 9.6 30 14 22.2 60.3 15.9 4 0.41
3/4 100 42.9 11.2 38 14 27.7 69.9 15.9 4 0.59
1 110 50.8 12.7 49 16 34.5 79.4 15.9 4 0.82
1 1/4 115 63.5 14.3 59 19 43.2 88.9 15.9 4 0.99
1 1/2 125 73.0 15.9 65 21 49.5 98.4 15.9 4 1.28
2 150 92.1 17.5 78 24 61.9 120.7 19.1 4 2.01
2 1/2 180 104.8 20.7 90 27 74.6 139.7 19.1 4 3.41
3 190 127.0 22.3 108 29 90.7 152.4 19.1 4 3.88
3 1/2 215 139.7 22.3 122 30 103.4 177.8 19.1 8 4.80
4 230 157.2 22.3 135 32 116.1 190.5 19.1 8 5.45
5 255 185.7 22.3 164 35 143.8 215.9 22.2 8 6.22
6 280 215.9 23.9 192 38 170.7 241.3 22.2 8 7.57
8 345 269.9 27.0 246 43 221.5 298.5 22.2 8 12.42
10 405 323.8 28.6 305 48 276.2 362.0 25.4 12 16.47
12 485 381.0 30.2 365 54 327.0 431.8 25.4 12 26.80
14 535 412.8 33.4 400 56 359.2 476.3 28.6 12 35.21
16 595 469.9 35.0 457 62 410.5 539.8 28.6 16 44.61
18 635 533.4 38.1 505 67 461.8 577.9 31.8 16 49.19
20 700 584.2 41.3 559 71 513.1 635.0 31.8 20 62.62
24 815 692.2 46.1 663 81 616.0 749.3 34.9 20 88.23


Standards, Dimensions & Weight of Slip on flanges

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding.

Details of Slip On flange
1. Slip On flange 2. Filled weld outside 3. Filled weld inside 4. Pipe

Most common flange types

Regardless of custom sizing or specifications, the fundamental design of most flanges falls under six common styles created to close, connect, cover, or support pipes and pipe systems.



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