C250 – API MPMS 2004: Calculation of Cpl
Description
This calculates the correction factor due to pressure.
References
API MPMS Chapter 11.1 – Temperature and Pressure Volume Correction Factors for Generalized Crude Oils, Refined Products, and Lubricating Oils (ASTM D 1250-04; IP 200/04) (First edition 2004, Addendum 1 2007)
Kelton calculation reference C250
This calculation is used by:
F060/K214 – API Density Referral 2004
Options
Thermal Expansion Coefficient
- User Entered
Select this option if you know the thermal expansion factor at 60°F of the hydrocarbon you are performing calculations on. You will not need to select a commodity group if you select this option.
- Calculated
Select this option if you do not know the thermal expansion factor at 60°F of the hydrocarbon you are performing calculations on.
Commodity Group
- Crude Oil
- Fuel Oils
- Jet Fuels
- Transition Zone
- Gasoline
- Lubricating Oil
Select appropriate commodity so that the correct K values are used in the calculation. They are needed to calculate the thermal expansion factor of the liquid.
Constants
Constants as defined by API
| Commodity group | K0 | K1 | K2 |
| Crude oil | 341.0957 | 0 | 0 |
| Fuel oils | 103.8720 | 0.2701 | 0 |
| Jet fuels | 330.301 | 0 | 0 |
| Transition Zone | 1489.067 | 0 | -0.0018684 |
| Gasolines | 192.4571 | 0.2438 | 0 |
| Lubricating oil | 0 | 0.34878 | 0 |
Calculation
Scaled compressibility factor
The scaled compressibility factor, Fp (in psi-1), is calculated by:
| Where | ||
|---|---|---|
| Tf68 | = | Temperature shifted to ITPS-68 basis |
| ρf68 | = | Base density shifted to ITPS-68 basis |
Pressure correction factor
The pressure correction factor, Cpl, is calculated by:
| Where | ||
|---|---|---|
| Fp | = | Scaled compressibility Factor |
| P | = | Pressure |
| Pe | = | Vapour pressure |