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6.3.5 Operating mode "GC Ethane Analysis"
This mode is intended for determining if a gas sample is natural gas (NG) or liquefied
petroleum gas (LPG), by identifying the methane, ethane and propane content.
Natural gas (NG) typically contain at least 0.5 vol% of ethane in addition to a high
concentration of methane.
Liquefied petroleum gas (LPG) typically contain propane or butane or a mixture of the
two.
These differences are the basis for identifying gas type from an hydrocarbon analysis.
While significant ethane content (>0.5 Vol%) in a methane rich mixture is a certain
indication of natural gas, it is not entirely safe to say that no indication of ethane in a
methane rich mixture is a certain indication of swamp gas.
Some natural gas contains no or only traces of ethane.
This can be due to several reasons, for example:
• The gas source is solely or partly liquefied natural gas (LNG) which sometime has
very low ethane content.
• The gas source is solely or partly biogas.
• The natural gas source has very low ethane content.
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GC Ethane Analysis
Fig. 14: GC Ethane Analysis
Summary of Contents for 580-000
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