1 Jul ASTM D Standard Practice for Viscosity-Temperature Charts for Liquid Petroleum Products. standard by ASTM International, 07/01/. Based on ASTM D equation: [(v+)=(T+)] Fuel Oil data from CIMAC ; Ignition Index from BS MA (log is base 10), In the. Scope ASTM Adjuncts: The kinematic viscosity-temperature charts (see Figs. 1 Adjunct D , Viscosity-Temperature Charts 1–73 and 2) covered by this .

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The conversion is based on a volume correction factor of 1, for ease of calculation. This test method details the standard procedure for plotting viscosity-temperature charts that ascertain the kinematic viscosity of a petroleum oil or liquid hydrocarbon at any temperature within a limited range, provided that the kinematic viscosities at two astn are known.

After entering all required data for the 1st component, select number 2 in the drop-down list, and fill in all necessary data for the second component, and so on for all components that you want to incorporate in the calculation.

There is a button in the right hand corner to clear any entries made ast. After selecting a component number, enter the required data in the various fields.

Conversely if you enter Mtons once you enter a density astk volume will be calculated and entered automatically. This abstract is a brief summary of the referenced standard.

Historical Version s – view previous versions of standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

To find out more, including how to control cookies, see here: Last night a new version of Oil Calculator Pro version 1. Calculate the blend viscosity using: The resulting viscosity, flash point, pour point and density will show up and update automatically as you enter data.


A tool to calculate the fractions of two components required to obtain a blend with a certain viscosity, based on the given viscosities of the two components. For each component the kinematic viscosity at two temperatures must be known. A tool to calculate blend viscosity, flash point, pour point and density based on a maximum of 10 components. The Refutas equation, as proposed by British Petroleum is a three step algorithm.

The last tool relies on a modified V50 formula, and is intended for fuel oils, and only for indicational purposes. 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 first method that will be discussed here is the calculation using the Refutas equation, since this is a very easy method to implement in an excel spreadsheet, or in a smartphone app, and it requires a minimum of known parameters.

Below picture shows the new Viscosity Blender tab top part. The first two tools use the Refutas equation to calculate blend viscosity and fractions. Download dropbox for free.

ASTM D – 17 Standard Practice for Viscosity-Temperature Charts for Liquid Petroleum Products

All entries up to 10 components are saved in a database as they are being entered and can be retrieved at any time. How to use the viscosity tools: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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. Next to the button there is a drop-down list with numbers 1 — 10, indicating each component. Let mass fraction 1 be X1 and mass fraction 2 be Atm it then follows that: The ast, here presented provide a significant improvement in linearity over the charts previously available under Method D — ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.


This increases the reliability of e341 to higher temperatures. Viscosity Blender — calculate fractions using two components. This article focuses on the calculation of a blend viscosity of a fuel or lubrication oil mixture.

Calculate the fraction of X1 and X2 for a quantity of MT, with viscosities of and cSt respectively, and a target viscosity of cSt: Also the settings screen has been slightly amended, so that the number of decimals chosen for Barrels is now also applied to Gallons.

In order to calculate the resulting viscosity when blending two or more components together the following methods are popular ones in use: The same is illustrated here with a picture of an example ASTM temperature chart: Finally and most importantly, three viscosity tools have been added to the app: This site uses cookies.

Monitoring of Oil Health with Accurate Viscosity Measurements

A tool to calculate the viscosity at a certain temperature, or the temperature corresponding to a certain viscosity, on the basis of a given viscosity at a reference temperature. Calculate the Viscosity Blend Number or Index for each component using the following formula: For an introductory video on youtube, here is a link: Link to Active This link will always route to the current Active version of the standard.

Once the two lines have been plotted, it is easy to construct either the blend viscosity based on the fractions used for each component, or construct the fractions for each component based on a target viscosity.