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Density of oil

Recalculation of 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. Density of oil. The tables for recalculation" standard
Timur2013-11-04 11:22:56

Recalculation of 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. Density of oil. The tables for recalculation" standard. Used formulas are listed below the calculator.

Density of oilCreative Commons Attribution/Share-Alike License 3.0 (Unported)
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Density of oil at given temperature and pressure \rho_{tP} is expressed via density of oil at 15 deg C and zero overpressure \rho_{15}

\rho_{tP}=\rho_{15}K_tK_P

K_t - temperature correction coefficient, calculated according to the formula

K_t=e^{-\alpha_{15}(t-15)(1+0.8\alpha_{15}(t-15))}

K_P - overpressure correction coefficient, calculated according to the formula

K_P=\frac{1}{1-\gamma_tP10^-3}

Density of oil at 20 deg C and zero overpressure is calculated according to the formula

\rho_{20}=\rho_{15}e^{-\alpha_{15}(20-15)(1+0.8\alpha_{15}(20-15))}

Coefficient of volumetric expansion at 15 deg C is calculated according to the formula

\alpha_{15}=\frac{K_0+K_1\rho_{15}}{\rho_{15}^2},

where K_0=613.97226, K_1=0

Coefficient of volumetric expansion at given temperature \alpha_{t} is calculated according to the formula

\alpha_{t}=\alpha_{15}+1.6\alpha_{15}^2(t-15)

Compression coefficient \gamma_{t} is calculated according to the formula

\gamma_t=10^{-3}e^{-1.62080+0.00021592t+\frac{0.87096*10^6}{\rho_{15}^2}+\frac{4.2092t*10^3}{\rho_{15}^2}}

If areometer is used, its readings are corrected using temperature correction coefficient for areometer glass. Thus, measured density is calculated as

\rho_t=\rho_{at}K,

where K=1-0.000025(t-t_g), t_g = 20, if areometer is graduated at 20 deg C and 15, if areometer is graduated at 15 deg C.

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