This converts density values between standard conditions (1.01325 bar and 60°F) and other observed or line conditions.
Kelton calculation reference C303
FLOCALC calculation reference F103
KIMS calculation reference K239
Ctl The correction for the pressure of the liquid is calculated using
(see C200 for calculation details)
“Report on the Development, Construction, Calculation and Preparation of the ASTM-IP Petroleum Measurement Tables (ASTM D 1250; IP 200)”: First edition 1960, Reprinted 1962 and 1968.
Cpl The correction for the temperature of the liquid is calculated using
(see C220for calculation details)
Measurement of Petroleum Measurement Standards Chapter 11.2.1 – Compressibility Factors for Hydrocarbons: 0-90° API Gravity Range (1984)
Measurement of Petroleum Measurement Standards Chapter 11.2.2 – Compressibility Factors for Hydrocarbons: 0.350-0.637 Relative Density (60°F/60°F) and -50°F to 140°F Metering Temperature (1986)
- Standard density
Calculate the standard density from the density at a given pressure and temperature
Calculate the density at a given pressure and temperature from the standard density
- Full precision
This enables you to bypass the rounding methods outlined in the algorithms and use the full precision during the calculation
Select this option to follow the algorithms to the in the standard
Automatically switch between the correct calculation for the range
- 350 to 637 kg/m³
Force the low density range to be used for the calculation.
- 638 to 1074 kg/m³
Force the high density range to be used for the calculation
This option allows the entry of the vapour equilibrium pressure, If this is not selected the value of 1 standard atmosphere (101325 Pa) is assumed.
When solving for density the temperature correction according to Table 24 is applied followed by the pressure correction according to API MPMS Chapter 11.2.1.
When solving for standard density an iterative calculation is performed making use of the Table 24 and API MPMS Chapter 11.2.1 algorithms. An initial estimate is taken for standard density based upon the entered density. This value is then fed into the Table 24 temperature correction algorithm to gain the Ctl. The estimate for standard density is then taken into the API 11.2.1 pressure correction algorithm to gain the Cpl. The Ctl and Cpl are then fed into the below formula to gain a new estimate of standard density. The process is repeated until standard density values converge to within 10-6.