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Slurry Transport - Minimum Flow Velocity

Avoid settling of solids in slurry transport systems with flow velocities above certain levels

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Pipeline slurry transport

A suspension of solid particles in a liquid, as in a mixture of cement, clay, coal dust, manure, meat, etc. - with water is often called a slurry.

In transport systems for slurries it's important to avoid settling of solids by keeping the fluid velocities in the pipe lines above certain levels. The levels depends primary on the type and size of the solid in the slurry:

Type of SolidsSize of Solids
(Mesh No)
Minimum Flow Velocity
Fine over 200 1 – 1.5 3 – 5
Sand 200 – 20 1.5 – 2 5 – 7
Coarse 20 – 4 2 – 3.25 7 – 11
Sludge 3.25 – 4.25 11 – 14

Particle Sizes

A pipeline transport system may under certain circumstances be nearly self cleaning. When a solid settle the pipe area decrease - and fluid speed increase - until a state of equilibrium where the speed is so high that settling is avoided.

The speed should be increased in lifting lines by decreasing the piping diameter. At the end of a pipeline the speed should be slowed down by increasing the pipeline diameter.

Mesh definition

  • Mesh is the number of openings per inch of a screen - "a 100 mesh screen"
  • Mesh is often used to measures the size of particles - "100 mesh powdered sand"
  • Sieve size and mesh designation

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Related Topics

Related Documents

Tag Search

  • en: Fluids suspension solids velocity slurry slurries
  • es: Fluidos suspensiones de sólidos en suspensión de lodos velocidad
  • de: Flüssigkeiten Federung Feststoffgeschwindigkeit Gülle Schlämmen
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  • Engineering ToolBox, (2003). Slurry Transport - Minimum Flow Velocity. [online] Available at: [Accessed Day Mo. Year].

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