What is the significance of oil viscosity testing?

In production, the refining depth of lubricating oil can be judged according to the change of viscosity. Generally: unrefined distillate viscosity > distillate refined with sulfuric acid viscosity > distillate refined with selective solvent viscosity.

1. Significance of viscosity to lubricating oil

Viscosity is an important indicator of lubricating oil quality, and it is also the correct choice of lubricating oil with a certain viscosity. It can further ensure the stable and reliable working state of the engine. As viscosity increases, engine power decreases and material consumption increases. If the number of years is too large, it will cause difficulty in starting; if the diameter is too small, it will reduce the supporting capacity of the oil film, so that a continuous lubricating layer cannot be maintained between the friction surfaces, thereby increasing wear. In product standards, most grades of lubricating oils are divided by the average value of kinematic viscosity. Such as: refrigerating machine oil, mechanical oil, etc., divided by the kinematics number whose average kinematic viscosity is 50 degrees; cylinder oil, gear oil, etc., according to the average centimeter resistance movement intensity at 100 °C. Viscosity is important for delivering lubricants. As the viscosity of the oil increases, the delivery pressure increases.

2. The importance of viscosity for jet fuel

The quality of fuel atomization is one of the important conditions for the normal operation of a jet engine. The viscosity of jet fuel has the greatest effect on the degree of fuel atomization. In order to ensure the required degree of atomization for jet engines at different temperatures, viscosity values ​​at different temperatures are specified in the fuel specifications.

3. Significance of viscosity to diesel

Viscosity is one of the important characteristics of diesel, which determines the atomization and combustion of diesel in internal combustion engines. If the viscosity is too high, the oil droplets sprayed from the nozzle are large and uneven, the atomization state is not good, the air mixing is not sufficient, and the combustion is not complete. At the same time, diesel oil will lubricate the plunger pump, and if the viscosity is too small, it will affect the lubrication of the pump and increase the wear of the plunger.