Viscous Fluids - Recommended Suction Flow Velocities

Recommended pump suction flow velocities for viscous fluids

Avoid higher velocities in suction pipes. Higher velocities increases pressure loss in pipes and the pumps may start to cavitate. For viscous liquids - as a rule of thumb - the suction velocities in front of pumps should be below:

Pipe boreViscous 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 on the fluid pumped. More about viscosity and viscosities for different fluids:

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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