ISO TR 19441:2018 pdf free

ISO TR 19441:2018 pdf free.Petroleum products – Density versus temperature relationships of current fuels, biofuels and biofuel components
It is common knowledge that the density of a product in its liquid phase depends mainly on product composition; temperature, due to extra- and intermolecular motion.
In addition, pressure can also affect density, but this effect was not investigated here because the changes caused by pressure are orders of magnitude smaller than those from temperature changes.
For trading and transport, the density-temperature function of a product is a very important product property for the determination of the product amount because the temperature of a liquid fuel can be as high as 50 °C, whereas, e.g. for tax reasons, almost all regulatory requirements demand that product densities are reported at a standard temperature of 15°C (or, like in the US, also at 60 °F) as a prediction using these density-temperature procedures.
The internationally accepted procedures for the determination and application of density and volume transformation from one temperature to another or to a standard temperature have been developed and standardized by the API and ASTM and are commonly referred to as the Petroleum Measurement Tables (PMT). These tables have been adopted by ISO (ISO 91) and by OIML by referring to ISO 91[14].
The tables and the procedures within them have been have been applied successfully and with satisfactory precision for more than 60 to 70 years and provide a standardized and accepted basis for trade[1][2][3][4].
NOTE 1 This report refers to the three latest version of the API tables, published in 1960, 1980 and 2000. The version from 2000 is a computer adoption of the 1980 version, including pressure correction.
It is evident that this success is mainly based on the existence of comparatively small compositional changes across a specific product family. The advent of biofuels and biofuel components like FAME (Fatty Acid Methyl Esters) in the market raised the question of whether the PMT tables could still be applied with acceptable precision for the predicted density at reference temperature. This question led to several series of FAME density measurements at different institutions in Germany, the UK and France, and probably also in many other countries.ISO TR 19441 pdf download.