Dimensions of Class 300 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 | 4.88 | 2 | 1.50 | 3.25 | 2.12 | 1.32 | (1) | 1/4 | 3.50 | 4 | 0.69 | 5/8 | 5 |
| 1-1/2 | 6.12 | 2.88 | 1.50 | 3.38 | 2.75 | 1.90 | (1) | 1/4 | 4.50 | 4 | 0.81 | 3/4 | 5.25 |
| 2 | 6.50 | 3.62 | 1.50 | 3.38 | 3.31 | 2.38 | (1) | 1/4 | 5 | 8 | 0.69 | 5/8 | 5 |
| 2-1/2 | 7.50 | 4.12 | 1.50 | 3.50 | 3.94 | 2.88 | (1) | 1/4 | 5.88 | 8 | 0.81 | 3/4 | 5.25 |
| 3 | 8.25 | 5 | 1.50 | 3.50 | 4.62 | 3.50 | (1) | 3/8 | 6.62 | 8 | 0.81 | 3/4 | 5.25 |
| 4 | 10 | 6.19 | 1.50 | 3.62 | 5.75 | 4.50 | (1) | 1/2 | 7.88 | 8 | 0.81 | 3/4 | 5.25 |
| 6 | 12.50 | 8.50 | 1.50 | 3.94 | 8.12 | 6.63 | (1) | 1/2 | 10.62 | 12 | 0.88 | 3/4 | 5.25 |
| 8 | 15 | 10.62 | 1.62 | 4.38 | 10.25 | 8.63 | (1) | 1/2 | 13 | 12 | 1 | 7/8 | 5.75 |
| 10 | 17.50 | 12.75 | 1.88 | 4.62 | 12.62 | 10.75 | (1) | 1/2 | 15.25 | 16 | 1.12 | 1 | 6.50 |
| 12 | 20.50 | 15 | 2 | 5.12 | 14.75 | 12.75 | (1) | 1/2 | 17.75 | 16 | 1.25 | 1-1/8 | 7 |
| 14 | 23 | 16.25 | 2.12 | 5.62 | 16.75 | 14 | (1) | 1/2 | 20.25 | 20 | 1.25 | 1-1/8 | 7.25 |
| 16 | 25.50 | 18.50 | 2.25 | 5.75 | 19 | 16 | (1) | 1/2 | 22.50 | 20 | 1.38 | 1-1/4 | 7.75 |
| 18 | 28 | 21 | 2.38 | 6.25 | 21 | 18 | (1) | 1/2 | 24.75 | 24 | 1.38 | 1-1/4 | 8 |
| 20 | 30.50 | 23 | 2.50 | 6.38 | 23.12 | 20 | (1) | 1/2 | 27 | 24 | 1.38 | 1-1/4 | 8.50 |
| 24 | 36 | 27.25 | 2.75 | 6.62 | 27.62 | 24 | (1) | 1/2 | 32 | 24 | 1.62 | 1-1/2 | 9.50 |
Note - (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
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