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Air Line Pipe Size

Figures in body of chart are pipe sizes on a 100 PSI air system to carry air at about a 1 PSI per 100 feet pressure loss. When measuring piping distances, to be conservative, count each pipe fitting as equal to 5 feet of pipe. At other than 100 PSI, flow capacity will be in inverse proportion to pressure (as based on PSIA (absolute) pressure levels and calculated by Boyle's Law).

SCFM
Length of Run - Feet
Flow
25
50
75
100
150
200
300
500
1000
6
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3/4
3/4
18
1/2
1/2
1/2
3/4
3/4
3/4
3/4
1
1
30
3/4
3/4
3/4
3/4
1
1
1
1-1/4
1-1/4
45
3/4
3/4
1
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
1-1/2
1-1/2
90
1
1
1-1/4
1-1/4
1-1/4
1-1/4
1-1/2
1-1/2
2
120
1
1-1/4
1-1/4
1-1/4
1-1/2
1-1/2
1-1/2
2
2
150
1-1/4
1-1/4
1-1/4
1-1/2
1-1/2
2
2
2
2-1/2
180
1-1/4
1-1/2
1-1/2
1-1/2
2
2
2
2-1/2
2-1/2
240
1-1/4
1-1/2
1-1/2
2
2
2
2-1/2
2-1/2
3
300
1-1/2
2
2
2
2
2-1/2
2-1/2
3
3
360
1-1/2
2
2
2
2-1/2
2-1/2
2-1/2
3
3
450
2
2
2
2-1/2
2-1/2
3
3
3
3-1/2
600
2
2-1/2
2-1/2
2-1/2
3
3
3
3-1/2
4
750
2
2-1/2
2-1/2
3
3
3
3-1/2
3-1/2
4

 

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