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Saturday, January 14, 2017

High fluid temperature and its consequencesin Hydraulic System



Case study
High fluid temperature and its consequences


An inspection of two axial piston motors that had failed well short of their expected service life revealed that the motors had failed through inadequate lubrication, as a result of low fluid viscosity caused by excessive fluid temperature.


How does this happen?
As the temperature of petroleum-based hydraulic fluid increases, its viscosity decreases. If fluid temperature increases to the point where viscosity falls below the level required to maintain a lubricating film between the internal parts of the component, damage will result.
The temperature at which this occurs depends on the viscosity grade of the fluid in the system. Hydraulic fluid temperatures above 82°C damage seals and reduce the service life of the fluid. But depending on the grade of fluid, viscosity can fall to critical levels well below this temperature.

How can this type of failure be prevented?
The above example highlights the importance of not allowing fluid temperature to exceed the point at which viscosity falls below the optimum level for the system's components.
Continuing to operate a hydraulic system when the fluid is over-temperature is similar to operating an internal-combustion engine with high coolant temperature. Damage is pretty much guaranteed.
Therefore, whenever a hydraulic system starts to overheat, shut down the system, find the cause of the problem and fix it!

Warm up the cold hydraulic fluid to a temperature with in operating range in cold climate before putting the hydraulic machinery on load.

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