Natural gas. Determination of composition and associated uncertainty by gas chromatography -- Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons
This part of this International Standard describes a gas chromatographic method for the quantitative determination of the content of nitrogen, carbon dioxide and C1 to C5 hydrocarbons individually and a composite C6+ measurement, which represents all hydrocarbons of carbon number 6 and above in natural gas samples.
It is applicable to the analysis of gases containing constituents within the working ranges given in TableΒ 1.
TableΒ 1
Component working ranges
| Component | Β | Mole fraction % |
|
|---|---|---|---|
| Β | Β | Min. | Max. |
| Nitrogen | N2 | 0,1 | 22 |
| Carbon dioxide | CO2 | 0,05 | 15 |
| Methane | CH4 | 34 | 100 |
| Ethane | C2H6 | 0,1 | 23 |
| Propane | C3H8 | 0,05 | 10 |
| iso-Butane | i-C4H10 | 0,01 | 2,0 |
| n-Butane | n-C4H10 | 0,01 | 2,0 |
| neo-Pentane | neo-C5H12 | 0,005 | 0,35 |
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