Slurry Transport - Minimum Flow Velocity

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

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
m/sft/s
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

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

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, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams

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

Search the Engineering ToolBox

- "the most efficient way to navigate!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

close