1.1 本试验方法包括两个程序，用于估算蒸馏终点低于400的馏分燃料中存在的悬浮游离水和固体颗粒污染 °C，ASTM颜色为5或以下。 1.1.1 这两种程序均可用于储存温度下的现场试验，或在受控温度下的实验室试验。 1.1.2 程序1为污染提供了快速通过/失败方法。程序2提供了烟雾外观的总数值评级。 1.2 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。 1.3 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。 1.4 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 长期以来，在燃油规格中包括要求燃油 清澈明亮，无可见颗粒物 （请参见 注释1 ). 然而，目前还没有标准的方法来进行这一测定，因此实践有所不同。本试验方法提供了试验的标准程序。 注1: 干净明亮 有时用来代替 清晰明亮。 意思是一样的。 5.2 程序1提供了馏分燃料污染的快速通过/失败方法。程序2提供了烟雾外观的总数值评级，主要用作通信工具。 其他试验方法，包括试验方法 2276美元 , 第2709页 和 D4860天 ，允许对污染物进行定量测定。程序2和这些定量方法之间没有建立任何关系。 5.2.1 测试方法 D8148电话 通过根据光谱测定的雾霾清晰度指数（HCI）报告相关仪器雾霾等级（IHR），建立了与程序2外观等级编号的相关关系。支持数据见RR:D02-1876。 5. 5.3 实验室对未通过测试的样品的评估有限 清晰明亮 测试表明，经验丰富的测试仪可以检测到燃油中的游离水含量仅为40ppm。

1.1 This test method covers two procedures for estimating the presence of suspended free water and solid particulate contamination in distillate fuels having distillation end points below 400 °C and an ASTM color of 5 or less. 1.1.1 Both procedures can be used as field tests at storage temperatures, or as laboratory tests at controlled temperatures. 1.1.2 Procedure 1 provides a rapid pass/fail method for contamination. Procedure 2 provides a gross numerical rating of haze appearance. 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 It has long been the practice to include in fuel specifications a requirement that the fuel be clear and bright and free of visible particulate matter (see Note 1 ). However, there has been no standard method for making this determination so that practices have differed. This test method provides standard procedures for the test. Note 1: Clean and bright is sometimes used in place of clear and bright. The meaning is identical. 5.2 Procedure 1 provides a rapid pass/fail method for contamination in a distillate fuel. Procedure 2 provides a gross numerical rating of haze appearance, primarily as a communication tool. Other test methods, including Test Methods D2276 , D2709 , and D4860 , permit quantitative determinations of contaminants. No relationship has been established between Procedure 2 and these quantitative methods. 5.2.1 Test Method D8148 has established a correlating relationship with Procedure 2 appearance rating numbers by reporting a correlating instrument haze rating (IHR) based upon its spectroscopically determined haze clarity index (HCI). Supporting data can be found in RR:D02-1876. 5 5.3 Limited laboratory evaluations of samples that have failed this clear and bright test indicate that an experienced tester can detect as little as 40 ppm of free water in the fuel.