In the past general practice has been to recommend a minimum slurry line velocity of 4 ft/s (1.2 m/s) for lime slurry piping with a diameter of 3” or larger. This velocity was thought to be sufficient to maintain turbulent flow and prevent settling.
Current practice recommends a minimum slurry line velocity of 8 ft/s for lime slurry piping with a diameter of 3” or larger.
For 2” lime slurry piping we recommend a minimum of 8 - 10 ft/s (2.4 - 3.1 m/s).
Line velocity above 10 ft/s (above 3.1 m/s) is excessive and may lead to increased pipe wear and inefficient pumping.