Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
15
6.1.4 Natural Gas
For natural gas of low caloric value the compressibility factor is calculated using the AGA-NX-19-mod equa-
tion. These factors are used with equations 4 to 8.
To calculate this compressibility factor following paramerters are to be entered in consideration of their limita-
tions.
Specific Gravity d
0.554 to 0.75
mol% CO
2
0 - 15%
mol% N
2
0 - 15%
Temperature and pressure must be within following ranges:
Temperature:
-40 bis 115°C
Pressure:
0 bis 137.9 bar
abs
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