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Density of oil

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

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Created: 2013-11-04 11:22:56, Last updated: 2020-11-28 16:15:55
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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.

PLANETCALC, Density of oil

Density of oil

Digits after the decimal point: 3
Target density of oil, kg/m3
 
Density of oil at 15 deg C
 
Density of oil at 20 deg C
 
Coefficient of volumetric expansion at initial temperature
 
Compression coefficient at initial temperature
 
Coefficient of volumetric expansion at target temperature
 
Compression coefficient at target temperature
 

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}

The 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))}

The 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 an areometer is used, its readings are corrected using the 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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Timur2020-11-28 16:15:55

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