What is Pipe Flushing?

Pipe Flushing is a pre-commissioning activity where fluid is pumped through the piping or pipeline section with enough force to remove any construction debris, dust, rust, oil, or any other kind of impurities. Pipe flushing usually occurs with pipes that are 10 inches or less since the fluid quantity required for larger pipes is impractical.

Types of pipe flushing

Pipe flushing falls into two categories:

  • Chemical/Water flushing
  • Oil flushing

Chemical flushing is the most common method used to remove garbage elements from the piping by using plain water and water with chemicals. Oil flushing is carried out after chemical flushing to ensure that there isn’t contamination.

Flushing duration and volume

Pipe flushing is generally completed after 5 minutes of clear water begins discharging. In closed circuit loops, you can stop flushing after the pump strainer free from foreign materials and the water is clean. A sufficient volume of water should be used so that the pipe is full and exert enough force at a high enough velocity to remove foreign matters.

Pipe flushing guidelines

  • Pipe flushing should be done using normal operation flow direction
  • Pipeline flushing should be done from highest to lowest elevation
  • Flushing should be performed through fully open flanges/open pipe ends
  • The proper capacity of the pump shall be selected for pipe flushing activity
  • All required temporary fittings like a hose, blind flange, strainer, gasket, etc must be fitted before flushing
  • To avoid corrosion potential, the system should be de-watered immediately after flushing

Here at Harrison Hose and Tubing, our knowledgeable staff can help answer any questions you might have on hose, tubing, and their applications. Contact us today and learn more!

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