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Entrained Gases Table of Contents Physical & Chemical Properties If the amount of a gas in oil exceeds saturation, small bubbles will form, remain suspended, and the oil will appear hazy. This is called entrained gas. The bubbles slowly rise to the surface. Bubbles of a gas, such as air, in an oil film cause holes that reduce oil film continuity and decrease the film's ability to prevent solid-to-solid contact. The relative tendency of various oils to release entrained gas is measured by a gas bubble separation method ASTM D 3427. The method uses a cylinder-like test vessel with gas inlet and outlet ports. Air, or another gas (if of interest), is introduced into the bottom of the vessel at a specified temperature and flow rate. At the end of seven minutes the gas flow is stopped and the change in density as measured by a densitometer is recorded. The test is complete when the total volume of entrained air is reduced to 0.20% by volume. The results are reported as the time it took for the oil to attain this value. For more information call 1-888-HERGUTH (437-4884) | |||||||||||||||||||
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