Compressed Air - Friction Loss in Hoses
Friction loss in air hoses vs. operating pressure.
Compressed air friction loss in hoses are indicated below. Gauge pressure
- 50 psi - black line
- 70 psi - red line
- 90 psi - yellow line
- 110 psi - blue line
- 1 psig = 6.9 kPa = 0.069 bar
- 1 inch = 25.4 mm
- 1 ft (foot) = 0.3048 m
- 1 scfm = 0.472 nl/s
Example - Pressure Loss in Compressed Air Hose
The air flow in a 3/4" pipeline with 90 psi pressure is 30 cfm.
From the second diagram above we can estimate the friction loss to be approximately 0.4 psi/50 ft.
The friction loss in a 10 ft hose can be calculated as
(0.4 psi/50 ft) (10 ft) / (50 ft) = 0.08 psi
