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Best Practices for Maintaining Coolant Quality

August 01, 2012
Jean Van Rensselar
Tip or Best Practice


Best Practices For Maintaining Coolant Quality*

Excerpt from TLT's Feature Article in August 2012, The Growth of Biobased Metalworking Fluids by Jean Van Rensselar. Read the rest of the article here when it's available.

Coolants need to be filtered and recycled regularly and the equipment completely cleaned at least annually. Assuming that workers are continuously removing metal chips and tramp oil, the Ohio EPA recommends the following coolant system cleaning practices for maintaining optimal fluid quality:

  • Remove the coolant.
  • Remove all metal chips and fines.
  • Clean any oily residues that remain on any surface. 
  • Fill the sump with a good cleaner using clean water and circulate the cleaner through the coolant system for several hours.
  • Apply cleaning solution to the machine surfaces that are not contacted by the coolant during machine operation.
  • Pump cleaning solution from the sump. 
  • Wipe cleaning solution residues from the sump. 
  • Rinse the entire coolant system with clean water. Wipe off cleaned surfaces that are not contacted by the rinse water cycling through the system. Rinse the system again if necessary to remove all residues.
  • Recharge the system with reclaimed or new coolant immediately to protect metal surfaces against corrosion.

*From http://www.epa.ohio.gov/ocapp/p2/fact11.aspx.

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