Steel Pipes - Maximum Water Flow Capacities

Maximum water flow capacity of steel pipes - dimensions ranging 2 - 24 inches

Unfortunately no single recommendation will be correct for all possible circumstances, but the table below can be used as a general guidance for the water flow capacity 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 1,600 10.3 3.8
10 3,000 12.2 4.0
12 4,700 13.4 4.0
14 6,000 14.2 4.0
16 8,000 14.5 3.5
18 10,000 14.3 3.0
20 12,000 13.8 2.4
24 18,000 14.4 2.1

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