Spike's Calculators

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

Nominal Pipe Size
3/8" 1/2" 3/4"
1 1/4" 1 1/2" 2"
2 1/2" 3" 3 1/2"
4" 5" 6"
Tee Run #
Tee Branch #
90° Elbow #
45° Elbow #
Swing Check Valve #
Globe Valve #
Gate Valve #

Results:

Equivalent Length in Feet ft

Calculator

  1. select the nominal diameter of the pipe in inches
  2. enter the number of valves and fittings used in your section of pipe

Results

  1. 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/Valve3/8"1/2"3/4"1"1 1/4"1 1/2"2"2 1/2"3"3 1/2"4"5"
Tee Run0.30.60.80.91.21.52"2.533.6456
Tee Branch1.53456710121518212530
90° Ellbow122.5345781012141720
45° Ellbow0.61.21.51.82.43456781012
Swing Check Valve3578111419222732384654
Globe Valve81520253545556580100125140165
Gate Valve0.20.40.50.60.811.31.622.42.73.34


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