1.1 本规范涵盖蒸汽和燃气轮机润滑系统中使用的矿物油和合成油（API第I、II、III或IV组），性能要求要求高度精炼的矿物油或合成基础油与防锈剂和氧化抑制剂以及控制泡沫、磨损、抗乳化性等所需的选定添加剂混合。本标准也可适用于“联合循环”涡轮系统，其中使用单个润滑剂循环系统向串联配置在单个或单独轴上的蒸汽和燃气轮机供油，以提高能效。 1.2 本规范旨在定义矿物油和合成油的性质- 在功能上可与现有的此类润滑油互换、与大多数现有机械部件兼容并进行适当的现场维护的基础涡轮润滑油将保持其功能特性。 1.3 本规范仅用于在将新润滑油安装到机器中之前对其进行定义。 1.4 本规范旨在用作指南。不符合本规范的油可能在某些涡轮机中表现令人满意。 1.5 本规范不包括API第V组流体。对于用于润滑陆上燃气轮机的多元醇酯流体，用户可参考军用规范MIL的当前版本- PRF-23699用于流体性能要求。对于用作汽轮机润滑剂或汽轮机电液控制（EHC）流体的磷酸酯流体，用户可参考当前版本的规范 D4293型 以满足流体性能要求。 1.6 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.7 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers mineral and synthetic (API group I, II, III, or IV) oils used in steam and gas turbine lubrication systems where the performance requirements demand highly refined mineral or synthetic base oils compounded with rust and oxidation inhibitors plus selected additives as needed to control foam, wear, demulsibility, and so forth. This standard may also be applied to “combined cycle” turbine systems, where a single lubricant circulating system is used to supply oil to a steam and gas turbine configured in tandem either on a single or separate shaft for enhanced energy efficiency. 1.2 This specification is intended to define the properties of mineral and synthetic oil-based turbine lubricating oils that are functionally interchangeable with existing oils of this type, are compatible with most existing machinery components, and with appropriate field maintenance, will maintain their functional characteristics. 1.3 This specification is intended to define only new lubricating oil before it is installed in the machinery. 1.4 This specification is intended to be used as a guide. It is possible that oils that do not meet this specification may perform satisfactorily in some turbines. 1.5 This specification does not include API Group V fluids. For polyol ester fluids used to lubricate land-based gas turbines, the user is referred to the current version of military specification MIL-PRF-23699 for fluid performance requirements. For phosphate ester fluids used as turbine lubricants or steam turbine electro-hydraulic control (EHC) fluids, the user is referred to the current version of Specification D4293 for fluid performance requirements. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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.