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Reliability Articles

Have You Controlled And Monitored Varnish On Your Hydraulic Oil…?

There is a lot of demand for hydraulic oil. Hydraulic Oil is used to transmit energy, lubricate components, transfer heat, and carry contaminants off critical surfaces. They often have to do their job in very dirty environments while withstanding significant thermal stresses. Contaminated hydraulic oil accounts for the majority of hydraulic system failures. However, another significant failure mode in hydraulic oil occurs when it degrades, resulting in varnish deposits.

Varnish is an oil-derived deposit. It produces a sticky, ductile residue that damages reliable hydraulic system performance. Varnish can cause valves to stick, risking system control. This acts as an insulator, preventing the oil from performing its cooling function, resulting in a hotter and less efficient system.

Varnish can stain the filter, requiring frequent changes. These deposits can also build up, clogging oil lines or heat exchangers. Oil is difficult to function if it cannot reach its intended destinations.

Practically, oil degradation and varnish deposit formation are not measured by most state monitoring programs.

The main reason why hydraulic oil users are unable to detect a varnish problem with their fluids is due to insufficient oil analysis testing.

Hydraulic oil formulations are constantly being updated to accommodate these more stressful environments; However, the varnish problem remains.

“The more varnish that is produced in the machine, the worse the result and the harder it is to act on it. Important parts of the machine can be affected. ”

Various kinds of hydraulic oil tests were carried out in order to be able to detect and measure the indications of this varnish. Tiara provides a solution in providing this hydraulic oil test so that Tiara can provide recommendations on oil management in order to reduce the risk of failure in your hydraulic system.

The attached article shows references to the success of hydraulic oil testing and development in measuring and managing hydraulic oil degradation.









Download the white paper for more information:

1.       Article: Combating oil Varnish with standard testing at Hastings Deering.

2.       Article: Developments in Measuring and Managing Hydraulic Oil Degradation.

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