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# 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

## Related Topics

• ### Gases and Compressed Air

Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.

## Related Documents

• ### Compressed Air - Air Flow Discharge through Hoses

Discharged air flow volume through hoses with pressure ranging 30 - 90 psi.
• ### Compressed Air - Pipe Line Pressure Loss - Online Calculator with Metric and Imperial Units

Calculate pressure drop in compressed air pipe lines - metric and imperial units.
• ### Compressed Air - Pressure Drop Diagrams, Metric Units

Pressure loss in compressed air pipe lines.
• ### Compressed Air - Size of Pipe vs. Capacity

Air pipe lines capacities at pressure 100 psi (6.9 bar).
• ### Compressed Air Pipe Line Capacity

Capacities of compressed air pipelines - pressure ranging 5 - 250 psi (0.5 - 17 bar).
• ### Compressed Air Pipe Lines - Pressure Loss vs. Capacity and Operating Pressure

Pressure drop in compressed air pipe lines.
• ### Compressed Air Pipes - Fittings and Pressure Loss

Fittings in compressed air pipe lines and equivalent length pressure drop.
• ### Compressed Air Piping - Pressure Loss Diagrams, Imperial Units

Pressure drop in compressed air pipelines with applied pressure 50, 100 and 150 psi.

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## Citation

• The Engineering ToolBox (2009). Compressed Air - Friction Loss in Hoses. [online] Available at: https://www.engineeringtoolbox.com/air-hose-friction-d_1536.html [Accessed Day Month Year].

Modify the access date according your visit.

6.3.17

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