1.1 本规范（请参阅 注1 )涵盖了在各种气候和操作条件下用于各种类型燃油燃烧设备的燃油等级。这些等级描述如下: 1.1.1 等级1 S5000、1 S500、1 S15、2 S5000、2 S500和2 S15是用于家用和小型工业燃烧器的中间馏分燃料。1号S5000、1号S500和1号S15级特别适用于蒸发型燃烧器或储存条件需要低倾点燃料的情况。 1.1.2 B6-B20 S5000、B6-B20 S500和B6-B20 S15级是用于家用和小型工业燃烧器的中间馏分燃料/生物柴油混合物。 1.1.3 4号（轻质）和4号是用于该粘度范围的商业/工业燃烧器的重质馏分燃料或中间馏分/残余燃料混合物。 1.1.4 5号（轻）、5号（重）和6号是粘度和沸点范围不断增加的残余燃料，用于工业燃烧器。处理和适当雾化通常需要预热。 注1: 有关本规范中使用的术语和测试方法重要性的信息，请参阅 附录X1 . 注2: 有关燃油等级的更详细说明，请参阅 X1.3 . 1.2 本规范用于采购机构制定燃料油采购合同中包含的规范，并用于指导燃料油消费者选择最适合其需求的等级。 1.3 本规范中的任何内容均不得妨碍遵守联邦、州或地方法规，这些法规可能更具限制性。 1.4 以国际单位制表示的数值应视为标准。 1.4.1 表中提供了非国际单位制单位 1和表 2和英寸 7.1.2.1 / 7.1.2.2 因为这些是工业中常用的单元。 注3: 静电的产生和消散会在蒸馏燃烧器燃料油的处理中产生问题。有关该主题的更多信息，请参阅指南 D4865 . 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。

1.1 This specification (see Note 1 ) covers grades of fuel oil intended for use in various types of fuel-oil-burning equipment under various climatic and operating conditions. These grades are described as follows: 1.1.1 Grades No. 1 S5000, No. 1 S500, No. 1 S15, No. 2 S5000, No. 2 S500, and No. 2 S15 are middle distillate fuels for use in domestic and small industrial burners. Grades No. 1 S5000, No. 1 S500, and No. 1 S15 are particularly adapted to vaporizing type burners or where storage conditions require low pour point fuel. 1.1.2 Grades B6–B20 S5000, B6–B20 S500, and B6–B20 S15 are middle distillate fuel/biodiesel blends for use in domestic and small industrial burners. 1.1.3 Grades No. 4 (Light) and No. 4 are heavy distillate fuels or middle distillate/residual fuel blends used in commercial/industrial burners equipped for this viscosity range. 1.1.4 Grades No. 5 (Light), No. 5 (Heavy), and No. 6 are residual fuels of increasing viscosity and boiling range, used in industrial burners. Preheating is usually required for handling and proper atomization. Note 1: For information on the significance of the terminology and test methods used in this specification, see Appendix X1 . Note 2: A more detailed description of the grades of fuel oils is given in X1.3 . 1.2 This specification is for the use of purchasing agencies in formulating specifications to be included in contracts for purchases of fuel oils and for the guidance of consumers of fuel oils in the selection of the grades most suitable for their needs. 1.3 Nothing in this specification shall preclude observance of federal, state, or local regulations which can be more restrictive. 1.4 The values stated in SI units are to be regarded as standard. 1.4.1 Non-SI units are provided in Table 1 and Table 2 and in 7.1.2.1 / 7.1.2.2 because these are common units used in the industry. Note 3: The generation and dissipation of static electricity can create problems in the handling of distillate burner fuel oils. For more information on the subject, see Guide D4865 . 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.