1.1 本试验方法包括测定粘度在1.0范围内的中间馏分燃料中悬浮在散装燃料中的自由水和沉积物的体积（以样品的百分比表示） 嗯 2. /s至4.1 嗯 2. /她40岁了 摄氏度（1.0 cSt至4.1 cSt在104 °F）和770范围内的密度 kg/m 3. 至900 kg/m 3. 15岁 摄氏度。 注1: 符合规范的燃料 D396 等级1和2， D975 等级1-D和2-D，规范 D2880 等级0-GT、1-GT和2-GT以及规格 D3699 1-K和2-K级以及类似的中间馏分燃料和混合料通常会落入该粘度和密度范围。测试方法 D1796 适用于高粘度燃油。 1.2 以国际单位制表示的数值应视为标准值。 1.2.1 例外- 非SI值仅供参考。 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）。 本标准的用户有责任在使用前建立适当的安全、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 本试验方法用于指示中间馏分燃料（如1号和2号燃料油）中悬浮的自由水和沉积物的雾度、浊度或液滴（规范 D396 )1-D和2-D级柴油（规范 D975 )以及0-GT、1-GT和2-GT级燃气轮机燃料（规范 D2880 )，类似的燃料和用于制造这些燃料的混合料。 5.2 燃料油中大量的自由水和沉淀物往往会导致燃料处理设施的污染，并在燃烧器或发动机的燃料系统中造成故障。储罐和滤网上的沉积物堆积会阻碍油从储罐流向燃烧器。中间馏分燃料中的游离水会导致储罐和设备腐蚀，如果存在洗涤剂，水会导致乳化或模糊外观。自由水可以支持燃料系统中燃料-水界面处的微生物生长。 (一) 当处于旋转位置时，在相对管的尖端之间测量。 (二) “r/min”是前一术语“rpm”的正确SI符号

1.1 This test method covers the determination of the volume of free water and sediment (as a percentage of the sample) that is suspended in the bulk fuel in middle distillate fuels with viscosities in the range of 1.0 mm 2 /s to 4.1 mm 2 /s at 40 °C (1.0 cSt to 4.1 cSt at 104 °F) and densities in the range of 770 kg/m 3 to 900 kg/m 3 at 15 °C. Note 1: Fuels corresponding to Specification D396 Grades No. 1 and 2, D975 Grades No. 1-D and 2-D, Specification D2880 Grades No. 0-GT, 1-GT and 2-GT, and Specification D3699 Grades No. 1-K and 2-K and similar middle distillate fuels and blendstocks will usually fall in this viscosity and density range. Test Method D1796 is intended for higher viscosity fuel oils. 1.2 The values stated in SI units are to be regarded as standard. 1.2.1 Exception— The non-SI values are for information only. 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 used as an indication of free water and sediment suspended as haze, cloudiness, or droplets in middle distillate fuels such as Grades No. 1 and 2 fuel oil (Specification D396 ), Grades No. 1-D and 2-D diesel fuel (Specification D975 ), and Grades No. 0-GT, 1-GT, and 2-GT gas turbine fuels (Specification D2880 ), similar fuels and blendstocks used to make these fuels. 5.2 Appreciable amounts of free water and sediment in a fuel oil tend to cause fouling of fuel-handling facilities and to give trouble in the fuel system of a burner or engine. An accumulation of sediment in storage tanks and on filter screens can obstruct the flow of oil from the tank to the combustor. Free water in middle distillate fuels can cause corrosion of tanks and equipment, and if detergent is present, the water can cause emulsions or a hazy appearance. Free water can support microbiological growth at fuel-water interfaces in fuel systems. (A) Measured between tips of opposite tubes when in rotating position. (B) “r/min” is the correct SI symbol for the former term “rpm.”