Compressed Air - Air Flow and Recommended Pipe Size

Pipe line sizing for compressed air systems at 90 psig (620 kPa, 6.2 bar). Reference tables for recommended pipe diameters based on air flow rate and line length.

Line Length (ft)	Line Length (m)	Flow Rate (scfm)	Flow Rate (nl/s)	Recommended Pipe Size (inches)	Recommended Pipe Size (mm)
50	15.24	10	4.72	0.5	12.7
50	15.24	20	9.44	0.75	19.05
50	15.24	40	18.88	1	25.4
50	15.24	60	28.32	1.25	31.75
50	15.24	100	47.2	1.5	38.1
100	30.48	10	4.72	0.75	19.05
100	30.48	20	9.44	1	25.4
100	30.48	40	18.88	1.25	31.75
100	30.48	60	28.32	1.5	38.1
100	30.48	100	47.2	2	50.8
300	91.44	10	4.72	1	25.4
300	91.44	20	9.44	1.25	31.75
300	91.44	40	18.88	1.5	38.1
300	91.44	60	28.32	2	50.8
300	91.44	100	47.2	2.5	63.5

Reference Information

Operating Pressure: 90 psig (620 kPa, 6.2 bar)

Unit Conversions:

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

Notes:

Select pipe size based on your line length and required flow rate
Recommended sizes account for acceptable pressure drop in the system
Oversizing the pipe reduces pressure drop and energy consumption
Undersizing the pipe increases pressure drop and may cause equipment issues

Compressed Air - Air Flow and Recommended Pipe Size | MEPKit Engineering Tools | MEPKit