Refilling of the machining coolant system

Changing the machining oil in the system

If there is a machining oil in the system that is in good condition, the new fluid can be added to the old one. Before adding the new machining fluid, a test of the mixability of the new product with the old one should be carried out in the laboratory to ensure that there are no foaming or precipitate problems when mixing the two products.

Mixing ratios between the products being tested should be 10/90, 50/50 and 90/10. This simulates the start of dilution when there is 10% new product and 90% old product in the system, when there is 50% old and 50% new product in the process, and the point at which there is 90% new product and 10% old product in the system while fluid replacement is almost complete. If there are problems, they are usually detected at the 10/90 or 90/10 stage. If the laboratory test results are good, the oil change usually goes quite smoothly.

Changing the water-based machining coolant (emulsion)

Total system coolant replacment

When replacing the entire volume of coolant in a system, it is always best to start by applying a cleaning agent with disinfectant properties before draining the system.
Then remove all fittings, pressure wash all pipes and mechanically clean all corners and nooks of the system.

If the tank and pipes are not cleaned properly, there is a high risk of dirt and residue from the old coolant getting into the fresh coolant during filling, especially if the new coolant has better cleaning properties, which can result in clogged filters and possible leakage.

Initially, when the whole system is replaced and started with the new product, prepared in soft water, there is a greater risk of foaming. This problem subsides over time.

Partial replacement of coolant in the system

In this process, a certain amount of the old fluid is removed and replaced with new fluid in the manner of adding fresh product to the system. There is a risk of precipitation of some of the previously formed deposits, but this is significantly less than with option 1 if all tanks and pipes were not properly cleaned.

Gradual addition of fresh coolant

The gradual addition of new or fresh coolant can gradually increase the cleaning properties and make it easier for the filters to cope with small amounts of deposits. With this option, switching to a new product causes fewer problems and ensures fewer operational disruptions. It is additionally important to check for mixability.