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# Viscous Liquids - Max. Suction Flow Velocities

## Recommended max. pump suction flow velocity 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:

Viscous Liquids - Max. Suction Flow Velocities
Pipe boreMax. Suction Velocity
inchesmmm/sft/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 Loss in Pipes and Tubes

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• ### Piping Systems

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• ### Pumps

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## Related Documents

• ### Boiling Fluids - Max Suction Flow Velocities

Recommended max suction flow velocity when pumping boiling fluids.
• ### Cavitation

Cavitation occurs in fluid flow systems where the local static pressures are below the fluids vapor pressure.
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Single stage and double stage fuel oil pumps and their suction capacities.
• ### Light Oil Suction - Flow Velocities

Recommended max. suction flow velocities when pumping light oils.
• ### Liquids - Kinematic Viscosities

Kinematic viscosities of some common liquids like motor oil, diesel fuel, peanut oil and many more.
• ### Pumps - NPSH (Net Positive Suction Head)

An introduction to pumps and the Net Positive Suction Head (NPSH).
• ### Pumps - Suction Head vs. Altitude

The suction head of a water pump is affected by its operating altitude.
• ### Pumps - Suction Specific Speed

Suction Specific Speed can be used to determine stable and reliable operations for pumps with max efficiency without cavitation.
• ### Steel Pipes - Friction Loss vs. Viscous Liquid Flow

Friction loss in schedule 40 steel pipe with viscous liquids - viscosities ranging from water to oil.
• ### Viscosity - Absolute (Dynamic) vs. Kinematic

Vicosity is a fluid's resistance to flow and can be valued as dynamic (absolute) or kinematic.
• ### Viscosity - Converting Chart

Convert between viscosity units like Centiposes, milliPascal, CentiStokes and SSU.
• ### Viscous Liquids - Friction Loss vs. Viscosity and Flow

Friction loss in steel pipes for fluids with viscosities ranging 32 - 80000 SSU.
• ### Viscous Liquids - Max. Delivery Flow Velocities

Recommended max. flow velocities on delivery sides of pumps in viscous systems.
• ### Water - Max. Suction Flow Velocities vs. Pipe Size

Recommended max. water flow velocities on suction sides of pumps.

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## Citation

• The Engineering ToolBox (2003). Viscous Liquids - Max. Suction Flow Velocities. [online] Available at: https://www.engineeringtoolbox.com/pump-suction-flow-velocity-viscous-fluid-d_231.html [Accessed Day Month Year].

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6.3.17

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