Viscous Fluids - Recommended Suction Flow Velocity

Recommended suction flow velocity of viscous fluids

Avoid high velocities in the suction pipes. Higher velocities increases the pressure loss in the pipe and there may be a chance that the pump start to cavitating. As a rule of thumb the suction velocity in front of a pump should be below:

Pipe bore Viscous Liquids
inches mm m/s ft/s
1 25 0.3 1
2 50 0.33 1.1
3 75 0.36 1.2
4 100 0.4 1.3
6 150 0.43 1.4
8 200 0.45 1.5
10 250 0.5 1.7
12 300 0.5 1.7

These values depends a lot of the fluid pumped. More about viscosity and viscosities of different fluids can be read here:

Related Topics

  • Fluid Flow and Pressure Drop - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes 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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