1.1 本试验方法包括在实验室或现场定量测量添加庚烷后在甲苯相中稀释的含沥青质重质燃油分离的难易程度。结果是可分离性数（%）。另见测试方法 D7061 . 1.2 试验方法仅限于含沥青质的重燃料油。ASTM规范-通常在本试验方法范围内的燃料为规范 D396页 ，4、5和6级，规范 D975 、4-D级和规范 D2880 ，等级3-GT和4-GT。制造此类混合燃料的炼油厂馏分也属于本试验方法的范围。 1.3 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。 1.4 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。 1.5 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 本程序描述了一种快速、灵敏的方法，用于估算石油的稳定储量。根据可分性数估计稳定储备，其中可分性数的低值表示油中存在稳定储备。 当可分性数在0到5之间时，可以认为石油具有较高的稳定性储备，沥青质不太可能絮凝。如果可分性数在5到10之间，则油中的稳定性储备将大大降低。然而，在这种情况下，只要油没有暴露在任何更恶劣的条件下，如储存、老化和加热，沥青质就不太可能絮凝。如果可分性数大于10，则油的稳定性储备非常低，沥青质将很容易絮凝，或者已经开始絮凝。 5.2 本试验方法适用于重油的炼油厂和用户，可用于估算其油的稳定性储量。因此，该测试方法可用于炼油厂控制和优化其炼油过程。 油类消费者可以使用本试验方法来估计其油类在储存之前、期间和之后的稳定性储备。 5.3 本试验方法不用于预测混合前油是否相容，但可用于确定已混合油的可分离数。然而，经验表明，与具有高可分性数的油相比，具有低可分性数的油更有可能与其他油相容。

1.1 This test method covers the quantitative measurement, either in the laboratory or in the field, of how easily asphaltene-containing heavy fuel oils diluted in toluene phase separate upon addition of heptane. The result is a separability number (%). See also Test Method D7061 . 1.2 The test method is limited to asphaltene-containing heavy fuel oils. ASTM specification fuels that generally fall within the scope of this test method are Specification D396 , Grade Nos. 4, 5, and 6, Specification D975 , Grade No. 4-D, and Specification D2880 , Grade Nos. 3-GT and 4-GT. Refinery fractions from which such blended fuels are made also fall within the scope of this test method. 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 procedure describes a rapid and sensitive method for estimating the stability reserve of an oil. The stability reserve is estimated in terms of a separability number, where a low value of the separability number indicates that there is a stability reserve within the oil. When the separability number is between 0 to 5, the oil can be considered to have a high stability reserve and asphaltenes are not likely to flocculate. If the separability number is between 5 to 10, the stability reserve in the oil will be much lower. However, asphaltenes are, in this case, not likely to flocculate as long as the oil is not exposed to any worse conditions, such as storing, aging, and heating. If the separability number is above 10, the stability reserve of the oil is very low and asphaltenes will easily flocculate, or have already started to flocculate. 5.2 This test method can be used by refiners and users of heavy oils, for which this test method is applicable, to estimate the stability reserves of their oils. Hence, this test method can be used by refineries to control and optimize their refinery processes. Consumers of oils can use this test method to estimate the stability reserve of their oils before, during, and after storage. 5.3 This test method is not intended for predicting whether oils are compatible before mixing, but can be used for determining the separability number of already blended oils. However, experience shows that oils exhibiting a low separability number are more likely to be compatible with other oils than are oils with high separability numbers.