Water - Suction Flow Velocities

Recommended water flow velocities on suction sides of pumps

Capacity problems, cavitation and high power consumption in pumps, are often results of the conditions on the suction side.

In general - as a rule of thumb - keep the suction fluid flow speed below the following values:

Pipe boreWater
inches mm m/s ft/s
1 25 0.5 1.5
2 50 0.5 1.6
3 75 0.5 1.7
4 100 0.55 1.8
6 150 0.6 2
8 200 0.75 2.5
10 250 0.9 3
12 300 1.4 4.5

More about NPSH and suction problems:

Related Topics

  • Fluid Flow and Pressure Drop - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more
  • Water Systems - Hot and cold water systems - design properties, capacities, sizing and more
  • Piping Systems - Dimensions of pipes and tubes - dimensions, materials, capacities - pressure drop calculations and charts - insulation and heat loss diagrams
  • Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

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