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Water Flow - Max. Delivery Velocities vs. Pipe Size

Recommended maximum flow velocities in water systems on the delivery side of the pump.

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As a rule of thumb the following velocities can be used in design of piping and pumping systems for water:

Water Flow - Max. Delivery Velocities
NPSMax. Delivery Velocity
inchesmmm/sft/s
1 25 1 3.5
2 50 1.1 3.6
3 75 1.15 3.8
4 100 1.25 4
6 150 1.5 4.7
8 200 1.75 5.5
10 250 2 6.5
12 300 2.65 8.5

More about Water Systems, Pumps or Piping Systems.

Water pipes - maximum recommended flow velocity

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