Spirit flow-x, Function Reference

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Flow-X─ Function Reference
Flow-X General functions - fxAPI_MPMS_11_3_2_1
fxAPI_MPMS_11_3_2_1
Description
The function calculates the density of Ethylene (C2H4, also called Ethene) based on the API MPMS
11.3.2.1 Equation Of State in USC units. This API chapter is also known as API Standard 2565.
References

Supplement to API MPMS 11.3.1.1 (API Std. 1565) Ethylene Density, 1974, Reaffirmed 1993.
Boundaries
The equation of state is valid from 65…165 °F and 200 … 2100 psia.
Function inputs Remark EU Range Default
Name Optional tag name, tag description and tag
group
Temperature °F -100..300 0
Pressure psia 0…3000 0
API rounding 0: Disabled
The calculations are performed with full
precision. A convergence limit of 1e-10
lbm/ft3 will be applied for the iterative
calculations.
1: Enabled
The calculations are performed in full
compliance with the standard. The
input, intermediate and output values
are rounded as specified and also the
iteration limit as specified in the
standard is used to achieve
convergence.
- 1
Function outputs
Remark EU Fallback
Status 0: Normal
1: Input argument out of range
2: Calculation error
3: No convergence
Density
lb/ft3 0
Compressibility - 0
Equilibrium pressure Equilibrium pressure at the observed temperature.
This property is not currently calculated, as it is not
defined in the standard how to do this. psia 0
Range With respect to the standard the inputs are:
0: In Range
1: Out of Range - 0
Calculations
The calculations are in compliance with the standard.