2-14
Flow-X─ Function Reference
Introduction - API Petroleum Measurement Tables
Applies for:
Table 5B
Table 6B
Table 23B
Table 24B
Table 53B
Table 54B
Table 5B
Table 6B
Table 23B
Table 24B
Table 53B
Table 54B
Range
API
Gravity
[°API]
Relative
Density
[-]
Density
[kg/m
3
]
Temperature
[°F]
Temperature
[°C]
Data Range
-10..45
0.8..1.165
800..1164
0 .. 300
-20..+150
Applies for:
Table 5D
Table 6D
Table 23D*
Table 24D*
Table 53D
Table 54D
Table 5D
Table 6D
Table 23D*
Table 24D*
Table 53D
Table 54D
* Values derived from Table 5D/6D
API-2540 - Rounding and truncating rules
For each table API Standard 2540 specifies an explicit 'Calculation Procedure' that includes the rounding
and truncating of all the input, intermediate and output values. The 'Calculation Procedure' is
considered to be the standard rather than the table values or a set of equations.
The function provides the option to either apply the full API rounding and truncating requirements or
to perform the calculation procedure without any rounding and truncating being applied.
For tables 6A, 6B, 24A, 24B and 54A and 54B the standard makes a distinction between computational
and table values for the calculated VCF. The table values are always rounded to 4 decimal places,
Whereas the computational values has 4 decimal places when the VFC >=1 and 5 decimal places when
the VCF < 1.
When API rounding is enabled the convergence limit is set to the limit value as specified in the
standard. When the API rounding is disabled the convergence limit is set to 0.00001 kg/m3 to obtain
highest precision.
API-11.1:2004 Limits
Range
Density
Temperature
Pressure
Crude Oil
610.6..1163.5 kg/m3 @ 60°F
100..-10 API @ 60°F
0.61120..1.16464 RD @ 60°F
611.16..1163.79 kg/m3 @ 15°C
606.12..1161.15 kg/m3 @ 20°C
-58..302 °F
-50..150 °C
0..1500 psig
0..103.4 bar(g)
Refined products
610.6..1163.5 kg/m3 @ 60°F
100..-10 API @ 60°F
0.61120..1.16464 RD @ 60°F
611.16..1163.86 kg/m3 @ 15°C
606.12..1160.62 kg/m3 @ 20°C
-58..302 °F
-50..150 °C
0..1500 psig
0..103.4 bar(g)
Lubricating oils
800.9..1163.5 kg/m3 @ 60°F
45..-10 API @ 60°F
0.80168..1.1646 RD @ 60°F
801.25..1163.85 kg/m3 @ 15°C
798.11..1160.71 kg/m3 @ 20°C
-58..302 °F
-50..150 °C
0..1500 psig
0..103.4 bar(g)
Содержание flow-x
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