Spirit flow-x, Function Reference

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Flow-X─ Function Reference
4-111
Flow-X General functions - fxAPI_RD60F_1980
fxAPI_RD60F_1980
Relative Density (T, P) <--> Relative Density (60°F, equilibrium pressure)
This function converts a relative density value at the observed temperature and pressure to the relative
density at 60°F and the equilibrium pressure (typically 0 psig) or vice versa.
The temperature conversion is according to API-2540, Tables 23A/24A (Generalized Crude Oils) and
23B/24B (Refined Oil Products), while the volume correction for pressure according to API MPMS
11.2.1.
In 1982 API published tables 5D, 6D, 53D and 54D for lubricating oil products as part of API MPMS 11.1.
Although tables 23D and 24D are not covered in an official API standard the Flow-X series of flow
computer supports tables 23D and 24D as well by combining the calculation of tables 23A/B and 24A/B
with the K0 and K1 constants published in the other tables for lubricating oils.
Note: this function is a combination of API2540 and API 11.2.1. For the calculation from observed to
standard conditions an iterative calculation is required. The rounding and truncating of input and
intermediate values is implemented such that the example calculations as specified in both standards
are
exactly reproduced.
Compliance

API MPMS 11.1 Volume X (API Standard 2540) - Table 23A - Generalized Crude Oils,
Correction of Observed Relative Density to Relative Density at 60/60°F - First Edition, August
1980

API MPMS 11.1 Volume X (API Standard 2540) - Table 23B - Generalized Products,
Correction of Observed Relative Density to Relative Density at 60/60°F - First Edition, August
1980

API MPMS 11.1 Volume X (API Standard 2540) - Table 24A - Generalized Crude Oils,
Correction of Volume to 60°F against Relative Density at 60/60°F - First Edition, August 1980

API MPMS 11.1 Volume X (API Standard 2540) - Table 24B - Generalized Products Correction
of Volume to 60°F against Relative Density at 60/60°F - First Edition, August 1980

API MPMS 11.2.1 - Compressibility Factors for Hydrocarbons: 0 - 90°API Gravity Range - First
Edition, August 1984
Function inputs Remark EU SW tag Range Default
Name Optional tag name, tag
description and tag group
Input relative
density Depending on the conversion
method this is the relative
density either at the observed
temperature and observed
pressure or at 60
°
F and the
equilibrium pressure
- 0..1.3 0
Observed
temperature °F -
100..400 60
Observed pressure psig -
10..2000 0
Product 1: A - Crude Oil
2: B - Auto select
Selection based on relative
density at 60 °F
3: B - Gasoline
4: B - Transition Area
5: B - Jet Fuels PRDTYP - 1