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Dynamic Demulsibility Endurance Test Background: Clark Labs is the premiere lab for super dynamic demulsibility testing. Rapid separation of water contamination in lubricating oil is an important system characteristic. Development of lubricant technology has advanced oil blends to separate water quickly and at lower temperatures. This allows for new bearing system design such as elimination of traditional resting tanks. However, at issue is the need for a laboratory test method, which allows the oil demulsibility characteristics to be more realistically evaluated than allowed by the traditional ASTM D1401/ ISO 6614 and ASTM D 2711, which are static tests. These tests can be used as screening test because if the oil fails one of these static tests, it will fail the DDE test. The Dynamic Demulsibility Endurance Test (DDE) measures the ability of circulating oil to separate water under accelerated and simulated lubrication system circulating conditions. The test offers controlled and standardized conditions for repeatable evaluation of sample oils. Procedure: Oil and distilled water are mixed in a reservoir. When the temperature is stable, water is introduced at a specified rate of oil flow and stirred into the oil flow via a paddle stirrer. The oil continuously circulates through the test equipment while receiving and demulsifying water. After several hours the amount of water entrained in the oil at the top of the reservoir is measured. The amount of water contaminating the oil is reported as percent of water to the nearest one tenth. Oils are considered "super" demulsifying when they produce 10 or less percent water in oil and trace or better amounts of oil in water. Test temperature, residence time, additional water rate and type water (hard or mill) are adjustable and may be varied by the operator. Morgan Bearing Division of Morgan Construction Company requires the following limits in its Advanced Lubricant specification: Max % water in oil after centrifuging for ISO VG 100-460 = 10%, for ISO VG 680 = 12% Max % oil in water after centrifuging for ISO VG 100-460 = 1%, for ISO VG 680 = 1% |
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