Troubleshooting for water miscible coolants

When using water-miscible coolants, there are a number of things to consider. Even with apparently ideal application methods, problems can occur from time to time. To help you make the best possible use of your water-miscible coolants, we have prepared a chart with possible problems, causes and actions to be taken which can be used as a guide if difficulties arise.

 

ProblemPossible ReasonsPossible Action
Foam Formation1) Low coolant level in the tank
2) Pump draws air
3) Too high concentration
4) Water too soft
5) Contamination with cleaner
1) Top up coolant
2) Seal pump
3) Refill with a lower coolant concentration
4) Harden up with calcium acetate
5) Add defoamer
Instability of the Emulsion1) Mixing incorrectly
2) Contamination with fungi/bacteria
3) Temperature too high/low
4) Water too hard
1) First water, then concentrate (Oil In Last)
2) Use biocide
3) Working temperature +18°C to +35°C (65°F to 95°F)
4) Use deionized water
Smoke Formation1) Too high concentration
2) Instability of the emulsion
3) Too high foreign oil content
1) Refill with a lower coolant concentration
2) First water, then concentrate (Oil In Last)
3) Vacuum the foreign oil from the top of the tank
Fungal or Bacterial Contamination1) Contaminated water
2) Environment polluted
3) pH value too low
4) Too low concentration
5) Foreign oil content too high
6) Cross-contamination
1) Use tap water or water treatment
2) Clean gratings
3) Increase sump concentration / use biocide
4) Top up with highly concentrated emulsion
5) Vacuum the foreign oil from the top of the tank
6) Disinfect bypass devices
Corrosion1) pH value too low
2) Too low concentration
3) Water too hard
1) Increase concentration/ use biocide
2) Top up with highly concentrated emulsion
3) Use deionized water
Reduced Sump Life1) Pressure, volume
2) Too low concentration
3) Foreign oil content too high
4) Nozzles – Feeding
5) Abrasive wear
1) Open valves, remove blockage
2) Top up with highly concentrated emulsion
3) Vacuum the foreign oil from the top of the tank
4) Check alignment
5) Check filter
Deposits1) Water too hard
2) Foreign oil content too high
3) Too high concentration
4) Biological contamination
1) Use deionized water
2) Vacuum the foreign oil from the top of the tank
3) Fill with less concentrated fluid
4) Use biocide
Respiratory Problems / Skin Irritation1) pH value too high
2) Too high concentration
3) High metal abrasion
4) Dirty cleaning cloth
5) Biological contamination
6) Allergy
1) Cleaner contaminated
2) Top up with less concentrated fluid
3) Check filters
4) Use disposable cloth
5) Use biocide
6) Allergy testing by family doctor

Instability of the concentrate in drum
1) Expiration date exceeded
2) Rain contamination
3) Temperature
4) Reaction with container
1) Check storage duration in SDS
2) Correct storage (horizontal)
3) Storage temperature +5°C to +40°C (41°F to 104°F)
4) Use container without zinc or paint

 

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