Dimensions of Class 300 RF Orifice WN Flanges as per ASME B16.36.
Nominal Pipe Size, Diameter of Bolt Hole and Diameter of Stud Bolts are specified in inches.
All other dimensions are in "mm" unless noted otherwise.
| NPS inch |
OD of Flange (O) |
Dia of Raised Face (R) |
Min Thk of Flange (T) |
Weld Neck Length (Y) |
Hub Dia at Base (X) |
Hub Dia at End (A) |
Weld Neck Bore (B) |
Dia of Tap (Tt) |
Bolt |
No. of Bolt Holes |
Dia of Bolt Holes |
Dia of Bolts |
Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 125 | 50.8 | 36.6 | 81 | 54 | 33.4 | (1) | 6.4 | 88.9 | 4 | 11/16 | 5/8 | 125 |
| 1-1/2 | 155 | 73 | 36.6 | 84 | 70 | 48.3 | (1) | 6.4 | 114.3 | 4 | 13/16 | 3/4 | 135 |
| 2 | 165 | 92.1 | 36.6 | 84 | 84 | 60.3 | (1) | 6.4 | 127 | 8 | 11/16 | 5/8 | 125 |
| 2-1/2 | 190 | 104.8 | 36.6 | 87 | 100 | 73 | (1) | 6.4 | 149.2 | 8 | 13/16 | 3/4 | 135 |
| 3 | 210 | 127 | 36.6 | 87 | 117 | 88.9 | (1) | 9.5 | 168.3 | 8 | 13/16 | 3/4 | 135 |
| 4 | 255 | 157.2 | 36.6 | 90 | 146 | 114.3 | (1) | 12.7 | 200 | 8 | 13/16 | 3/4 | 135 |
| 6 | 320 | 215.9 | 36.6 | 98 | 206 | 168.3 | (1) | 12.7 | 269.9 | 12 | 7/8 | 3/4 | 135 |
| 8 | 380 | 269.9 | 39.7 | 110 | 260 | 219.1 | (1) | 12.7 | 330.2 | 12 | 1 | 7/8 | 145 |
| 10 | 445 | 323.8 | 46.1 | 116 | 321 | 273 | (1) | 12.7 | 387.4 | 16 | 1-1/8 | 1 | 165 |
| 12 | 520 | 381 | 49.3 | 129 | 375 | 323.8 | (1) | 12.7 | 450.8 | 16 | 1-1/4 | 1-1/8 | 180 |
| 14 | 585 | 412.8 | 52.4 | 141 | 425 | 355.6 | (1) | 12.7 | 514.4 | 20 | 1-1/4 | 1-1/8 | 185 |
| 16 | 650 | 469.9 | 55.6 | 144 | 483 | 406.4 | (1) | 12.7 | 571.5 | 20 | 1-3/8 | 1-1/4 | 195 |
| 18 | 710 | 533.4 | 58.8 | 157 | 533 | 457 | (1) | 12.7 | 628.6 | 24 | 1-3/8 | 1-1/4 | 205 |
| 20 | 775 | 584.2 | 62 | 160 | 587 | 508 | (1) | 12.7 | 685.8 | 24 | 1-3/8 | 1-1/4 | 215 |
| 24 | 915 | 692.2 | 68.3 | 167 | 702 | 610 | (1) | 12.7 | 812.8 | 24 | 1-5/8 | 1-1/2 | 240 |
Note - (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.