Flange - Orifice, Weld Neck, ANSI Class 300, B16.36 (in)
- Dimensions to ASME B16.36 - Orifice Flanges
- Bolt circle diameters are 1/8 inch larger than bolt diameter.
- All dimensions except "Thickness of Flange C sizes 1" are the same as a Weld Neck.
- Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.
| Pipe Size
(NPS) | Outside
Diameter of Flange A | Diameter
of Raised Face B | Thickness
of Flange
| Diameter
of Bore
| Diameter
of Hub at Weld
| Diameter
of Hub at Base
| Length
of Hub
| Number
of Bolt Holes NBH | Diameter
of Bolt Holes DBH | Bolt
Circle Diameter
| Approx.
Weight Per Union (lb) AW |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | - | - | - | - | - | - | - | - | - | - | - |
| 3/4 | - | - | - | - | - | - | - | - | - | - | - |
| 1 | 4 7/8 | 2 | 1 1/2 | 1.049 | 1.315 | 2 1/8 | 2 7/16 | 4 | 3/4 | 3 1/2 | 18 |
| 1 1/4 | 5 1/4 | 2 1/2 | 1 1/2 | 1.380 | 1.660 | 2 1/2 | 2 9/16 | 4 | 3/4 | 3 7/8 | 20 |
| 1 1/2 | 6 1/8 | 2 7/8 | 1 1/2 | 1.610 | 1.900 | 2 3/4 | 2 11/16 | 4 | 7/8 | 4 1/2 | 25 |
| 2 | 6 1/2 | 3 5/8 | 1 1/2 | 2.067 | 2.375 | 3 5/16 | 2 3/4 | 8 | 3/4 | 5 | 27 |
| 2 1/2 | 7 1/2 | 4 1/8 | 1 1/2 | 2.469 | 2.875 | 3 15/16 | 3 | 8 | 7/8 | 5 7/8 | 35 |
| 3 | 8 1/4 | 5 | 1 1/2 | 3.068 | 3.500 | 4 5/8 | 3 1/8 | 8 | 7/8 | 6 5/8 | 43 |
| 3 1/2 | - | - | - | - | - | - | - | - | - | - | - |
| 4 | 10 | 6 3/16 | 1 1/2 | 4.026 | 4.500 | 5 3/4 | 3 3/8 | 8 | 7/8 | 7 7/8 | 66 |
| 5 | 11 | 7 5/16 | 1 1/2 | 5.047 | 5.563 | 7 | 3 7/8 | 8 | 7/8 | 9 1/4 | 78 |
| 6 | 12 1/2 | 8 1/2 | 1 1/2 | 6.065 | 6.625 | 8 1/8 | 3 7/8 | 12 | 7/8 | 10 5/8 | 106 |
| 8 | 15 | 10 5/8 | 1 5/8 | 7.981 | 8.625 | 10 1/4 | 4 3/8 | 12 | 1 | 13 | 152 |
| 10 | 17 1/2 | 12 3/4 | 1 7/8 | 10.020 | 10.750 | 12 5/8 | 4 5/8 | 16 | 1 1/8 | 15 1/4 | 216 |
| 12 | 20 1/2 | 15 | 2 | 12.00 | 12.750 | 14 3/4 | 5 1/8 | 16 | 1 1/4 | 17 3/4 | 327 |
| 14 | 23 | 16 1/4 | 2 1/8 | 13.25 | 14.00 | 16 3/4 | 5 5/8 | 20 | 1 1/4 | 20 1/4 | 448 |
| 16 | 25 1/2 | 18 1/2 | 2 1/4 | 15.25 | 16.00 | 19 | 5 3/4 | 20 | 1 3/8 | 22 1/2 | 596 |
| 18 | 28 | 21 | 2 3/8 | 17.25 | 18.00 | 21 | 6 1/4 | 24 | 1 3/8 | 24 3/4 | 741 |
| 20 | 30 1/2 | 23 | 2 1/2 | 19.25 | 20.00 | 23 1/8 | 6 3/8 | 24 | 1 3/8 | 27 | 887 |
| 22 | 33 | 25 1/4 | 2 5/8 | 21.25 | 22.00 | 25 1/4 | 6 1/2 | 24 | 1 5/8 | 29 1/4 | 1040 |
| 24 | 36 | 27 1/4 | 2 3/4 | 23.25 | 24.00 | 27 5/8 | 6 5/8 | 24 | 1 5/8 | 32 | 1311 |