Irrigation
Equivalent Length of Valves and Fittings
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 Valves and Fittings
Calculator
- select the nominal diameter of the pipe in inches
- enter the number of valves and fittings used in your section of pipe
Results
- the equivalent length in straight pipe calculated from the valves and fittings in feet
| Equivalent Length in Feet for Fittings and Valves (CIDWT, 2008) | |||||||||||||
| Fitting/Valve | 3/8" | 1/2" | 3/4" | 1" | 1 1/4" | 1 1/2" | 2" | 2 1/2" | 3" | 3 1/2" | 4" | 5" | |
| Tee Run | 0.3 | 0.6 | 0.8 | 0.9 | 1.2 | 1.5 | 2" | 2.5 | 3 | 3.6 | 4 | 5 | 6 |
| Tee Branch | 1.5 | 3 | 4 | 5 | 6 | 7 | 10 | 12 | 15 | 18 | 21 | 25 | 30 |
| 90° Ellbow | 1 | 2 | 2.5 | 3 | 4 | 5 | 7 | 8 | 10 | 12 | 14 | 17 | 20 |
| 45° Ellbow | 0.6 | 1.2 | 1.5 | 1.8 | 2.4 | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 12 |
| Swing Check Valve | 3 | 5 | 7 | 8 | 11 | 14 | 19 | 22 | 27 | 32 | 38 | 46 | 54 |
| Globe Valve | 8 | 15 | 20 | 25 | 35 | 45 | 55 | 65 | 80 | 100 | 125 | 140 | 165 |
| Gate Valve | 0.2 | 0.4 | 0.5 | 0.6 | 0.8 | 1 | 1.3 | 1.6 | 2 | 2.4 | 2.7 | 3.3 | 4 |
Cisterns, Tanks and Rainwater Harvesting
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- Capacity of a Round Cistern - Metric measurements
- Capacity of a Square or Rectangular Shaped Cistern - Imperial measurements
- Capacity of a Square or Rectangular Shaped Cistern - Metric measurements
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Water Flow Rate Calculators
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Conversions
- Decimal Foot to Decimal Inch - Decimal Inch to Decimal Foot
- Decimal Inch and Foot to Metres and Millimetres