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# Compressed Air - Size of Pipe vs. Capacity

## Air pipe lines capacities at pressure 100 psi (6.9 bar).

Recommended air pipe line sizes with schedule 40 steel pipes and air pressure 100 psi (6.9 bar, 689500 Pa):

Compressed Air - Recommended Size of Pipe vs. Capacity

Free Air Flow
(cfm)
Recommended Pipe Size (inches)
Length of Pipe (feet)
255075100150200250
5 1/2 1/2 1/2 1/2 1/2 1/2 1/2
10 1/2 1/2 1/2 1/2 1/2 1/2 1/2
15 1/2 1/2 1/2 1/2 3/4 3/4 3/4
20 1/2 1/2 3/4 3/4 3/4 3/4 3/4
25 1/2 3/4 3/4 3/4 3/4 1 1
30 1/2 3/4 3/4 3/4 1 1 1
35 3/4 3/4 3/4 3/4 1 1 1
40 3/4 3/4 3/4 1 1 1 1
45 3/4 3/4 1 1 1 1 1 1/4
50 3/4 1 1 1 1 1 1/4 1 1/4
55 3/4 1 1 1 1 1/4 1 1/4 1 1/4
60 3/4 1 1 1 1 1/4 1 1/4 1 1/4
65 3/4 1 1 1 1 1/4 1 1/4 1 1/4
70 3/4 1 1 1 1/4 1 1/4 1 1/4 1 1/4
75 1 1 1 1 1/4 1 1/4 1 1/4 1 1/4
80 1 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4
85 1 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4
90 1 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/2
95 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 1 1/2
100 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/2 1 1/2

## 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 - Friction Loss in Hoses

Friction loss in air hoses vs. operating pressure.
• ### 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 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.
• ### Pneumatic Piping - Pressure Loss vs. Air Flow

Pressure loss in pneumatic tubes - sizes ranging 5 - 36 mm.

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## Citation

• The Engineering ToolBox (2009). Compressed Air - Size of Pipe vs. Capacity. [online] Available at: https://www.engineeringtoolbox.com/air-line-pipe-sizes-d_1522.html [Accessed Day Month Year].

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7.8.15

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