DESIGN NOTES
Ken Korane • Contributing Editor
The filters come in many versions to suit wide-ranging applications and can be retrofitted without the need to modify the hydraulic system.
Adsorber filters protect against harmful condensation Water in the oil is a serious issue for many hydraulic systems, because it can lead to increased wear and leakage. Adsorber filters which prevent moisture ingress via the tank breather system provide a remedy, according to engineers at HansaFlex, Bremen, Germany. Unfortunately, although these filters can prevent serious damage and high costs, few systems are equipped with them. Operators often mistakenly assume that they don’t need protection against condensation, explained company officials. The fact is, if there is too much water in hydraulic oil, the system is subjected to a number of negative factors: condensation in the oil tank leads to premature aging, for example through hydrolysis. In addition, water attacks metallic surfaces and releases particles 18
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that can damage hoses and other components. Seals can also swell or shrink on contact with water and, in turn, permit leaks. Shorter maintenance intervals, high repair requirements and longer downtimes are the result. Water can enter a hydraulic system in various ways. New oil, for example, may have a higher-than-recommended water content. Moisture can also enter the system through the rod seals of a cylinder. But what many people don’t realize is that the most common entry point
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10/16/19 9:09 AM
