1.1 本指南提供了实现EHC系统安全可靠运行的建议、所需纠正措施的建议级别以及建议的管理实践。 1.2 磷酸三芳基酯的推荐物理和化学性质及其限度是根据过去在不同操作和环境条件下不同EHC系统设计中使用的各种流体（主要是二甲苯基和丁基磷酸三芳酯）的操作经验选择的。 1.3 本指南并非旨在取代原始设备制造商（OEM）的规范，而是根据磷酸三芳基酯降解机制的现有知识，通过建议限值来支持遇到操作问题的用户。本指南应在保修期之外使用，或者在没有OEM标准的情况下使用。 1.4 以国际单位制表示的数值应视为标准。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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 本指南概述了监视中性能的要求- 提供基于三芳基磷酸酯的耐火流体，以实现涡轮机电液控制系统的安全可靠运行。

1.1 This guide provides recommendations to achieve safe and reliable operation of EHC systems, recommended levels for required corrective action, and suggested management practices. 1.2 The recommended set of physical and chemical properties of triaryl phosphate esters and their limits have been selected based on past operating experience with various fluids (primarily xylylated and butylated triaryl phosphate esters) used in different EHC system designs under different operating and environmental conditions. 1.3 This guide is not intended to replace Original Equipment Manufacturer (OEM) specifications but rather support users experiencing operating problems by recommending limits based on existing knowledge of triaryl phosphate ester degradation mechanisms. This guide should be used outside the warranty period or in cases where no OEM standard exists or is available. 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 ====== 4.1 This guide outlines the requirements for monitoring the performance of in-service fire-resistant fluids based on triaryl phosphate esters to accomplish safe and reliable operation of turbine electro-hydraulic control systems.