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The recalculation of the density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements for the density of oil. The tables for recalculation" standard. Used formulas are listed below the calculator.
Density of oil at given temperature and pressure is expressed via density of oil at 15 deg C and zero overpressure
- temperature correction coefficient, calculated according to the formula
- overpressure correction coefficient, calculated according to the formula
The density of oil at 20 deg C and zero overpressure is calculated according to the formula
The coefficient of volumetric expansion at 15 deg C is calculated according to the formula
Coefficient of volumetric expansion at given temperature is calculated according to the formula
Compression coefficient is calculated according to the formula
If an areometer is used, its readings are corrected using the temperature correction coefficient for areometer glass. Thus, measured density is calculated as
where , = 20, if areometer is graduated at 20 deg C and 15, if areometer is graduated at 15 deg C.