Dimensions of Class 2500 RF Orifice WN Flanges as per ASME B16.36.
All other dimensions are in "inches" 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 | 6.25 | 2 | 1.50 | 3.62 | 2.25 | 1.32 | (1) | 1/4 | 4.25 | 4 | 1 | 7/8 | 6 |
| 1-1/2 | 8 | 2.88 | 1.75 | 4.38 | 3.12 | 1.90 | (1) | 1/4 | 5.75 | 4 | 1.25 | 1-1/8 | 7 |
| 2 | 9.25 | 3.62 | 2 | 5 | 3.75 | 2.38 | (1) | 1/4 | 6.75 | 8 | 1.12 | 1 | 7.25 |
| 2-1/2 | 10.50 | 4.12 | 2.25 | 5.62 | 4.50 | 2.88 | (1) | 1/4 | 7.75 | 8 | 1.25 | 1-1/8 | 8 |
| 3 | 12 | 5 | 2.62 | 6.62 | 5.25 | 3.50 | (1) | 3/8 | 9 | 8 | 1.38 | 1-1/4 | 9 |
| 4 | 14 | 6.19 | 3 | 7.50 | 6.50 | 4.50 | (1) | 1/2 | 10.75 | 8 | 1.62 | 1-1/2 | 10.25 |
| 6 | 19 | 8.50 | 4.25 | 10.75 | 9.25 | 6.63 | (1) | 1/2 | 14.50 | 8 | 2.12 | 2 | 13.75 |
| 8 | 21.75 | 10.62 | 5 | 12.50 | 12 | 8.63 | (1) | 1/2 | 17.25 | 12 | 2.12 | 2 | 15.25 |
| 10 | 26.50 | 12.75 | 6.50 | 16.50 | 14.75 | 10.75 | (1) | 1/2 | 21.25 | 12 | 2.62 | 2-1/2 | 19.25 |
| 12 | 30 | 15 | 7.25 | 18.25 | 17.38 | 12.75 | (1) | 1/2 | 24.38 | 12 | 2.88 | 2-3/4 | 21.25 |
Note - (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.