ASTM D 1250-08. Temperature and Pressure Density Correction for Generalized Crude Oils, Refined Products, and Lubricating Oils
Metod to correct density from ...
metric base conditions to an alternate temperature and pressure (ch. 11.1.7.1)
metric observed conditions to metric base conditions (ch. 11.1.7.2)
observed metric conditions to alternate metric conditions (ch. 11.1.7.3)
Commodity group describing liquid
Refined Product
Crude Oil
Lube Oil
Observed temperature
°C
°F
Observed pressure
kPa
bar
psi
Observed density
kg/m
3
Base temperature
15 °С
20 °С
Base density (0 kPa (gauge))
kg/m
3
Alternate temperature
°C
°F
Alternate pressure
kPa
bar
psi
Density at base conditions
812.855568
kg/m
3
Input Data
Commodity ...................... Generalized Refined Product
T base temperature, °C ......... 15
t observed temperature, °C ..... 7
P observed pressure, psi ....... 0.0000000000
Observed density, kg/m
3
...... 818.7
Computed Data
Step 1 - Convert to customary units:
t observed temperature, °F ..... 44.6
T base temperature, °F ......... 59
Step 2 - Correcting observed density to 60 °F & 0 psi reference conditions:
Iteration(m) 0, (RefinedProducts)
Rho60(m) ........... 818.700000000000
K0(m) .............. 330.301000000000
K1(m) .............. 0.000000000000
K2(m) .............. 0.000000000000
A(m) ............... 0.000003387869
B(m) ............... 2.000000000000
Rho60*(m) .......... 818.702773641397
alpha60(m) ......... 0.000492784870
Ctl,60(m) .......... 1.007573259110
Fp(m) .............. 0.000000000000
Cpl,60(m) .......... 1.000000000000
Ctpl,60(m) ......... 1.007573259110
Rho60(m)xCtpl,60(m). 824.900227233240
d_alpha(m) ......... 2.0
E(m) ............... -6.153624242387
Dt(m) .............. -0.014993482134
Dp(m) .............. 0.000000000000
delta Rho(m) ....... -6.247292917127
Rho60(m+1) ......... 812.452707082873
Iteration(m) 1, (RefinedProducts)
Rho60(m) ........... 812.452707082873
K0(m) .............. 330.301000000000
K1(m) .............. 0.000000000000
K2(m) .............. 0.000000000000
A(m) ............... 0.000003440170
B(m) ............... 2.000000000000
Rho60*(m) .......... 812.455502051870
alpha60(m) ......... 0.000500392418
Ctl,60(m) .......... 1.007689895003
Fp(m) .............. 0.000000000000
Cpl,60(m) .......... 1.000000000000
Ctpl,60(m) ......... 1.007689895003
Rho60(m)xCtpl,60(m). 818.700383095038
d_alpha(m) ......... 2.0
E(m) ............... -0.000380171558
Dt(m) .............. -0.015222060536
Dp(m) .............. 0.000000000000
delta Rho(m) ....... -0.000386048004
Rho60(m+1) ......... 812.452321034868
Iteration(m) 2, (RefinedProducts)
Rho60(m) ........... 812.452321034868
K0(m) .............. 330.301000000000
K1(m) .............. 0.000000000000
K2(m) .............. 0.000000000000
A(m) ............... 0.000003440174
B(m) ............... 2.000000000000
Rho60*(m) .......... 812.455116005194
alpha60(m) ......... 0.000500392893
Ctl,60(m) .......... 1.007689902293
Fp(m) .............. 0.000000000000
Cpl,60(m) .......... 1.000000000000
Ctpl,60(m) ......... 1.007689902293
Rho60(m)xCtpl,60(m). 818.700000001486
Rho60 .......................... 812.452321034868
Ctl,60 ......................... 1.007689902293
Ctpl,60 ........................ 1.007689902293
Step 3 - Correct 60°F density to 15 °C base conditions:
t,°F ........................... 59.000000000000
t corrected to IPTS-68 °F ...... 59.006621316269
A .............................. 0.000003440174
B .............................. 2.000000000000
Rho60* ......................... 812.455116005194
alpha60 ........................ 0.000500392893
delta t, °F .................... -1.000253583731
Ctl* ........................... 1.000500447306
Fp,psi ......................... 0.000000000000
P in psi ....................... 0.000000000000
Cpl ............................ 1.000000000000
Ctpl* .......................... 1.000500447306
Step 4 - Modify Ctl* factor and calculate Ctpl factor for base temperature of 15°C:
Ctl ............................ 1.007185858844
Ctpl ........................... 1.007185858844
Ctpl, rounded .................. 1.00719
Step 5 - Density at base conditions:
Density, kg/m
3
................ 812.855568;