Capacity problems, cavitation and higher power consumption in pumps, are often the result of conditions on the suction sides of the pumps.
In general - as a rule of thumb - for light oils, keep the suction fluid flow speed below the following values:
|Pipe bore||Light Oil Velocity|
More about NPSH suction problems can be read here:
- Cavitation and NPSH - an introduction to cavitation and Net Positive Suction Head NPSH
Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.
Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams.
Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more.
Cavitation occurs in fluid flow systems where the local static pressures are below the fluids vapor pressure.
Viscosities and densities of ISO - and equivalent SAE grade oils.
Recommended max. flow velocities on the delivery side when pumping light oils.
Specific heats for some common liquids and fluids - acetone, oil, paraffin, water and many more.
Dynamic viscosities for motor oils SAE 10 to 50 for temperatures ranging 0-100 oC.
Oil pipes flow velocities should be kept within certain limits.
Convert between commonly used oil viscosity units.
The suction head of a water pump is affected by its operating altitude.
Suction Specific Speed can be used to determine stable and reliable operations for pumps with max efficiency without cavitation.
Recommended max. flow velocities on delivery sides of pumps in viscous systems.
Recommended max. pump suction flow velocity for viscous fluids.
Recommended max. water flow velocities on suction sides of pumps.
Recommended maximum flow velocities in water systems on the delivery side of the pump.