| GENERAL GAS LAWS & FORMULAS | |||||
Air Velocity in a Pipe:  |
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| V = | Air velocity in feet per second | ||||
| D = | Pipe inside diameter in inches | ||||
| L = | Length of pipe in feet | ||||
| P = | Pressure loss due to air friction in ounces-force/square inch | ||||
| Using this equation and typical values of V, D, and L: approximate values of P are computed as follows: |
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| Velocity | Pipe Diameter in inches, 10 feet long | ||||
| Ft/Sec | 1 | 2 | 4 | 6 | 10 |
| 1 | 0.0004 | 0.0002 | 0.0001 | 0.00007 | 0.00004 |
| 2 | 0.0016 | 0.0008 | 0.0004 | 0.0003 | 0.00016 |
| 5 | 0.0100 | 0.005 | 0.0025 | 0.0017 | 0.001 |
| 10 | 0.04 | 0.02 | 0.01 | 0.0067 | 0.004 |
| 15 | 0.09 | 0.045 | 0.0225 | 0.015 | 0.009 |
| 20 | 0.16 | 0.08 | 0.04 | 0.027 | 0.016 |
| 25 | 0.25 | 0.125 | 0.0625 | 0.0417 | 0.025 |
| 30 | 0.36 | 0.18 | 0.09 | 0.06 | 0.036 |
| (Formula from B.F. Sturtevant Co.) | |||||
