Natural gas is comprised of a mixture of gases, being methane (CH4) predominant, usually in a concentration of about 90%.
The characteristics of natural gas are related to the concentration of its components, which must fall within specific tolerances established by regulation.
These tolerances are defined by a series of requisites, mainly:
The amount of energy inherent to a specific volume, Gross Calorific Value (GCV), which converts the metered volumes into energy supplied.
The adequacy of a combustible gas to a burning apparatus, defined by the Wobbe Index (WI) and the Specific Gravity (d).
The limitation of components whose excessive amount present may deteriorate equipment used in gas transport and processing, namely water concentration (dew point), hydrogen sulfide (H2S) and sulfur.
Other components which may influence the security and usage of natural gas.
The quality of natural gas transported and delivered by the RNTGN is controlled by real-time monitoring of the most relevant quality parameters (GCV, gravity, Wobbe Index and gas composition) through gas and sulfur chromatographs installed at specific points of the transmission network.