Flow-X─ Function Reference
4-93
Flow-X General functions - fxAPI_Gravity60F_1952
method
conditions
2: From standard to observed
conditions
SION
Function
outputs
Remark
EU
SW tag
Alarm
Fallback
Status
0: Normal
1: Input argument out of range
2: Calculation error
3: No convergence
-
STS
FIOOR
CALC
NOCONV
1
Output API
gravity
Depending of the conversion
method this represents the API
gravity at either at 60
°
F and the
equilibrium pressure or the
observed temperature and
pressure
°API
API
0
CTL
Volume correction factor for
temperature.
-
CTL
1
CPL
Volume correction factor for
pressure
Value will be rounded according to
input 'API 11.2.1 rounding'''
-
CPL
1
CTPL
Combined volume correction factor
CTPL = CTL * CPL
-
CTPL
1
F
Compressibility factor
-
F
0
CTL calc out of
range
With respect to the standard used
for the calculation of CTL the
combination of input values is:
0: In Range
1: Out of Range
CTLOOR
0
CPL calc out of
range
With respect to the standard used
for the calculation of CPL the
combination of input values is:
0: In Range
1: Out of Range
CPLOOR
0
Calculations
The calculations depend on the conversion method.
Conversion method 1: from observed to standard conditions.
The function performs the following iterative algorithm to calculate the API Gravity at standard
conditions:
1.
At the start of the iteration the initial value for API Gravity at [60
F, equilibrium
pressure] is set to the Observed API Gravity. The initial CPL value is set to 1.
2.
The CTL value is determined from the API Gravity at [60
F, equilibrium pressure]
according to API 1952 Table 6.
3.
The API Gravity at [60
F, equilibrium pressure] is calculated from the Observed
API gravity, the new CTL value and the CPL value from the previous iteration.
4.
Because API 11.2.1 requires the API gravity value at 60
F, the API gravity at [60
F, equilibrium pressure] is calculated from the API gravity at [60
F, equilibrium
pressure].
5.
The compressibility factor is calculated according to API MPMS 11.2.1 from the
API gravity at [60
F, equilibrium pressure] and the 'Observed temperature'. If API
11.2.1 rounding is enabled then the API gravity and temperature are rounded
and the calculations are performed in accordance with the rounding and
truncating rules of the standard.
Summary of Contents for flow-x
Page 1: ...Function Reference Certified flow calculations Flow and batch calculations Worksheet functions...
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