Steel Pipe Flanges
Reference data and engineering information about steel pipe flanges for piping systems applications.
steelpipeflanges
Overview
Engineering reference data for Steel Pipe Flanges in piping systems.
Key Formulas
Continuity
Mass conservation in pipe flow.
Pressure Drop
Darcy-Weisbach equation.
Pipe Area
Cross-sectional area of a pipe.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Pipe diameter | m | |
| Flow velocity | m/s | |
| Pressure drop | Pa | |
| Friction factor | — |
Flange Dimensional Data
The AWWA C207-94 standard defines slip-on flange dimensions for various pressure classes. The following table consolidates the dimensional data for Classes B, D, E, and F.
32 rows
Class | Pipe Size(inches) | Outside Diameter(inches) | Inside Diameter (Slip on Bore)(inches) | Number of Bolt Holes | Bolt Hole Diameter(inches) | Bolt Circle(inches) | Thickness(inches) |
|---|---|---|---|---|---|---|---|
| B | 4 | 9 | 4.57 | 8 | 0.75 | 7.5 | 0.625 |
| B | 5 | 10 | 5.66 | 8 | 0.875 | 8.5 | 0.625 |
| B | 6 | 11 | 6.72 | 8 | 0.875 | 9.5 | 0.6875 |
| B | 8 | 13.5 | 8.72 | 8 | 0.875 | 11.75 | 0.6875 |
| B | 10 | 16 | 10.88 | 12 | 1 | 14.25 | 0.6875 |
| B | 12 | 19 | 12.88 | 12 | 1 | 17 | 0.6875 |
| B | 14 | 21 | 14.19 | 12 | 1.125 | 18.75 | 0.6875 |
| B | 16 | 23.5 | 16.19 | 16 | 1.125 | 21.25 | 0.6875 |
| D | 4 | 9 | 4.57 | 8 | 0.75 | 7.5 | 0.625 |
| D | 5 | 10 | 5.66 | 8 | 0.875 | 8.5 | 0.625 |
| D | 6 | 11 | 6.72 | 8 | 0.875 | 9.5 | 0.6875 |
| D | 8 | 13.5 | 8.72 | 8 | 0.875 | 11.75 | 0.6875 |
| D | 10 | 16 | 10.88 | 12 | 1 | 14.25 | 0.6875 |
| D | 12 | 19 | 12.88 | 12 | 1 | 17 | 0.8125 |
| D | 14 | 21 | 14.19 | 12 | 1.125 | 18.75 | 0.9375 |
| D | 16 | 23.5 | 16.19 | 16 | 1.125 | 21.25 | 1 |
| E | 4 | 9 | 4.57 | 8 | 0.75 | 7.5 | 1.125 |
| E | 5 | 10 | 5.66 | 8 | 0.875 | 8.5 | 1.1875 |
| E | 6 | 11 | 6.72 | 8 | 0.875 | 9.5 | 1.3125 |
| E | 8 | 13.5 | 8.72 | 8 | 0.875 | 11.75 | 1.5 |
| E | 10 | 16 | 10.88 | 12 | 1 | 14.25 | 1.5625 |
| E | 12 | 19 | 12.88 | 12 | 1 | 17 | 1.75 |
| E | 14 | 21 | 14.19 | 12 | 1.125 | 18.75 | 1.875 |
| E | 16 | 23.5 | 16.19 | 16 | 1.125 | 21.25 | 2 |
| F | 4 | 10 | 4.57 | 8 | 0.875 | 7.875 | 1.13 |
| F | 5 | 11 | 5.66 | 8 | 0.875 | 9.25 | 1.21 |
| F | 6 | 12.5 | 6.72 | 12 | 0.875 | 10.625 | 1.31 |
| F | 8 | 15 | 8.72 | 12 | 1 | 13 | 1.31 |
| F | 10 | 17.5 | 10.88 | 16 | 1.125 | 15.25 | 1.5 |
| F | 12 | 20.5 | 12.88 | 16 | 1.25 | 17.75 | 1.63 |
| F | 14 | 23 | 14.19 | 20 | 1.25 | 20.25 | 1.94 |
| F | 16 | 25.5 | 16.19 | 20 | 1.375 | 22.5 | 2.14 |
Source: AWWA C207-94
Pressure Ratings
The AWWA C207-94 standard defines the following nominal pressure ratings for each flange class:
- Class B: 86 psi
- Class D: 175 - 150 psi
- Class E: 275 psi
- Class F: (Higher pressure, specific rating not listed in source text)