Friction Loss

Occurs in pipelines and tubing

Inadequate tubing diameters or angled hose joints and flow-through obstructions in tubing connections impact the flow rate. For optimal pump performance, select the largest tubing diameter possible. Refer to the chart below for help.

Flow rate
(gallons/hour)
Tubing
inner diameter
Pressure loss
per 10 ft. pipe
Pressure loss
per 90° elbow
Pressure loss
per 90° elbow (long radius)
240 0.5" 0.6 psi / 1.37 ft. 0.1 psi / 0.21 ft. 0.09 psi / 0.21 ft.
480 0.5" 1.25 psi / 2.9 ft. 0.2 psi / 0.46 ft. 0.19 psi / 0.44 ft.
480 0.75" 0.32 psi / 0.74 ft. 0.08 psi / 0.20 ft. 0.06 psi / 0.13 ft.
780 0.75" 2.33 psi / 5.37 ft. 0.61 psi / 1.40 ft. 0.41 psi / 0.94 ft.
780 1" 0.57 psi / 1.36 ft. 0.23 psi / 0.54 ft. 0.11 psi / 0.27 ft.
1200 1" 0.92 psi / 2.12 ft. 0.37 psi / 0.85 ft. 0.18 psi / 0.42 ft.
1800 1" 1.47 psi / 3.41 ft. 0.59 psi / 1.36 ft. 0.29 psi / 0.68 ft.
1800 1.25" 0.51 psi / 1.18 ft. 0.25 psi / 0.56 ft. 0.11 psi / 0.27 ft.
2400 1.25" 0.87 psi / 2.01 ft. 0.41 psi / 0.94 ft. 0.20 psi / 0.45 ft.
1800 1.5" 0.24 psi / 0.56 ft. 0.13 psi / 0.31 ft. 0.07 psi / 0.17 ft.
2400 1.5" 0.41 psi / 0.95 ft. 0.23 psi / 0.52 ft. 0.12 psi / 0.29 ft.
3000 1.5" 0.62 psi / 1.44 ft. 0.34 psi / 0.79 ft. 0.19 psi / 0.44 ft.
3600 1.5" 0.87 psi / 2.01 ft. 0.48 psi / 1.11 ft. 0.26 psi / 0.60 ft.
3000 2" 0.18 psi / 0.43 ft. 0.13 psi / 0.30 ft. 0.09 psi / 0.22 ft.
3600 2" 0.26 psi / 0.6 ft. 0.18 psi / 0.42 ft. 0.13 psi / 0.30 ft.
4200 2" 0.34 psi / 0.79 ft. 0.24 psi / 0.55 ft. 0.17 psi / 0.40 ft.
4800 2" 0.44 psi / 1.02 ft. 0.31 psi / 0.72 ft. 0.22 psi / 0.51 ft.
5400 2" 0.52 psi / 1.2 ft. 0.36 psi / 0.84 ft. 0.26 psi / 0.60 ft.
6000 2" 0.65 psi / 1.5 ft. 0.18 psi / 0.42 ft. 0.15 psi / 0.35 ft.
6000 3" 0.09 psi / 0.22 ft. 0.04 psi / 0.10 ft. 0.35 psi / 0.08 ft.
7500 3" 0.14 psi / 0.33 ft. 0.06 psi / 0.14 ft. 0.05 psi / 0.12 ft.
9000 3" 0.20 psi / 0.46 ft. 0.08 psi / 0.19 ft. 0.07 psi / 0.16 ft.
10500 3" 0.27 psi / 0.62 ft. 0.1 psi / 0.23 ft. 0.09 psi / 0.21 ft.
12000 3" 0.34 psi / 0.79 ft. 0.13 psi / 0.30 ft. 0.11 psi / 0.26 ft.