1.1 本试验方法涵盖涡轮油、液压油和齿轮油分离夹带空气的能力。 注1: 本试验方法适用于烃基油。它可用于某些合成流体；然而，精度声明仅适用于烃基油。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 润滑油与设备（如轴承、联轴器、齿轮、泵和回油管路）中的空气搅动可能会在油中产生细小气泡的分散。如果储液罐中的停留时间太短，无法使气泡上升到油表面，则空气和油的混合物将在润滑油系统中循环。 这可能导致无法保持油压（尤其是离心泵），轴承和齿轮中的油膜不完整，以及液压系统性能差或故障。 5.2 本试验方法测量夹带空气含量降至相对较低值0.2的时间 % 在一组标准化试验条件下的体积，因此允许在有分离时间的条件下比较油分离夹带空气的能力。该测试方法的重要性尚未完全确定。然而，夹带的空气可能会导致泡沫和缺乏涡轮机和液压系统控制的灵敏度。 该试验可能不适合在停留时间短且气体含量高的应用中对油进行排序。

1.1 This test method covers the ability of turbine, hydraulic, and gear oils to separate entrained air. Note 1: This test method was developed for hydrocarbon based oils. It may be used for some synthetic fluids; however, the precision statement applies only to hydrocarbon based oils. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Agitation of lubricating oil with air in equipment, such as bearings, couplings, gears, pumps, and oil return lines, may produce a dispersion of finely divided air bubbles in the oil. If the residence time in the reservoir is too short to allow the air bubbles to rise to the oil surface, a mixture of air and oil will circulate through the lubricating oil system. This may result in an inability to maintain oil pressure (particularly with centrifugal pumps), incomplete oil films in bearings and gears, and poor hydraulic system performance or failure. 5.2 This test method measures the time for the entrained air content to fall to the relatively low value of 0.2 % volume under a standardized set of test conditions and hence permits the comparison of the ability of oils to separate entrained air under conditions where a separation time is available. The significance of this test method has not been fully established. However, entrained air can cause sponginess and lack of sensitivity of the control of turbine and hydraulic systems. This test may not be suitable for ranking oils in applications where residence times are short and gas contents are high.