1.1 本试验方法包括测定残余燃料油的清洁度和残余燃料油与混合原料的相容性的单独程序。适用于粘度高达50 cSt（1 cSt=1 mm 2 s)在100℃下。该测试方法描述了两种方案:一种手动方案和一种自动方案。 附注1: 该测试方法尚未针对具有在滤纸上留下蜡沉积物的倾向且不含残留沥青质的重质馏分进行评估。 1.2 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。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 本测试方法中的四个程序可单独或组合使用，以识别可能导致离心机负荷过大、过滤器堵塞、罐污泥形成或类似操作问题的燃料或混合物。 5.2 通过清洁程序，成品燃料油的spot等级为3或更高表明燃料含有过量的悬浮固体，并可能导致操作问题。 5.3 尽管燃料在经受清洁度程序（手动和自动）时可以测试清洁度，但当燃料与混合原料混合时，悬浮固体可能会沉淀。在相容性程序（手动和自动）中，spot评级为3或更高，表明此类不相容性的证据。

1.1 This test method covers separate procedures for determining the cleanliness of residual fuel oil and the compatibility of a residual fuel oil with a blend stock. It is applicable to residual fuel oils with viscosities up to 50 cSt (1 cSt = 1 mm 2 s) at 100 °C. This test method describes two protocols: one manual and one automated. Note 1: This test method has not been evaluated for heavy distillate having the propensity to leave a wax sediment on the filter paper and contain no residual asphaltene. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 The four procedures in this test method are used alone or in combination to identify fuels or blends that could result in excessive centrifuge loading, strainer plugging, tank sludge formation, or similar operating problems. 5.2 A spot rating of Number 3 or higher on a finished fuel oil by the cleanliness procedure indicates that the fuel contains excessive suspended solids and is likely to cause operating problems. 5.3 Although a fuel may test clean when subjected to the cleanliness procedures (manual and automated), suspended solids can precipitate when the fuel is mixed with a blend stock. Evidence of such incompatibility is indicated by a spot rating of Number 3 or higher in the compatibility procedures (manual and automated).