Reynolds Number calculator for hydraulic systems

If you are designing a hydraulic system use our handy hydraulic flushing formula calculator, a helpful tool at your disposal.

Welcome to our Reynolds Number hydraulic calculator designed for Flushing Formulae. Flushing plays a crucial role in removing dirt and impurities introduced during system manufacturing, assembly, initial operation, or significant maintenance. To ensure an efficient flushing process, the system must establish a turbulent flow regime that picks up particles from component walls and transports them to a flushing filter. 

Reynolds Number

Reynolds Number Flushing Formulae

Flushing is a process designed to remove dirt introduced into the system during manufacture, assembly and initial operation. It is also used when significant maintenance is undertaken. The requirements are summarised below:

  • A turbulent flow regime to pick-up the particles from the walls of components and transport them to the flushing filter.
  • The Reynolds number (Re) defines the flow condition and should be greater than 4,000.
  • Or, to achieve Re >= 4,000 Q > 0.189 x v x d
  • A ‘fine’ filter to capture transported particles quickly and effectively


Every precaution has been made to make sure the above calculator is accurate. However, we cannot guarantee the calculations you make are appropriate for your applications and online calculations could produce erroneous figures. If you do see figures that you are unsure about, please don't hesitate to contact us.

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