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 for Fittings 1/2" to 24"

Nominal Pipe Size

1/2" 3/4" 1"
1 1/4" 1 1/2" 2"
2 1/2" 3" 4"
6" 8" 10"
12" 14" 16"
18" 20" 24"
Gate Valve
#
Angle Valve
#
Globe Valve
#
Swing Check Valve
#
Tee Run
#
Tee Branch
#
90° Elbow
#
45° Elbow
#

Results:

Equivalent Length of Fittings
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
Fitting/Valve1/2"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/Valve6"8"10"12"14"16"18"20"24"
Tee Run12.31417.5202527323542
Tee Branch32.74957677888107118137
90° Ellbow16.72126323743535867
45° Ellbow810.613.515.51820232530
Swing Check Valve50.533.341.849.754.762.570.378.494.3
Angle Valve75.899.8125149164188210235283
Globe Valve172226284338372425478533641
Gate Valve45.36.788.81016.912.515.1


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