1.1 本试验方法使用直接成像分析仪来计算和测量轻馏分和中间馏分燃料中分散固体颗粒和水滴的大小和形状，总范围为4 μm至100 μm和尺寸带 ≥ 4. μm， ≥ 6. μm，和 ≥ 14 μm。 注1: 0.7的粒度数据 μm至300 如果认为有帮助，μm可供使用或报告。 注2: 形状用于对颗粒、液滴和气泡进行分类，不属于报告要求。 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 本试验方法旨在在实验室或现场使用，以评估范围内确定的燃料的清洁度。 5.2 检测到颗粒和水可能表明燃油状况恶化。无论是无机还是有机颗粒，都可能导致燃油滤清器结垢，并损坏泵、喷油器和活塞。与冶金有关的粒度知识可以提供重要信息，特别是如果从其他来源知道固体颗粒的硬度。 注3: 该方法包括检测水、固体和气泡。在分析结果之前，根据形状和透明度从数据中筛选出气泡，结果中未报告气泡。

1.1 This test method uses a direct imaging analyzer to count and measure the size and shape of dispersed solid particles and water droplets in light and middle distillate fuels in the overall range from 4 μm to 100 μm and in size bands of ≥ 4 μm, ≥ 6 μm, and ≥ 14 μm. Note 1: Particle size data from 0.7 μm through 300 μm is available for use or reporting if deemed helpful. Note 2: Shape is used to classify particles, droplets, and bubbles and is not a reporting requirement. 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 This test method is intended for use in the laboratory or in the field for evaluating the cleanliness of fuels identified in the scope. 5.2 Detection of particles and water can indicate degradation of the fuel condition. Particles, whether inorganic or organic, can cause fouling of fuel filters and damage pumps, injectors, and pistons. Knowledge of particle size in relation to metallurgy can provide vital information, especially if the hardness of the solid particles are known from other sources. Note 3: The method includes the detection of water, solids, and air bubbles. The air bubbles are screened out of the data prior to analysis of results, based on shape and transparency, and are not reported in the results.