2014.11.30 Bacteria and endotoxines, Maintenance

7 steps for better metalworking fluid maintenance

Maintenance of the process fluid is complex, and each system has its own requirements. We have listed the seven most important points to consider.

1. Cleaning

Cleaning is an important factor in avoiding bacteria. Some machines are very difficult to clean and in other cases there may be equipment in the road that is broken or not used - remove it to make it easier to maintain.

Cleaning the chip conveyor is important to make the fluid pass. This can be difficult, but it is very important that the cutting fluid should have a good function and a long service life.

At the cutting-edge break, or at least once a year, it is advisable to use high-pressure coil pipelines to eliminate flakes and coatings.

2. Concentration of metalworking fluid

The metalworking fluid's concentration is crucial for its function and its service life as the right concentration produces the best relationship between the different components in the metalworking fluid. Measure via a refractometer value, TA content or total amount of oil or the methods in comb.

3. A stable pH

A stable pH produces:

  • Reduced bacterial growth
  • Retained rust protection
  • Uniform oil droplet size

4. A stable temperature

Large temperature differences can produce tolerance problems in the production process. Each degree that the temperature rises increases the bacteria's rate of growth at the same time as the water evaporates faster. The temperature should be between 18 and 20˚C in an average system.

5. Take samples

Good maintenance requires continuous sampling, both internally and externally. The need to take samples varies from system to system, from three times a day to once a year.

We recommend measuring the concentration internally every 24 hours and then performing a bacterial analysis at least once a week. Remember to document all samples and measures!

6. Aerate and ensure it is free of tramp oil

To avoid growth of the worst bacteria the fluid must be aerated. For smaller systems it can be performed simply with a small aquarium pump.

Tramp oil is fertilizer for bacteria, and can also prevent aeration as it lies like a tight "lid" over the surface of the fluid. Separate the tramp oil with a skimmer, paper tape filter or other separator.

7. Check the filter

An indication that the paper in the paper filter is correct and is properly tied are the white edges. Never feed the paper manually, but leave it alone and do the job.


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Hans Ahlgren
Hans Ahlgren

Hans introducerade processvätskerening inom Wallenius Water 2011 efter ett flertal lyckade fältinstallationer. Processvätskerening är idag ett av Wallenius Waters fokusområden. I dag arbetar Hans med strategisk partnerutveckling inom affärsområdet.

+46 8 120 138 37
Hans introduced process fluid purification within Wallenius Water in 2011 after several successful field installations. Today purification of process fluid is one of Wallenius Water's focus areas.

+46 8 120 138 37
Hans führte die Reinigung von Prozessflüssigkeit innerhalb Wallenius Water im Jahr 2011, nach mehreren erfolgreichen Feldinstallationen, ein. Heute ist die Reinigung von Prozessflüssigkeit eine der Schwerunkte von Wallenius Water.

+46 8 120 138 37


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