In the oil inspection report, the routine inspection items of automobile gasoline and diesel include: density, distillation range, octane number, cetane number, diesel lubricity, polycyclic aromatic hydrocarbons, benzene content, oxygen content, sulfur content, moisture content and so on.
The evaporation characteristic temperature range from the initial distillation point to the final distillation point obtained by distillation of petroleum products under specific conditions. It is mainly used to judge the composition of light and heavy fractions of oil products and control the quality and performance of products.
The agreed value of fuel antiknock for spark ignition engine. In the standard engine test under specified conditions, it is determined by comparing with the standard fuel. It is expressed by the volume percentage of isooctane in standard fuel with the same anti-knock performance as the tested fuel. Different octane number determination methods will lead to different values, so when quoting octane number, the method adopted should be indicated.
Octane number is determined by using an experimental standard engine characterized by high mixture temperature (generally heated to 149℃) and high engine speed (generally up to 900 rpm).
Under specified conditions, petroleum products are heated to the lowest temperature when steam and flame of petroleum products contact and flash. The lighter the oil, the lower the flash point. The danger grade of oil products is classified according to the flash point. From the flash point, we can judge the weight of oil components and identify the danger of oil fire. The flash point measured by closed flash point tester is called closed flash point, which is generally used to determine light oil products. The higher the flash point, the safer it is.