Bladders allow air movement in and out of headspace without exchange of air to environment.

No new atmosphere dirt or moisture is permitted to enter headspace or oil.

A possible disadvantage is the inability to purge original moisture out of the headspace which prevents the normal thermal dehydration of the oil by evaporation and convection.

Best application is where frequent oil level changes occur, such as hydraulic systems.

Every day, maintenance personnel in plants across North America fill or top-off systems with new lubricants. Their intention is to positively impact the life and performance of the equipment. Yet unknowingly, they often add mixed, chemically depleted lubricants containing particulate, chemical and moisture contamination. Poor in-plant storage often lies at the root of these occurrences. Just like bearings, gears or valves, lubricants should be considered working components in mechanical systems.

Just as one would not install a dirty or damaged bearing on a piece of equipment using the wrong tools, "damaged" lubricants should not be added to the machine. The first step toward achieving proactive maintenance of your lubricants, and ultimately your equipment, begins with proper in-plant storage and handling. Read the entire article.

Field studies show that particle ingression rates can exceed 100 million particles per minute in outdoor mobile hydraulic applications.