Steel Pipes - Maximum Water Flow Capacities

Maximum water flow capacities in steel pipes - pipe dimensions ranging 2 - 24 inches

No single recommendation will be correct for all possible circumstances, but the table below can be used as a general guidance for water flow capacities in Steel pipes schedule 40.

Pipe Size
(inch)
Maximum Flow
(gal/min)
Velocity
(ft/s)
Head Loss
(ft/100ft)
2 45 4.3 3.9
2 1/2 75 5.0 4.1
3 130 5.6 3.9
4 260 6.6 4.0
6 800 8.9 4.0
8 1600 10.3 3.8
10 3000 12.2 4.0
12 4700 13.4 4.0
14 6000 14.2 4.0
16 8000 14.5 3.5
18 10000 14.3 3.0
20 12000 13.8 2.4
24 18000 14.4 2.1

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