Lubricating oil is slightly hydroscopic. This means that at any point in time a small quantity of water is present in the oil.
It is for this reason that special precautions have to be taken when transformer oils are being introduced into the transformer. Specialized equipment is used for this process. Water can exist in lubricants in three states :
Water is a common contaminant in hydraulic and lubricating systems. Moisture can enter these systems at several points :
Lube Tip: Desiccant breathers are vital component of lubricant reliability
Desiccant breathers use filter media to remove particles greater than three microns, and a silica-gel desiccant to remove moisture from the air entering the oil. Studies have shown that 50-70% of lubricant contamination comes from outside the equipment. Most machines are designed to ‘breathe’ so protecting the source of airflow from moisture is extremely important. This is true for most sizes and types of machines.Download