1.1 本试验方法包括测定中间馏分燃料油和液体燃料（如生物柴油和生物柴油混合物）的过滤器堵塞趋势（FBT）和可过滤性的三个程序。这三个步骤和相关的过滤器类型适用于粘度范围为1.3的燃油 毫米 2. 至6.0 毫米 2. /s在40 °C。 注1: 本试验方法范围内的ASTM规范燃料为:规范 D396 1级和2级；规格 D975 1-D级、低硫1-D级和2-D级；规格 D2880 1-GT级和2-GT级；规格 D6751 . 1.2 本试验方法不适用于含有游离（未溶解）水的燃料（见 7.3 ). 1.3 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。 1.4 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。 1.5 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====== 5.1 本试验方法用于评估中间馏分燃料、生物柴油和生物柴油混合物的清洁度，以达到规范和质量控制的目的。 5.2 三个程序中规定的过滤介质均适用于范围内的材料。调用此测试方法的规范应说明所需的程序。 5.3 储存或预处理后过滤性能的变化可以指示燃料条件的变化。 5.4 燃料的可过滤性取决于过滤器的孔隙率和结构，因此该试验方法的结果可能与完全相关- 水垢过滤。 5.5 工业/炼油厂过滤器过滤能力差的原因包括燃料降解产物、储存或转移过程中收集的污染物（包括水）、生物燃料的温度或成分造成的影响、混合燃料的不相容性或燃料与过滤介质的相互作用。其中任何一种都可能与孔口或过滤系统堵塞有关，或两者兼有。 5.6 FBT测试的结果范围从过滤性非常好的燃料的1到过滤性较差的燃料的100以上。不可能选择单个FBT编号来定义合格或不合格标准，因为这将取决于燃料类型和应用。

1.1 This test method covers three procedures for the determination of the filter blocking tendency (FBT) and filterability of middle distillate fuel oils and liquid fuels such as biodiesel and biodiesel blends. The three procedures and associated filter types are applicable to fuels within the viscosity range of 1.3 mm 2 to 6.0 mm 2 /s at 40 °C. Note 1: ASTM specification fuels falling within the scope of this test method are: Specification D396 Grades No 1 and 2; Specification D975 Grades 1-D, low sulfur 1-D and 2-D; Specification D2880 Grades 1-GT and 2-GT; Specification D6751 . 1.2 This test method is not applicable to fuels that contain free (undissolved) water (see 7.3 ). 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 evaluating the cleanliness of middle distillate fuels, and biodiesel and biodiesel blends for specifications and quality control purposes. 5.2 The filter media specified in the three procedures are all suitable for the materials in the Scope. Specifications calling up this test method should state the procedure required. 5.3 A change in filtration performance after storage or pretreatment can be indicative of changes of fuel condition. 5.4 The filterability of fuels varies depending on filter porosity and structure and therefore results from this test method might not correlate with full-scale filtration. 5.5 Causes of poor filterability in industrial/refinery filters include fuel degradation products, contaminants (including water) picked up during storage or transfer, effects due to temperature or composition for bio fuels, incompatibility of commingled fuels, or interaction of the fuel with the filter media. Any of these could correlate with orifice or filter system plugging, or both. 5.6 The results of the FBT test can range from 1 with a fuel with very good filterability, to over 100 for a fuel with poor filterability. The selection of a single FBT number to define a pass or fail criteria is not possible as this will be dependent on the fuel type and applications.