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 bore||Max. Suction Velocity|
These values depends a lot on the fluid pumped. More about viscosity and viscosities for different fluids:
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.
Recommended max suction flow velocity when pumping boiling fluids.
Cavitation occurs in fluid flow systems where the local static pressures are below the fluids vapor pressure.
Single stage and double stage fuel oil pumps and their suction capacities.
Recommended max. suction flow velocities when pumping light oils.
Kinematic viscosities of some common liquids like motor oil, diesel fuel, peanut oil and many more.
An introduction to pumps and the Net Positive Suction Head (NPSH).
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.
Friction loss in schedule 40 steel pipe with viscous liquids - viscosities ranging from water to oil.
Vicosity is a fluid's resistance to flow and can be valued as dynamic (absolute) or kinematic.
Convert between viscosity units like Centiposes, milliPascal, CentiStokes and SSU.
Friction loss in steel pipes for fluids with viscosities ranging 32 - 80000 SSU.
Recommended max. flow velocities on delivery sides of pumps in viscous systems.
Recommended max. water flow velocities on suction sides of pumps.