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Equivalent Length of Valves and Fittings Calculation

For pipes with a nominal diameter from 1/2" to 24 inches

There is certain amount of pressure loss in straight pipe and in addition valves and fittings in a section of pipe will add to the overall pressure loss that occurs in a section of pipe.
Calculate friction losses for fittings and valves in a section of pipe expressed in equivalent length of pipe (in feet).

Example:
Your section of 2" pipe has 2 x gate valves, 2 x 90° elbows, 4 x straight true tee's and 12 branch tee's
Select 2" for nominal pipe size and enter 2 gate valves, 2 90° elbows, 4 straight true tee's and 12 branch tee's.
Result = this will add 174.2 feet in straight pipe.

Equivalent Length for Fittings 1/2" to 24"

Nominal Pipe Size
1/2" 3/4" 1"
1 1/14" 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

Calculation

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

Results

  1. equivalent length of straight pipe in feet calculated from the valves and fittings
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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