1.1 本试验方法涵盖了测定中间馏分燃料油的增强过滤器堵塞趋势（EFBT）和可过滤性的程序。本试验适用于粘度范围为1.3的燃油 毫米 2. /s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页 1级和2级；规格 D975 1-D S15和S500级，以及2-D S15和S500级；规格 D2880 1级- GT和2-GT。 1.2 本试验方法仅具有临时重复性。有关更多信息，请参阅第节 12 . 1.3 本试验方法不适用于含有游离（未溶解）水的燃料（见 7.3 ). 1.4 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。 1.5 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。 1.6 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 本试验方法旨在评估中间馏出燃料的清洁度，以进行质量控制。 5.2 本程序中规定的过滤介质适用于范围内的材料。 5.3 储存或预处理后过滤性能的变化可能表明燃料状况的变化。 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全尺寸过滤无关；然而，该测试的结果可能有助于确定可缩短滤清器寿命的燃油。 5.5 工业/炼油厂过滤器可过滤性差的原因包括燃料降解产物、储存或转移过程中拾取的污染物（包括水）、柴油温度或成分的影响、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节流孔或过滤系统堵塞有关，或者两者都有。 5.6 EFBT测试的结果范围从1（对于过滤性非常好的燃油）到30（对于过滤性较差的燃油）。不可能选择单个EFBT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细节。因此，滤清器寿命和EFBT数之间的相关性取决于发动机设计和使用中的许多变量。 一些因素（如压力和所需的颗粒大小去除）来自燃油系统设计，而其他因素则是发动机部署的工作循环和环境的结果。例如，连续运行的大排量HPCR（高压共轨）发动机可能比偶尔使用的中型或轻型发动机需要更大的清洁度。在每种情况下，预期EFBT值可能不同。在第一个HPCR发动机示例中，燃油到达燃油系统之前的EFBT值<1.4可能是合适的，而EFBT<2。 0可能适用于中型/轻型发动机。在一项小型研究中，与试验方法相比，EFBT试验对燃料成分更敏感 D2068 方法( 附录X1 ).

1.1 This test method covers a procedure for the determination of the Enhanced Filter Blocking Tendency (EFBT) and the filterability of middle distillate fuel oils. This test is applicable to fuels within the viscosity range of 1.3 mm 2 /s 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 No. 1-D S15 and S500, and No. 2-D S15 and S500; Specification D2880 Grades No. 1-GT and No. 2-GT. 1.2 This test method has interim repeatability only. For more information, see Section 12 . 1.3 This test method is not applicable to fuels that contain free (undissolved) water (see 7.3 ). 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 ====== 5.1 This test method is intended for use in evaluating the cleanliness of middle distillate fuels for quality control purposes. 5.2 The filter media specified in this procedure is suitable for the materials in the scope. 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. Therefore, results from this test method might not correlate with full-scale filtration; however, results from this test might help identify fuels that can reduce filter life. 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 diesel, 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 EFBT test can range from 1 for a fuel with very good filterability, to over 30 for a fuel with poor filterability. The selection of a single EFBT number to define a pass or fail criteria is not possible, as this will be dependent on the fuel type and application specifics. The correlation between filter life and EFBT number is, therefore, dependent on many variables stemming from the design and use of the engine. Some factors like pressures and particle size removal required come from the fuel system design while others are a result of the duty cycle and environment where the engine is deployed. As an example, a large displacement HPCR (High-Pressure Common Rail) engine in continuous operation may have cleanliness needs much greater than that of a medium or light-duty engine in occasional use. In each case, the expected EFBT value may be different. An EFBT value of <1.4 for the fuel before it reaches the fuel system in the first example of HPCR engines may be suitable, while an EFBT <2.0 may be suitable in the medium/light-duty engines. In a small study, the EFBT test was shown to be more sensitive to constituents in the fuel than the Test Method D2068 method ( Appendix X1 ).