Hydraulic oil flushing

From our industrial technical cleaning department we offer you the best service so that hydraulic oil flushing is optimal for the proper functioning of your machines, which is why we fear 100% reliability in our work.

Limpiezas técnicas industriales has professionals who have a continuous training to keep moving forward with new technologies.

LTI Catalogue

Flushing Catalogue

Information on hydraulic flushing:


The HYDRAULIC OIL FLUSHING procedure consists of circulating new or used oil (by dialysing and filtering it beforehand) through the system’s circuits and equipment. It is carried out in: Lubrication, thermal oil (HTF) and hydraulic circuits.

If necessary, accessories disconnected from the equipment must be cleaned separately and with more specific systems for each component. Of course, all consumable equipment and boilers are “bridged”, i.e. the equipment must be modified by welding additional pipes, plugs, coils, etc. -unless flushing is foreseen during construction- until a circuit is achieved where the high velocity does not cause damage or danger to any of the equipment components.

This change in circuit flow usually results in a reduction of the pressure drop in the circuit, which allows the installed circulating pump to provide a higher flow – and higher consumption – and a higher speed. This allows the pump to be used for “flushing” in some cases. In most cases, a special pump – a positive displacement pump, usually gear driven – is used to deliver the calculated flow rate.

The ideal temperature of the thermal flushing fluid is about 50 °C. However, flushing does not necessarily have to be carried out at room temperature, as heating of the fluid can sometimes be problematic. Of course, it is important to avoid temperatures that can evaporate moisture from the system.

To trap and remove the dirt that escapes from the pipes, a filter must be installed, the size of which must be chosen with special care.

There can be one or more filters, allowing the filter size to vary from an initial filter of 25 microns or more, where the larger particles are retained, to a final filter of between 1 and 5 microns, which retains the smaller particles and is placed at the final stage of the process.

Depending on the size of the filter and the type of installation, washing can be done in two or three stages, each with a different filter size. It is advisable to use a double filter, which allows the filters to be changed during operation, and to have a differential pressure gauge before and after the filter to detect if the filter starts to clog due to accumulated dirt.

The time required for recirculation varies widely and depends on the system to be cleaned and the estimated level of contamination. Generally, the initial recirculation time is allowed to elapse, but then the process is carried out until the last filter appears completely clean and free of residual contaminants.

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