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Relationship Between Flow Velocity and Flow Rate Based On Piping Size

Piping Size Flow Rate [L/min] At Each Velocity [m/s]
Nominal pipe size A Nominal pipe size B Outer diameter
[mm]
Inner diameter
[mm]
0.5 1 2 3 4 5
6 1/8 10.5 7.1 1.2 2.4 4.7 7.1 9.5 11.9
8 1/4 13.8 9.4 2.1 4.2 8.3 12.5 16.6 20.8
10 3/8 17.3 12.7 3.8 7.6 15.2 22.8 30.4 38.0
15 1/2 21.7 16.1 6.1 12.2 24.4 36.6 48.8 61.0
20 3/4 27.2 21.4 10.8 21.6 43.1 64.7 86.3 108
25 1 34.0 27.2 17.4 34.8 69.7 105 139 174
32 1 1/4 42.7 35.5 29.7 59.4 119 178 237 297
40 1 1/2 48.6 41.2 40.0 79.9 160 240 320 400
50 2 60.5 52.7 65.4 131 262 392 523 654
65 2 1/2 76.3 65.9 102 205 409 614 818 1,023
80 3 89.1 78.1 144 287 575 862 1,149 1,436
90 3 1/2 101.6 90.2 192 383 766 1,150 1,533 1,916
100 4 114.3 102.3 246 493 986 1,479 1,972 2,465
125 5 139.8 126.6 377 755 1,510 2,265 3,020 3,774
150 6 165.2 151.0 537 1,074 2,148 3,222 4,296 5,370
200 8 216.3 199.9 941 1,882 3,764 5,646 7,528 9,411
250 10 267.4 248.8 1,458 2,916 5,831 8,747 11,662 14,578

*The inner diameter is a value for schedule 40 stainless steel piping. The flow rate value does not include pressure loss, etc.

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