Calculate the equivalent length of straight pipe for valves and fittings in feet.
The equivalent length of valves and fittings is an important parameter used in fluid mechanics to account for the additional pressure drop caused by the presence of various fittings and valves in a pipeline. This parameter is expressed as a length of straight pipe that would cause the same pressure drop as the fitting or valve under consideration. The equivalent length of valves and fittings is typically determined experimentally. It can vary depending on factors such as the type of fitting or valve, the flow rate, and the fluid properties.
| Equivalent Length in Feet for Fittings and Valves | |||||||||
| Fitting/Valve | 1/2" | 3/4" | 1" | 1 1/4" | 1 1/2" | 2" | 2 1/2" | 3" | 4" |
| Tee Run | 1 | 1.4 | 1.7 | 2.3 | 2.7 | 4 | 4.9 | 6.1 | 7.9 |
| Tee Branch | 3.8 | 4.9 | 6 | 7.3 | 8.4 | 12 | 14.7 | 16.4 | 22 |
| 90° Ellbow | 1.5 | 2 | 2.5 | 3.8 | 4 | 5.7 | 6.9 | 7.9 | 11.4 |
| 45° Ellbow | 0.8 | 1.1 | 1.4 | 1.8 | 2.1 | 2.6 | 3.1 | 4 | 5.1 |
| Swing Check Valve | 5.2 | 6.9 | 8.7 | 11.5 | 13.4 | 17.2 | 20.6 | 25.5 | 33.6 |
| Angle Valve | 7.8 | 10.3 | 13.1 | 17.3 | 20.1 | 25.8 | 30.9 | 38.4 | 50.3 |
| Globe Valve | 17.6 | 23.3 | 29.7 | 39.1 | 45.6 | 58.6 | 20 | 86.9 | 114 |
| Gate Valve | 0.4 | 0.6 | 0.7 | 0.9 | 1.1 | 1.4 | 1.7 | 2 | 2.7 |
| Equivalent Length in Feet for Fittings and Valves | |||||||||
| Fitting/Valve | 6" | 8" | 10" | 12" | 14" | 16" | 18" | 20" | 24" |
| Tee Run | 12.3 | 14 | 17.5 | 20 | 25 | 27 | 32 | 35 | 42 |
| Tee Branch | 32.7 | 49 | 57 | 67 | 78 | 88 | 107 | 118 | 137 |
| 90° Ellbow | 16.7 | 21 | 26 | 32 | 37 | 43 | 53 | 58 | 67 |
| 45° Ellbow | 8 | 10.6 | 13.5 | 15.5 | 18 | 20 | 23 | 25 | 30 |
| Swing Check Valve | 50.5 | 33.3 | 41.8 | 49.7 | 54.7 | 62.5 | 70.3 | 78.4 | 94.3 |
| Angle Valve | 75.8 | 99.8 | 125 | 149 | 164 | 188 | 210 | 235 | 283 |
| Globe Valve | 172 | 226 | 284 | 338 | 372 | 425 | 478 | 533 | 641 |
| Gate Valve | 4 | 5.3 | 6.7 | 8 | 8.8 | 10 | 16.9 | 12.5 | 15.1 |