The viscometer’s self-cleaning design enables the refiner to operate without costly maintenance and re-calibration.” “In addition to being precise and dependable, Cambridge Viscosity viscometers are very small for ease of installation directly in-line or in bypass conditioning systems. You can easily compare viscosities and see how an oil's viscosity changes with temperature. We've compiled a list of oils from the major manufacturers to help your analysis. Viscosity is a measure of how thick an oil is, and is essential for proper machine lubrication. “Accurate, real time viscosity measurement enables this refiner to monitor and control the viscosity index of their premium base oils throughout manufacture, which improves product quality and refinery throughput,” says Cambridge Viscosity Engineering Manager Jon Lilley. Comparing Viscosity and Choosing the Right Industrial Oil. “We use two viscometers in each line to measure the lube oil at 40 ☌ and 100 ☌, so that we know the viscosity index real-time throughout the process.” “We tested the Cambridge Viscosity viscometers extensively and selected them for their accuracy, reliability and ease of installation and use,” says the chief engineer for the oil refinery company. Nonstandard units include the reyn, a British unit of dynamic viscosity. The viscosity index can be calculated using ASTM Method D2270, which calculates viscosity index by measuring the kinetic viscosity of liquids at 40 ☌ and 100 ☌. Kinematic viscosity has units of square feet per second (ft 2 /s) in both the BG and EE systems. Therefore, a 0W40 is better than a 10W40, since both offer the same viscosity (SAE40) at running temperature, but the SAE 0W will circulate more readily during a cold start than a SAE 10W. For example, traditional mineral oils have a viscosity index in the 95 - 100 range, while the VI of highly refined (hydrotreated) mineral oils typically go up to 120. As noted, Synthetics usually have a naturally higher viscosity index than even the artificially increased VI of mineral oils.
Incorporating VI measurement directly in their process lines allows this refiner real-time control in making premium products. To determine the viscosity index of engine oils, the kinematic viscosity is measured at 40☌ and 100☌, and these metrics are then compared to those of two reference oils. This International Standard describes two procedures for calculating the viscosity index (VI) of petroleum products and related materials, such as lubricating oils, from their kinematic viscosities at 40 ☌ and 100 ☌. Viscosity Index indicates how the oil viscosity changes with temperature, and is a critically important parameter in lubrication oil, as it is a primary indicator to characterize their behavior with respect to temperature. A leading worldwide maker of premium base oil for lubricants, based in the western United States, has standardized on Cambridge Viscosity process viscometers for all viscosity index (VI) refinery applications.
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