Quantifying Natural Gas Constituents

With composition driving natural gas pricing, a traditional C1-C5 separation with C6+ backflush grouping is no longer sufficient to quantify BTU. The accurate identification of longer chain constituents, along with fixed gases and corrosive sulfur species, such as H2S, significantly improves gas value. While Gas chromatography (GC) is the method of choice for standard natural gas measurement, GC–mass spectrometry (GC-MS) is better suited for more challenging extended analyses. The powerful separation capability of GC-MS enables positive identification and quantification of hydrocarbons and impurities even in the most complex mixtures.   However, historically these instruments have seen limited deployment due to their size, complexity and the specialist maintenance required for continuous operation.

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A Ballistic Approach to GC-MS

The G908 natural gas analyzer integrates the speed and separating power of ballistic gas chromatography with ultra-compact, low maintenance and rugged high pressure mass spectrometer (HPMS). G908 quantifies C1-C12 hydrocarbons, fixed gases and contaminants in under 5 minutes. This 25lb integrated system includes HPMS, flame ionization (FID) and thermal conductivity (TCD) detection with valved sample introduction, column backflush and customizable results reporting – a complete solution for rapid natural gas analysis.

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