Calculate viscosity index8/27/2023 ![]() ![]() It calculates the Viscosity Blend Index for each component, then sums up the product of each VBI and its weight fraction, and finally establishes the blend viscosity by using the formula for the Viscosity Blend Index in reverse. The Refutas equation, as proposed by British Petroleum is a three step algorithm. ![]() In order to calculate the resulting viscosity when blending two or more components together the following methods are popular ones in use: 1. This article focuses on the calculation of a blend viscosity of a fuel or lubrication oil mixture. A variety of methods and formulas exists to assists blending engineers in performing the necessary calculations for composing a specific blend, and sometimes the required specification of the end product calls not only for a specific viscosity but also for (a limit to) a certain flash point and / or pour point. ![]() One of the much researched topics in the petroleum industry is the topic of blending Fuel oils and lubrication oils are often blended from a variety of components to achieve a certain viscosity in the final product. ![]()
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