Compressed Air - Size of Pipe vs. Capacity

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

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

Recommended Pipe Size (inches)
Free Air Flow (cfm)	Length of Pipe (feet)
Free Air Flow (cfm)	25	50	75	100	150	200	250
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

Steel Pipe Schedule 40 - metric dimensions

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Compressed Air - Size of Pipe vs. Capacity

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

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