1.1 本规程涵盖所有类型和等级的液压油。 1.2 本规程适用于实验室和现场评估。 1.3 本规程提供了进行液压油评估的指南。它没有规定具体的效率测试方法。 1.4 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.6 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 液压油的主要功能是传递动力。本规程提供了统一的指南，用于比较流体的功率传输能力，反映了其对液压系统或部件效率和生产率的影响。 5.2 提高液压系统效率的实际优势可能包括提高生产率（更快的机器循环时间）、降低功耗（电力或燃料）和减少环境影响（更低的排放）。 5.3 流体性能的差异可能相对较小。因此，在比较不同液压油配方的能效时，必须实施必要的实验控制，以确保操作条件和占空比的一致性。 5.4 这种做法意味着除了对液压系统效率的影响外，不评估液压油质量。

1.1 This practice covers all types and grades of hydraulic fluids. 1.2 This practice is applicable to both laboratory and field evaluations. 1.3 This practice provides guidelines for conducting hydraulic fluid evaluations. It does not prescribe a specific efficiency test methodology. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 The primary function of a hydraulic fluid is to transmit power. This practice provides uniform guidelines for comparing fluids in terms of their power-transmitting abilities as reflected in their effect on hydraulic system or component efficiency and productivity. 5.2 Practical advantages of enhanced hydraulic system efficiency may include increased productivity (faster machine cycle time), reduced power consumption (electricity or fuel), and reduced environmental impact (lower emissions). 5.3 Differences in fluid performance may be relatively small. Consequently, it is essential that the necessary experimental controls are implemented to ensure consistency in operating conditions and duty cycle when comparing the energy efficiency of different hydraulic fluid formulations. 5.4 This practice implies no evaluation of hydraulic fluid quality other than its effect on hydraulic system efficiency.