ASME/ANSI B16.5 Class 150 LJ

Nominal Pipe Size  Outside Diameter of Flange Thickness of Lap Joint Min. Diameter of Hub Length Through Hub Bore Corner Radius of Bore of Lapped Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approxi-mate Weight kgs
NPS O tf X Y B r W I n  
1/2 90 11.2 30 16 22.9 3 60.3 15.9 4 0.46
3/4 100 12.7 38 16 28.2 3 69.9 15.9 4 0.66
1 110 14.3 49 17 34.9 3 79.4 15.9 4 0.89
1 1/4 115 15.9 59 21 43.7 5 88.9 15.9 4 1.06
1 1/2 125 17.5 65 22 50.0 6 98.4 15.9 4 1.36
2 150 19.1 78 25 62.5 8 120.7 19.1 4 2.10
2 1/2 180 22.3 90 29 75.4 8 139.7 19.1 4 3.58
3 190 23.9 108 30 91.4 10 152.4 19.1 4 4.00
3 1/2 215 23.9 122 32 104.1 10 177.8 19.1 8 4.99
4 230 23.9 135 33 116.8 11 190.5 19.1 8 5.62
5 255 23.9 164 36 144.4 11 215.9 22.2 8 6.38
6 280 25.4 192 40 171.4 13 241.3 22.2 8 7.74
8 345 28.6 246 44 222.2 13 298.5 22.2 8 12.65
10 405 30.2 305 49 277.4 13 362.0 25.4 12 16.65
12 485 31.8 365 56 328.2 13 431.8 25.4 12 27.31
14 535 35.0 400 79 360.2 13 476.3 28.6 12 39.89
16 595 36.6 457 87 411.2 13 539.8 28.6 16 51.18
18 635 39.7 505 97 462.3 13 577.9 31.8 16 57.07
20 700 42.9 559 103 514.4 13 635.0 31.8 20 72.08
24 815 47.7 663 111 616.0 13 749.3 34.9 20 100.11


Standards, Dimensions & Weight of SW Flanges

The Socket Welding Flange is attached to the pipe by a fillet weld around the hub of the flange.

This is eliminates any restriction in flow when using a socket welding flange.

Details of Lap Joint Flange

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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